PatchEntities Code

 public function stock($id = null)
    {
        $fabric = $this->Fabrics->get($id, ['contain' => ['FabricColours']]);
        if($this->request->is('post'))
        {

            $list = $this->Fabrics->FabricColours->find('all')->where(['fabric_id' => $id])->toArray();
            $fabricColours = $this->Fabrics->patchEntities($list, $this->request->data('data'));
            $data = $this->request->data['data'];
            $countOf =  count($fabricColours);
            $this->set(array('data' => $data,'fabricColours' => $fabricColours,'list' => $list, 'countOf' => $countOf, '_serialize' => ['data', 'countOf', 'fabricColours', 'list']));
            return;

            foreach($fabricColours as $fabricColour)
            {
                 $this->Fabrics->FabricColours->save($fabricColour);
            }
        }

        $this->set('title', 'Colour stocks for ' . $fabric->name);
        $this->set('_serialize', 'fabric');
        $this->set(compact('fabric'));
    }