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<?php |
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namespace Luminark\Url\Traits; |
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use Luminark\Url\Models\Url; |
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trait HasUrlTrait |
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{ |
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/** |
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* Temporary internal variable for updated URI. |
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* |
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* @var string |
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*/ |
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protected $_uri = false; |
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/** |
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* Url object representing the URL which points to this resource. |
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* |
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* @return Illuminate\Database\Eloquent\Relations\MorphOne |
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*/ |
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public function url() |
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{ |
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return $this->morphOne($this->getUrlClass(), 'resource'); |
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} |
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/** |
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* Overrides Eloquent Model's default attribute getting and gets |
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* the currently set URI. |
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* |
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* @return string|null URI |
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*/ |
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public function getUriAttribute() |
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{ |
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return $this->_uri === false |
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? ($this->url ? $this->url->uri : null) |
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: $this->_uri; |
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} |
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/** |
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* Overrides Eloquent Model's default attribute setting to store the URI |
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* in memory only. Override this method if you need to have |
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* the URI stored as model attribute in the database. |
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*/ |
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public function setUriAttribute($uri) |
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{ |
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$this->_uri = $uri === false ? null : $uri; |
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} |
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/** |
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* Saves the URI and related URL object for the model. |
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* |
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* @return Luminark\Url\Interfaces\HasUrlInterface URL resource object |
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*/ |
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public function saveUri($uri = null) |
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{ |
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$urlClass = $this->getUrlClass(); |
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$originalUrl = $this->url; |
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$uri = $uri ?: $this->uri; |
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if ( ! is_null($uri)) { |
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$uri = $this->prepareUri($uri); |
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$this->validateUri($uri); |
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} |
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// Check if this resource object is already associated with a Url object |
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if ( ! $originalUrl && ! is_null($uri)) { |
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// Associate a new Url object with current resource object |
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$url = $urlClass::create(['uri' => $uri]); |
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$url->resource()->associate($this); |
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$url->save(); |
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// Dissociate content from URL if uri set to null |
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} elseif (is_null($uri)) { |
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$originalUrl->resource()->dissociate(); |
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$originalUrl->delete(); |
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$this->url = null; |
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// Redirect old Url object to new Url object |
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} elseif ($originalUrl && $originalUrl->uri !== $uri) { |
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$originalUrl->resource()->dissociate(); |
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$originalUrl->save(); |
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$newUrl = $urlClass::firstOrCreate(['uri' => $uri]); |
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$this->redirectUrl($originalUrl, $newUrl); |
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$newUrl->resource()->associate($this); |
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$newUrl->save(); |
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} |
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// Refresh the model with updated URL object |
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$this->load('url'); |
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return $this; |
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} |
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/** |
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* Gets the class for URL object needed to define Eloquent relationship |
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* between resource and URL models. Override this method if Url class |
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* is being extended. |
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* |
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* @return string Url class |
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*/ |
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protected function getUrlClass() |
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{ |
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return Url::class; |
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} |
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/** |
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* Transforms URI value as required before storing it. |
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* |
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* @return string Transformed URI value |
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*/ |
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protected function prepareUri($uri) |
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{ |
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// Remove starting and trailing slash from URI |
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$uri = preg_replace('/\/$/', '', $uri); |
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$uri = preg_replace('/^\//', '', $uri); |
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$uri = strtolower($uri); |
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return $uri; |
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} |
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/** |
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* Validates the URL value and makes sure it is unique. Override this |
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* method if custom validation is needed. |
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* |
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* @return boolean URI validity status |
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*/ |
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protected function validateUri($uri) |
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{ |
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$urlClass = $this->getUrlClass(); |
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$url = $urlClass::find($uri); |
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return $url ? false : true; |
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} |
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/** |
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* Modifies the $originalUrl to redirect to $newUrl. |
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* |
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* @param Url $originalUrl The URL that will be redirecting |
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* @param Url $newUrl The URL that will be redirected to |
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*/ |
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protected function redirectUrl(Url $originalUrl, Url $newUrl) |
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{ |
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$newUrl->redirectsTo()->dissociate(); |
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$newUrl->save(); |
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$originalUrl->redirectsTo()->associate($newUrl); |
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$originalUrl->save(); |
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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.