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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Spatie\Sluggable;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Database\Eloquent\Model;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                trait HasSlug  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var \Spatie\Sluggable\SlugOptions  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $slugOptions;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get the options for generating the slug.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    abstract public function getSlugOptions() : SlugOptions;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Boot the trait.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected static function bootHasSlug()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        static::creating(function (Model $model) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $model->addSlug();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        });  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        static::updating(function (Model $model) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $model->addSlug();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        });  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Add the slug to the model.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function addSlug()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->slugOptions = $this->getSlugOptions();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->guardAgainstInvalidSlugOptions();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $slug = $this->generateNonUniqueSlug();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->slugOptions->generateUniqueSlugs) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $slug = $this->makeSlugUnique($slug);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $slugField = $this->slugOptions->slugField;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->$slugField = $slug;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Generate a non unique slug for this record.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function generateNonUniqueSlug() :  string  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($this->hasCustomSlugBeenUsed()) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $slugField = $this->slugOptions->slugField;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return $this->$slugField;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return str_slug($this->getSlugSourceString());  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Determine if a custom slug has been saved.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function hasCustomSlugBeenUsed() : bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $slugField = $this->slugOptions->slugField;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getOriginal($slugField) != $this->$slugField;  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get the string that should be used as base for the slug.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getSlugSourceString() : string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $slugSourceString = collect($this->slugOptions->generateSlugFrom)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->map(function (string $fieldName) : string { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return $this->$fieldName ?? '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            })  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->implode('-'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return substr($slugSourceString, 0, $this->slugOptions->maximumLength);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Make the given slug unique.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function makeSlugUnique(string $slug) : string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $originalSlug = $slug;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $i = 1;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        while ($this->otherRecordExistsWithSlug($slug) || $slug === '') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $slug = $originalSlug.'-'.$i++;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $slug;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Determine if a record exists with the given slug.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function otherRecordExistsWithSlug(string $slug) : bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return (bool) static::where($this->slugOptions->slugField, $slug)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->where($this->getKeyName(), '!=', $this->getKey() ?? '0')  | 
            
                            
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                            ->first();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * This function will throw an exception when any of the options is missing or invalid.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function guardAgainstInvalidSlugOptions()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!count($this->slugOptions->generateSlugFrom)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw InvalidOption::missingFromField();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!strlen($this->slugOptions->slugField)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw InvalidOption::missingSlugField();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->slugOptions->maximumLength <= 0) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw InvalidOption::invalidMaximumLength();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.