CakePHP 3.0 Can't save hasMany associated data

Question

I've problem when saving data with hasMany association

This is my table

1) post table: each item has an unique id.

id | title | ... 
1  | Aloha | ...

2) images table

id | post_id | image   | ...  
1  | 1       | abc.jpg | ...
2  | 1       | efg.jpg | ...

My Model (Table)

Posts Model

// PostsTable.php
<?php

namespace App\Model\Table;

use Cake\ORM\Query;
use Cake\ORM\Table;
use Cake\Validation\Validator;

class PostsTable extends Table {
     public function initialize(array $config) {
        $this->table('posts');
        $this->displayField('title');
        $this->primaryKey('id');
        $this->addBehavior('Timestamp');
        $this->hasMany('Images', [
           'foreignKey' => 'id'
        ]);
     }
}

...

Images Model

// ImagesTable.php
<?php

namespace App\Model\Table;

use Cake\ORM\Query;
use Cake\ORM\Table;
use Cake\Validation\Validator;

class ImagesTable extends Table {
     public function initialize(array $config) {
        $this->table('images');
        $this->displayField('id');
        $this->primaryKey('id');
        $this->addBehavior('Timestamp');
        $this->belongsTo('Posts');
     }
}

...

My Controller

// PostsController.php
...
public function add() {
    $post = $this->Posts->newEntity($this->request->data, [
        'associated' => ['Images']
    ]);

    if ($this->request->is('post')) {
        if ($this->Posts->save($post, ['associated' => ['Images']])) {
            $this->Flash->success('The post has been saved.');
            return $this->redirect(['action' => 'index']);
        } else {
            $this->Flash->error('The post could not be saved. Please, try again.');
        }
    }

    $this->set('post', $post);
}

...

My Template

// add.ctp
<?= $this->Form->create($post); ?>

<?php echo $this->Form->input('title'); ?>

<?php echo $this->Form->input('images.0.image'); ?>
<?php echo $this->Form->input('images.1.image'); ?>
<?php echo $this->Form->input('images.2.image'); ?>

<?= $this->Form->button(__('Submit'), ['class' => 'button-green']) ?> 

<?= $this->Form->end() ?>

Input array result Debug

[
   'title' => 'Hello',
   'images' => [
       (int) 0 => [
           'image' => 'testa.jpeg'
       ],
       (int) 1 => [
           'image' => 'testb.jpeg'
       ],
       (int) 2 => [
           'image' => 'testc.jpeg'
       ]
   ]
]

(Update) debug($post)

object(App\Model\Entity\Story) {

    'new' => true,
    'accessible' => [
        'title' => true,
        'images' => true
    ],
    'properties' => [
        'title' => 'Hello',
        'images' => [
            (int) 0 => object(App\Model\Entity\Image) {

                'new' => true,
                'accessible' => [
                    'post_id' => true,
                    'image' => true,
                    'post' => true
                ],
                'properties' => [
                    'image' => 'testa.jpeg'
                ],
                'dirty' => [
                    'image' => true
                ],
                'original' => [],
                'virtual' => [],
                'errors' => [],
                'repository' => 'Images'

            },
            (int) 1 => object(App\Model\Entity\Image) {

                'new' => true,
                'accessible' => [
                    'post_id' => true,
                    'image' => true,
                    'post' => true
                ],
                'properties' => [
                   'image' => 'testb.jpeg'
                ],
                'dirty' => [
                    'image' => true
                ],
                'original' => [],
                'virtual' => [],
                'errors' => [],
                'repository' => 'Images'

            },
            (int) 2 => object(App\Model\Entity\Image) {

                'new' => true,
                'accessible' => [
                    'post_id' => true,
                    'image' => true,
                    'post' => true
                ],
                'properties' => [
                    'image' => 'testc.jpeg'
                ],
                'dirty' => [
                    'image' => true
                ],
                'original' => [],
                'virtual' => [],
                'errors' => [],
                'repository' => 'Images'

            }
        ]
    ],
    'dirty' => [
        'title' => true,
        'images' => true
    ],
    'original' => [],
    'virtual' => [],
    'errors' => [],
    'repository' => 'Stories'

}

I can't figure out what I am doing wrong

Thanks

Answer 1

I haven't looked everything, but I saw there is an error in your association declaration:

$this->hasMany('Images', [
    'foreignKey' => 'id'
]);

The docs say:

foreignKey: the name of the foreign key found in the other model. This is especially handy if you need to define multiple hasMany relationships. The default value for this key is the underscored, singular name of the actual model, suffixed with ‘_id’.

So it should be:

$this->hasMany('Images', [
    'foreignKey' => 'post_id'
]);

or even:

$this->hasMany('Images');