Check if relations are loaded on Eloquent Model
Submitted by chadwithuhc - 10 years ago
I've used this technique to check if I have called any `->with()` or other relations loaded on a model. I had a need for this since I have a lot of methods that require relation data in order to generate an appended property on the model. For example, if I want to pull all of the recent Posts of an Author and I want to store it on the model as `posts_this_month`, I would need to have Posts relation loaded. I want to force myself to eager load that data before I try to access it, otherwise I could run into an n+1 problem.
// Author Model Methods and Properties
// Appended attributes
protected $appends = array('posts_this_month');
/**
* Attribute mutator
*/
public function getPostsThisMonthAttribute() {
// Cancel if we have not retrieved Posts already
if (!$this->isPostsLoaded()) {
return null;
}
// Calculate Posts this month
$posts_this_month = $this->posts->getPostsThisMonth();
return $this->attributes['posts_this_month'] = $posts_this_month;
}
/**
* Determine if we've already loaded the Posts
* Used to prevent lazy loading on Posts, we always want to force eager or triggered loading
* @return bool
*/
public function isPostsLoaded() {
return isset($this->relations['posts']);
}
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