protected function _prepareForm()
    {
        $model = $this->getModel();

        /** @var \Magento\Framework\Data\Form $form */
        $form = $this->_formFactory->create(
            ['data' => ['id' => 'edit_form', 'action' => $this->getData('action'), 'method' => 'post']]
        );

        $fieldset = $form->addFieldset('base_fieldset', ['legend' => __('General Information')]);

        if ($model->getId()) {
            $fieldset->addField('thesaurus_id', 'hidden', ['name' => 'thesaurus_id']);
        }

        if ($model->getType()) {
            $fieldset->addField('type', 'hidden', ['name' => 'type']);
        }

        $this->initBaseFields($fieldset);
        $this->initTypeFields($fieldset, $model);

        $form->setValues($model->getData());

        $form->setUseContainer(true);
        $this->setForm($form);

        return parent::_prepareForm();
    }