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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace SpeckCatalog\Service;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SpeckCatalog\Model\AbstractModel;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class ProductUom extends AbstractService  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $entityMapper = 'speckcatalog_product_uom_mapper';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $availabilityService;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $uomService;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $productService;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function getByProductId($productId, $populate = false, $recursive = false)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $productUoms = $this->getEntityMapper()->getByProductId($productId);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($populate) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            foreach ($productUoms as $productUom) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $this->populate($productUom, $recursive);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $productUoms;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function cheapestUom(array $uoms)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $lowest = null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($uoms as $uom) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (!$lowest) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $lowest = $uom;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($uom->getPrice() < $lowest->getPrice()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $lowest = $uom;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $lowest;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                                                                
            
                                    
            
            
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                    public function populate($productUom, $recursive = false, $children = true)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $allChildren = ($children === true) ? true : false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $children    = (is_array($children)) ? $children : array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($allChildren || in_array('availabilities', $children)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $availabilities = $this->getAvailabilityService()->getByProductUom(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $productUom->getProductId(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $productUom->getUomCode(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $productUom->getQuantity()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($recursive) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                foreach ($availabilities as $i => $avail) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $this->getAvailabilityService()->populate($avail);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $productUom->setAvailabilities($availabilities);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($allChildren || in_array('uom', $children)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $uom = $this->getUomService()->find(array('uom_code' => $productUom->getUomCode())); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $productUom->setUom($uom);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return availabilityService  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getAvailabilityService()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (null === $this->availabilityService) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->availabilityService = $this->getServiceLocator()->get('speckcatalog_availability_service'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->availabilityService;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param $availabilityService  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return self  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function setAvailabilityService($availabilityService)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->availabilityService = $availabilityService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return uomService  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getUomService()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (null === $this->uomService) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->uomService = $this->getServiceLocator()->get('speckcatalog_uom_service'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->uomService;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param $uomService  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return self  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function setUomService($uomService)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->uomService = $uomService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function update($data, array $where = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $vars = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'data'        => $data,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'where'       => $where,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getEventManager()->trigger('update.pre', $this, $vars); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $result = parent::update($data, $where);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $vars['result'] = $result;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getEventManager()->trigger('update.post', $this, $vars); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $result;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function insert($productUom)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($productUom instanceof AbstractModel) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $data = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'uom_code' => $productUom->getUomCode(),  | 
            
                            
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                                'product_id' => $productUom->getProductId(),  | 
            
                            
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                                'quantity' => $productUom->getQuantity(),  | 
            
                            
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                             1                          | 
                
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } elseif (is_array($productUom)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $data = $productUom;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    134
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                        $vars = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                             2                          | 
                
                 | 
                            'data' => $data,  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                             2                          | 
                
                 | 
                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                             2                          | 
                
                 | 
                        $this->getEventManager()->trigger('insert.pre', $this, $vars); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                             2                          | 
                
                 | 
                        $vars['result'] = parent::insert($productUom);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                             2                          | 
                
                 | 
                        $this->getEventManager()->trigger('insert.post', $this, $vars); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                             2                          | 
                
                 | 
                        $productUom = $this->find($data);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                             2                          | 
                
                 | 
                        return $productUom;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                     * @return productService  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                    public function getProductService()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                        if (null === $this->productService) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
                                                     | 
                
                 | 
                            $this->productService = $this->getServiceLocator()->get('speckcatalog_product_service'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                                                     | 
                
                 | 
                        return $this->productService;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    157
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                     * @param $productService  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                     * @return self  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                                                     | 
                
                 | 
                    public function setProductService($productService)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                                                     | 
                
                 | 
                        $this->productService = $productService;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                        return $this;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    167
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    169
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different sub-classes of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the parent class: