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php – How to remove a polymorphic relation in Eloquent?

Posted by: admin July 12, 2020 Leave a comment

Questions:

I have a model like this:

<?php

class Post extends Eloquent {
    protected $fillable = [];


    public function photos()
    {
        return $this->morphMany('Upload', 'imageable');
    }

    public function attachments()
    {
        return $this->morphMany('Upload', 'attachable');
    }

}

and my morphMany table’s schema is like this:

CREATE TABLE `uploads` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`raw_name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`size` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`downloads` int(11) NOT NULL DEFAULT '0',
`imageable_id` int(11) DEFAULT NULL,
`imageable_type` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
`attachable_id` int(11) DEFAULT NULL,
`attachable_type` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
`user_id` int(10) unsigned NOT NULL,
`created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
PRIMARY KEY (`id`),
KEY `uploads_user_id_index` (`user_id`),
CONSTRAINT `uploads_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `posts` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=45 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

now I need to remove one row of this table, I tried $posts->photos()->delete(); but it removed all rows associated to this Post.

Could someone help me?

How to&Answers:

$posts->photos() is the relationship query to return all of the photos for a post. If you call delete() on that, it will delete all of those records. If you only want to delete a specific record, you need to make sure you only call delete on the one you want to delete. For example:

$posts->photos()->where('id', '=', 1)->delete();

Answer:

to reomove from pivot table in many to many polymorphic relation just use detach:

$posts->photos($photoModel)->detach();

Answer:

The relationship isn’t even needed for this. Just use the Upload model directly:

Upload::find($id)->delete();

Or even shorter:

Upload::destroy($id);

Answer:

I would use the detach method to remove the relationship like so:

$post = Post::find($id);
$post->photos()->detach();

Laravel docs explains this better