Yii2: The proposal to use the definition labels of attribute for DynamicModel.

[InteLigent]

I use DynamicModel for creating dynamic fields with client validation, therefore i need definition labels of attributes.

Example code:

class DynamicModel extends \yii\base\DynamicModel
{
    private $_attributeLabels;

    public function defineAttribute($name, $value = null)
    {
        $this->_attributes[$name] = $value;
        return $this;
    }

    public function defineLabel($name, $label)
    {
        $this->_attributeLabels[$name] = $label;
    }

    public function attributeLabels()
    {
        return $this->_attributeLabels;
    }
}

[klimov-paul]

Why do you need this?
Note that DynamicModel has been created to allow execution of the particular validator and does not meant to be used for error message composition.

[InteLigent]

I know, but DynamicModel is the great class, as it can to use not only as ad-hoc validation, but also as model for creating dynamic fields form against help ajax.

I describe a small example of how I use:

publuc getAdditionalFields() 
{
    /**
     * Bad code, but i need discard echo output in init method of widget.
     * I propose to move code from ActiveForm::init()
     *    echo Html::beginForm($this->action, $this->method, $this->options);
     * to ActiveForm::begin(), so the source code will be more clean and understandable.
     */
    ob_start();
    $form = ActiveForm::begin([
        'layout'      => 'stacked',
        'fieldConfig' => [
            'inputOptions' => ['class' => 'uk-form-large uk-width-1-1']
        ]
    ]);
    ob_end_clean();

    $js = [];
    $html = '';

    $attributeTemplate = new Template();

    /**
     * In function getAttributesByCategoryId sample code:
     *
     *  $model = new DynamicModel();
     *  .....
     *  $model->defineAttribute('attr_' . $attribute_id)
     *        ->defineLabel('attr_' . $attribute_id, $attribute['name']);
     *  .....
     *  $model->addRule('attr_' . $attribute_id, 'integer', ['min' => $attribute['settings']['min'], 'max' => $attribute['settings']['max']]);
     */
    list($model, $attribute_groups) = $attributeTemplate->getAttributesByCategoryId($category_id);

    foreach ($attribute_groups as $attribute_group) {
        foreach ($attribute_group['attributes'] as $attribute) {

            /**
             * I have been changed access function 'getClientOptions' from protected to public access in my subclass.
             * I also propose to change access 'getClientOptions' to access to functions client Validation in custom situation.
             */
            $clientOptions = $form->field($model,  'attr_' . $attribute['attribute_id'])->getClientOptions();

            if (!empty($clientOptions))
                $js['attr_' . $attribute['attribute_id']] = $clientOptions;
        }
    }

    /**
     *  In function 'renderPartial' generating HTML code, for my dynamic fields.
     */
    Yii::$app->response->data['js']   = Json::encode($js);
    Yii::$app->response->data['html'] = $this->renderPartial('attributes', [
        'form'             => $form,
        'model'            => $model,
        'attribute_groups' => $attribute_groups
    ]);
}

Simple code on JS for appending HTML content and eval JS code.

$.getJSON('[]', param, app.ajaxIsSuccess(function(json) {
       var attribute = (new Function("", "var json = " + json.js + "; return json;"))();
       $("#product-features").append(json.html);

        $.each(attribute, function(id, options) {
            $('#product-form').yiiActiveForm('add', options);
       });
});

Sorry for my weak English, but in a way I have been implemented generating dynamically fields with a client validation.

[klimov-paul]

In your example it is better to define a special model class, with your own attributes() method implemntation, instead of using dynamic model for this.

[InteLigent]

I have classifier which contains about 8000 categories, each category has about 150 attributes. In the future the number of attributes and categories can be changed. I have been created templates for manage categories and its attributes throught web interface. Therefore i need in dynamic model, for me the good solution is DynamicModel, with its dynamic definition attributes and rules.

[klimov-paul]

Your own mode still should be dynamic.
Your need is specific and reqiures specific solution.

[klimov-paul]

Instead of using DynamicModel you should create you own model:

class CategoryAttributesModel extends Model
{
    public $category;

    public function attributes()
    {
        $attributes = [];
        foreach ($this->category->attributes as $categoryAttribute) {
            $attributes[] = 'category_' . $categoryAttribute;
        }
        return $attributes;
    }

    public function rules()
    {
        $rules = [];
        foreach ($this->attributes() as $attribute) {
            $rules[] = [$attribute, 'required']
        }
        return $rules;
    }
}

I hope this code can provide you the idea.

[conick]

+1 for ability to setting attributeLabels. Sometimes we creates forms with mixed logic. DynamicModel perfect works in frontend with ActiveForm It lacks only the correct validation messages.

[AccessDenied80]

+1

[Danillaa]

+1

[tekord]

+1 use dynamic model is a quicker way to make small model than writing regular model class. My use case is search model with the only attribute 'query' and string length validator. I want to set label for this attribute, but I can't.