How to add custom field prestashop 1.7.4 or 1.7.5

How to add custom field prestashop

Step 1

first in database in the table ps_product_lang add your field "my_extra_field_description" type TEXT

Step 2

add an override of class product in override/classes

class Product extends ProductCore
{
    public $my_extra_field_description;

    public function __construct($id_product = null, $full = false, $id_lang = null, $id_shop = null, Context $context = null)
    {
      Product::$definition['fields']['my_extra_field_description'] = array('type' => self::TYPE_HTML, 'lang' => true, 'validate' => 'isString');
      parent::__construct($id_product, $full, $id_lang, $id_shop, $context);
    }


}

Step 3

src/PrestaShopBundle/Form/Admin/Product/ProductInformation.php

        ->add('my_extra_field_description', 'PrestaShopBundle\Form\Admin\Type\TranslateType', array(
            'type' => 'Symfony\Component\Form\Extension\Core\Type\TextareaType',
            'options' => [
                'attr' => array('class' => 'autoload_rte'),
                'required' => false
            ],
            'locales' => $this->locales,
            'hideTabs' => true,
            'label' =>  $this->translator->trans('my_extra_field_description', [], 'Admin.Global'),
            'required' => false
        ))

Step 4

in src/PrestaShopBundle/Model/Product/AdminModelAdapter.php:

    //define translatable key
        $this->translatableKeys = array(
            'name',
            'description',
            'description_short',
            'my_extra_field_description',
            'link_rewrite',
            'meta_title',
            'meta_description',
            'available_now',
            'available_later',
            'tags',
        );

        //define unused key for manual binding
        $this->unmapKeys = array('name',
            'description',
            'description_short',
            'my_extra_field_description',
            'images',
            'related_products',
            'categories',
            'suppliers',
            'display_options',
            'features',
            'specific_price',
            'virtual_product',
            'attachment_product',
        );

step 5

and below in the function getFormData() add field :

                'my_extra_field_description' => $this->product->my_extra_field_description,

Step 6

in src/PrestaShopBundle/Resources/views/Admin/Product/ProductPage/product.html.twig:

                     'formInfoSupp': form.step1.my_extra_field_description

and in src/PrestaShopBundle/Resources/views/Admin/Product/ProductPage/Panels/essentials.html.twig:

add:

 <div class="tab-pane panel panel-default " id="my_extra_field_description">
                      {{ form_widget(formInfoSupp) }} 
                      </div>

add after decription

 <li id="tab_my_extra_field_description" class="nav-item"><a href="#my_extra_field_description" data-toggle="tab" class="nav-link description-tab">Info supplémentaire</a></li>

Don't foreget to remove cache

How to add custom field prestashop 1.7.4 or 1.7.5

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