Update to value in _joinData works but misses right index - cakephp

Question

I'm finally finding out how to update a join table after a lot of work, but I found something that I definitely cannot solve. I added manually a set of checkboxes to update an item on my join table and work almost perfectly, as long as they're part of my legacy database. When I add new items to the join table with lower id, then the wrong item on my join table is updated.
Here is how I have my controller:
public function edit($id)
{
$brigada = $this->Brigadas
->findById($id)
->contain(['Tags', 'Voluntarios'])
->firstOrFail();
if ($this->request->is(['patch', 'post', 'put'])) {
// https://github.com/cakephp/cakephp/issues/7864
if (!empty($this->request->data['voluntarios']['_ids'])) {
$vol = [];
$ids = [];
foreach ($this->request->data['voluntarios']['_ids'] as $key=>$locationId) {
$vol['_ids'][$key] = $locationId;
$vol[] = [
'_joinData' => [
'lider' => isset($this->request->data['voluntarios'][$key]['_joinData']['lider']) ? $this->request->data['voluntarios'][$key]['_joinData']['lider'] : false
]
];
}
}
if (isset($vol)){
$this->request->data['voluntarios'] = $vol;
}
$this->Brigadas->patchEntity($brigada, $this->request->data, ['associated' => ['Voluntarios._joinData', 'Participaciones', 'Participaciones._joinData']]);
if ($this->Brigadas->save($brigada)) {
$this->Flash->success(__('Your team data has been updated.'));
return $this->redirect(['action' => 'view', $id]);
}
$this->Flash->error(__('Unable to update your team data.'));
}
}
This is how I iterated my form. Noticed that I added an extra hidden form for id just to try changing the id numbers. But the result is exactly the same in the end.
foreach($all_vol as $key=>$voluntario){
echo $this->Form->control('voluntarios.'.$key.'.id', ['hidden' => true]);
echo $this->Form->control('voluntarios.'.$key.'._joinData.lider', [
'label' => $voluntario->full_name,
'default'=>'0',
]);
}
Here is the request sent by the form.
[
'_ids' => [
(int) 0 => '1',
(int) 1 => '2',
(int) 2 => '184',
(int) 3 => '303',
(int) 4 => '1838',
(int) 5 => '1873',
(int) 6 => '2553',
(int) 7 => '4467',
(int) 8 => '4973',
(int) 9 => '5148',
(int) 10 => '5493',
(int) 11 => '6307',
(int) 12 => '7055',
(int) 13 => '7467',
(int) 14 => '7561',
(int) 15 => '7567',
(int) 16 => '7864'
],
(int) 0 => [
'id' => '184',
'_joinData' => [
'lider' => '0'
]
],
(int) 1 => [
'id' => '303',
'_joinData' => [
'lider' => '0'
]
],
(int) 2 => [
'id' => '1838',
'_joinData' => [
'lider' => '0'
]
],
(int) 3 => [
'id' => '1873',
'_joinData' => [
'lider' => '0'
]
],
(int) 4 => [
'id' => '2553',
'_joinData' => [
'lider' => '0'
]
],
(int) 5 => [
'id' => '4467',
'_joinData' => [
'lider' => '0'
]
],
(int) 6 => [
'id' => '4973',
'_joinData' => [
'lider' => '0'
]
],
(int) 7 => [
'id' => '5148',
'_joinData' => [
'lider' => '0'
]
],
(int) 8 => [
'id' => '5493',
'_joinData' => [
'lider' => '0'
]
],
(int) 9 => [
'id' => '6307',
'_joinData' => [
'lider' => '0'
]
],
(int) 10 => [
'id' => '7055',
'_joinData' => [
'lider' => '0'
]
],
(int) 11 => [
'id' => '7467',
'_joinData' => [
'lider' => '0'
]
],
(int) 12 => [
