How to save in a polymorphic relationship in Laravel?

Question

I'm reading the tutorial* on how to define many-to-many polymorphic relationships in Laravel but it doesn't show how to save records with this relationship.

In the their example they have

class Post extends Model
{
    /**
     * Get all of the tags for the post.
     */
    public function tags()
    {
        return $this->morphToMany('App\Tag', 'taggable');
    }
}

and

class Tag extends Model
{
    /**
     * Get all of the posts that are assigned this tag.
     */
    public function posts()
    {
        return $this->morphedByMany('App\Post', 'taggable');
    }

    /**
     * Get all of the videos that are assigned this tag.
     */
    public function videos()
    {
        return $this->morphedByMany('App\Video', 'taggable');
    }
}

I've tried saving in different ways but the attempts that makes most sense to me is:

$tag = Tag::find(1);
$video = Video::find(1);
$tag->videos()->associate($video);

or

$tag->videos()->sync($video);

None of these are working. Can anyone give me a clue on what I could try?

https://laravel.com/docs/5.4/eloquent-relationships#many-to-many-polymorphic-relations

What's the error?

apokryfos
– apokryfos

2017-03-22 11:21:57 +00:00
Commented Mar 22, 2017 at 11:21 — apokryfos
– apokryfos, Commented Mar 22, 2017 at 11:21

João Mantovani · Accepted Answer · 2017-03-22 11:22:53Z

51

It's simple like that, see this section.

Instead of manually setting the attribute on the videos, you may insert the Comment directly from the relationship's save method:

//Create a new Tag instance (fill the array with your own database fields)
$tag = new Tag(['name' => 'Foo bar.']);

//Find the video to insert into a tag
$video = Video::find(1);

//In the tag relationship, save a new video
$tag->videos()->save($video);

answered Mar 22, 2017 at 11:22

João Mantovani

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5 Comments

João Mantovani Over a year ago

If it's not work, edit your post and explain your relationship for us

Dubby Over a year ago

Thank you. That fixed it. I was so close.

moses toh Over a year ago

@João Mantovani Seems you can help me. Look at this : stackoverflow.com/questions/49512956/…

llioor Over a year ago

@JoãoMantovani how it is possible that u have videos() relation on the tag() model if tag() is the polymorphic model with taggable() morphTo()?

Oussama Over a year ago

Instead of $tag->videos()->save($videos) do $video->tags()->save($tag) because the video model has many tags and setup morphTo in your video model.

Kurt Chun · Accepted Answer · 2020-01-20 07:28:05Z

25

you missed a step in the associate method, use this:

$tag->videos()->associate($video)->save();

answered Jan 20, 2020 at 7:28

Kurt Chun

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1 Comment

Sam Arjmandi Over a year ago

Only this one works for me

Andrew · Accepted Answer · 2021-06-14 14:54:09Z

2

You can also try this which worked for me (morphMany):

$rel_data = ['assigned_type'=>'User','assigned_id'=>$user_model->getKey()];

$event->assigned_models()->create($rel_data);

answered Jun 14, 2021 at 14:54

Andrew

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Comments

Ali Sharifi Neyestani · Accepted Answer · 2020-03-10 21:20:24Z

And if you want to save multi tags you can use code below

route:

Route::post('posts/{id}/tags', 'PostController@storeTags');

your request sends tags as array contains ids

+ Request (application/json) or (form-data)
        {
            "tags": [
              1,2,3,4
            ]
        }

in your controller:

public function storeTags(Request $request, $id)
{
    foreach ($request->tags as $id)
        $tags[] = Tag::find($id);

    $post= Post::find($id);
    $post->tags()->saveMany($tags);

}

and for update:

// sync() works with existing models' ids. [here means: $request->tags]
$post->tags()->sync([1,2,3]); // detaches all previous relations
$post->tags()->sync([1,2,3], false); // does not detach previous relations,attaches new ones skipping existing ids

showdev · Accepted Answer · 2021-01-24 23:24:39Z

0

I use this code:

$post->comments->attach($comment);

edited Jan 24, 2021 at 23:24

showdev

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answered Jan 23, 2021 at 20:17

رضا رحمتی - Reza Rahmati

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Comments

Sarthak Raval · Accepted Answer · 2021-09-09 06:11:17Z

0

Comment.php

class Comment extends Model
{
use HasFactory;
protected $fillable = ['body','comment_id','comment_type'];
public function commentable()
{
    return $this->morphTo();
}
}

MainController.php

 public function addPost(){
    //add Post
    //Create a new Tag instance (fill the array with your own database fields)
    $post = new Post(['post_name' => 'something post ']);
    
    //Find the comment to insert into a post
    $comment =  Comment::find(1);

    //In the comment relationship, save a new post
    $post->save();
    return ("Post Added");
    }

web.php

Route::get('/add-post',[MainController::class,'addPost']);

https://laravel.com/docs/5.4/eloquent-relationships#inserting-and-updating-related-models

edited Sep 9, 2021 at 6:11

answered Sep 9, 2021 at 6:05

Sarthak Raval

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Comments

Mohd Anas · Accepted Answer · 2022-03-11 12:34:12Z

0

$post = Post::create([
  'title' => 'test title',
  'description' => 'test description',
  'status' => 1,
  ]);

$post->comment()->create([ 'body' => "test body",'user_id' => 1]);

answered Mar 11, 2022 at 12:34

Mohd Anas

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