Backpack 4.1 HasMany relation

App\Http\Controllers\PostCrudController

  <?php

namespace App\Http\Controllers;

use Backpack\CRUD\app\Http\Controllers\CrudController;
use Backpack\CRUD\app\Library\CrudPanel\CrudPanelFacade as CRUD;

class PostCrudController extends CrudController
{
    use \Backpack\CRUD\app\Http\Controllers\Operations\CreateOperation { store as traitStore; } //IMPORTANT HERE
    use \Backpack\CRUD\app\Http\Controllers\Operations\UpdateOperation { update as traitUpdate; } //IMPORTANT HERE
    
    public function setup()
    {
        CRUD::setModel(\App\Models\Post::class);
        CRUD::setRoute(config('backpack.base.route_prefix') . '/post');
        CRUD::setEntityNameStrings('post', 'posts');
    }

    protected function setupCreateOperation()
    {
        CRUD::field('post_title');
        CRUD::field('post_body');

        CRUD::field('comments_list')
            ->type('repeatable')
            ->label('Comments')
            ->fields([
                [
                    'name'    => 'id',
                    'type'    => 'hidden',
                ],
                [
                    'name'    => 'comment_text',
                    'type'    => 'text',
                ],
            ]);
    }

    protected function setupUpdateOperation()
    {
        $this->setupCreateOperation();
    }

    public function store()
    {
        $items = collect(json_decode(request('comments_list'), true));

        // create the main item as usual
        $response = $this->traitStore();

        // instead of returning, take a little time to create the post comments too
        $post_id = $this->crud->entry->id;
        
        
        // add the post_id to the items collection
        $items->each(function($item, $key) use ($post_id) {
            $item['post_id'] = $post_id;     
            \App\Models\Comment::create($item);
        });

        return $response;
    };

    public function update()
    {
        $items = collect(json_decode(request('comments_list'), true));

        $response = $this->traitUpdate();

        // instead of returning, take a little time to update the post comments too
        $post_id = $this->crud->entry->id;
        $created_ids = [];

        $items->each(function($item, $key) use ($post_id, &$created_ids) {
            $item['post_id'] = $post_id;

            if ($item['id']) {
                $comment = \App\Models\Comment::find($item['id']);
                $comment->update($item);
            } else {
                
               $created_ids[] = \App\Models\Comment::create($item)->id;
                
            }

        });
        
        // delete removed Comments
        $related_items_in_request = collect(array_merge($items->where('id', '!=', '')->pluck('id')->toArray(), $created_ids));
        $related_items_in_db = $this->crud->entry->comments;
        
        $related_items_in_db->each(function($item, $key) use ($related_items_in_request) {
            if (!$related_items_in_request->contains($item['id'])) {
                $item->delete();
            }
        });

        return $response;
    }

App\Models\Comment

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    use \Backpack\CRUD\app\Models\Traits\CrudTrait;
    
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'post_id',
        'comment_text',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'id' => 'integer',
        'post_id' => 'integer',
    ];


    public function post()
    {
        return $this->belongsTo(\App\Models\Post::class);
    }
}

App\Models\Post

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    use \Backpack\CRUD\app\Models\Traits\CrudTrait;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'post_title',
        'post_body',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'id' => 'integer',
    ];

    public function comments()
    {
        return $this->hasMany(\App\Models\Comment::class);
    }
    
    //acessor to get the comments populated in the repeatable field again
    public function getCommentsListAttribute() {
        return json_encode($this->comments);
    }
}

https://gist.github.com/pxpm/d584a109037d3efc7519872ac2096334#file-app-http-controllers-postcrudcontroller-L53

Good day! On this line I get error "Trying to get property 'id' of non-object". Have solutions?

Hi, I've followed this example and it works fine. It also improves de UX since the user doesn't need to navigate to the child element panel but I'm having some major issue:

I'm using SpatieTranslatable\HasTranslations from backpack and using this solution I get the [Object object ] value on the repeatable fields.

is there a way to parse the fields when defining the crud field?
thanks

Hi !
Thanks for the example, this is great !

Only detail for me here is that this example doesn't fully take order into account (try to update a post by just reordering it's comments for exemple, you will see what I mean).
Here is a suggestion for those who need to be strict with order: simply don't put the hidden ID in the repeated fields. This way ALL items will be treated as creation and ALL previous items will be deleted (just keep in mind that the ID's will be changed, and there may be reasons why you wouldn't want that behaviour).

Also, if you wan't to keep your code as short as possible and don't care about dispatching deletion events, maybe you can delete the extra relation items this way ? (seems to work fine on my side):

// delete removed comments
$related_items_in_request = collect(array_merge($items->where('id', '!=', '')->pluck('id')->toArray(), $created_ids));
// Shorter way to handle the deletion, however keep in mind that this does not dispatch deletion events
Comment::where('post_id', '=', $post_id)->whereNotIn('id', $related_items_in_request)->delete();

@joseprigo Hi, I'm facing the same problem have you found any solution?
cheers

for everyone in the same situation I found a solution, force the language at the beginning of the setupCreateOperation() function:

app()->setlocale(request('locale')?:'en');