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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace EloquentJs\Laravel\Model;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Carbon\Carbon;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use DateTime;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use InvalidArgumentException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use EloquentJs\Laravel\Events\EloquentJsWasCalled;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use UnexpectedValueException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                trait EloquentJsQueries  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Scope to results that satisfy the string-encoded list of query methods described by $stack.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Illuminate\Database\Eloquent\Builder $query  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $stack  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function scopeUseEloquentJs($query, $stack = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ( ! static::$dispatcher) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new UnexpectedValueException(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Event dispatcher not found. Install illuminate/events package for EloquentJS usage without Laravel.'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        static::$dispatcher->fire(new EloquentJsWasCalled($query, $stack));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Handle dynamic calls to scope methods.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Yes, this is indeed a scope for calling another scope method.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * While there are other ways we could support scopes, this has  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * the benefit of requiring no special treatment in our BaseQueryTranslator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * - no different from how we handle `where`, `orderBy`, etc.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Illuminate\Database\Eloquent\Builder $query  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $name  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $parameters  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function scopeScope($query, $name, $parameters = [])  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $methodName = 'scope'.ucfirst($name);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ( ! method_exists($this, $methodName)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new InvalidArgumentException("No such scope [$name]"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        array_unshift($parameters, $query);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        call_user_func_array([$this, $methodName], $parameters);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Prepare a date for array / JSON serialization.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Overrides the date serializer to ensure our Javascript can  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * understand the format.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @todo  implement date handling without global side effects  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param DateTime $date  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function serializeDate(DateTime $date)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $date->toIso8601String();  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Return a timestamp as DateTime object.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Accept dates from Javascript in any format that Carbon recognises.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  string $value  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Carbon  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function asDateTime($value)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (is_string($value)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return Carbon::parse($value);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return parent::asDateTime($value);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get the endpoint defined on this model.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string|null  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getEndpoint()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (property_exists($this, 'endpoint')) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->endpoint;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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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: