Fetch results based on the existence/absence of the MorphTo relationships in Laravel
To query the existence of MorphTo relationships, you may use the whereHasMorph, whereDoesntHaveMorph methods and its corresponding methods:
Retrieve comments associated to posts or videos with a title like foo%...
$comments = App\Models\Comment::whereHasMorph(
'commentable',
['App\Models\Post', 'App\Models\Video'],
function (Builder $query) {
$query->where('title', 'like', 'foo%');
}
)->get();
Retrieve comments associated to posts with a title not like foo%...
$comments = App\Models\Comment::whereDoesntHaveMorph(
'commentable',
'App\Models\Post',
function (Builder $query) {
$query->where('title', 'like', 'foo%');
}
)->get();
You may use the $type parameter to add different constraints depending on the related model:
use Illuminate\Database\Eloquent\Builder;
$comments = App\Models\Comment::whereHasMorph(
'commentable',
['App\Models\Post', 'App\Models\Video'],
function (Builder $query, $type) {
$query->where('title', 'like', 'foo%');
if ($type === 'App\Models\Post') {
$query->orWhere('content', 'like', 'foo%');
}
}
)->get();
Instead of passing an array of possible polymorphic models, you may provide * as a wildcard and let Laravel retrieve all the possible polymorphic types from the database.
Laravel will execute an additional query in order to perform this operation:
use Illuminate\Database\Eloquent\Builder;
$comments = App\Models\Comment::whereHasMorph('commentable', '*', function (Builder $query) {
$query->where('title', 'like', 'foo%');
})->get();