'id' => '7561',
'_joinData' => [
'lider' => '0'
]
],
(int) 13 => [
'id' => '7567',
'_joinData' => [
'lider' => '0'
]
],
(int) 14 => [
'id' => '7864',
'_joinData' => [
'lider' => '0'
]
],
(int) 15 => [
'id' => '1',
'_joinData' => [
'lider' => '1'
]
],
(int) 16 => [
'id' => '2',
'_joinData' => [
'lider' => '1'
]
]
]
I added items with id 1 and 2 to the bottom and turned them into 'lider', but when they're passed to patchEntity, two different items are selected as 'lider'. Here is the request after editing it manually.
[
(int) 0 => [
'id' => '1',
'_joinData' => [
'lider' => '1'
]
],
(int) 1 => [
'id' => '2',
'_joinData' => [
'lider' => '1'
]
],
(int) 2 => [
'id' => '184',
'_joinData' => [
'lider' => '0'
]
],
(int) 3 => [
'id' => '303',
'_joinData' => [
'lider' => '0'
]
],
(int) 4 => [
'id' => '1838',
'_joinData' => [
'lider' => '0'
]
],
(int) 5 => [
'id' => '1873',
'_joinData' => [
'lider' => '0'
]
],
(int) 6 => [
'id' => '2553',
'_joinData' => [
'lider' => '0'
]
],
(int) 7 => [
'id' => '4467',
'_joinData' => [
'lider' => '0'
]
],
(int) 8 => [
'id' => '4973',
'_joinData' => [
'lider' => '0'
]
],
(int) 9 => [
'id' => '5148',
'_joinData' => [
'lider' => '0'
]
],
(int) 10 => [
'id' => '5493',
'_joinData' => [
'lider' => '0'
]
],
(int) 11 => [
'id' => '6307',
'_joinData' => [
'lider' => '0'
]
],
(int) 12 => [
'id' => '7055',
'_joinData' => [
'lider' => '0'
]
],
(int) 13 => [
'id' => '7467',
'_joinData' => [
'lider' => '0'
]
],
(int) 14 => [
'id' => '7561',
'_joinData' => [
'lider' => '0'
]
],
(int) 15 => [
'id' => '7567',
'_joinData' => [
'lider' => '0'
]
],
(int) 16 => [
'id' => '7864',
'_joinData' => [
'lider' => '0'
]
],
'_ids' => [
(int) 0 => '1',
(int) 1 => '2',
(int) 2 => '184',
(int) 3 => '303',
(int) 4 => '1838',
(int) 5 => '1873',
(int) 6 => '2553',
(int) 7 => '4467',
(int) 8 => '4973',
(int) 9 => '5148',
(int) 10 => '5493',
(int) 11 => '6307',
(int) 12 => '7055',
(int) 13 => '7467',
(int) 14 => '7561',
(int) 15 => '7567',
(int) 16 => '7864'
]
]
In the end, it doesn't matter whether I edit manually or not, since I get this on my patchEntity call. Notice that 'id' isn't neither 1 or 2:
'_joinData' => object(App\Model\Entity\Participacione) {
'id' => (int) 981,
'brigada_id' => (int) 222,
'voluntario_id' => (int) 7567,
'lider' => true,
'[new]' => false,
'[accessible]' => [
'brigada_id' => true,
'voluntario_id' => true,
'lider' => true,
'brigada' => true,
'voluntario' => true
How can I solve this? I've posted other questions without many answers, but I'll keep having faith in humanity to sort this out. Thanks in advance for reading my question!

Answer 1

Surprisingly I managed to solve it by using a sort attribute in my table. Like this:
$this->belongsToMany('Voluntarios', [
'foreignKey' => 'brigada_id',
'targetForeignKey' => 'voluntario_id',
'joinTable' => 'participaciones',
'saveStrategy' => 'replace',
'through' => 'Participaciones',
'sort' => ['Voluntarios.id' => 'ASC'],
]);
I feel like everything is pretty forced, but I couldn't find a nicer way to do it. I'm noticing a few bugs by the time I delete a starred value, but it's a step in the right direction.