In `Yii2` I'm passing model value but its showing as a null

Question

There is my controller code

 if ($this->request->isPost) {
            $model->created_by = Yii::$app->user->identity->id;
            $model->created_at = date('Y/m/d');
            // echo $model->created_at;die;
            if ($model->load($this->request->post()) && $model->save()) {
                return $this->redirect(['index', 'id' => $model->id]);
            }
        } 

and there is my model rule

public function rules()
{
    return [
        [['deduction_type'], 'required'],
        [['created_at'], 'safe'],
        [['created_by'], 'integer'],
        [['deduction_type'], 'string', 'max' => 100],
    ];
}

My problem is, every time I pass the value in create_at and create_by data save in database as a null. I want my actual value in db.

Answer 1

Instead of your way

 if ($this->request->isPost) {
            //Move that two Lines inside the if
            $model->created_by = Yii::$app->user->identity->id;
            $model->created_at = date('Y/m/d');

            // echo $model->created_at;die;
            if ($model->load($this->request->post()) && $model->save()) {
                return $this->redirect(['index', 'id' => $model->id]);
            }
        }

I usually do the following:

 if ($this->request->isPost) {
            if ($model->load($this->request->post()) && $model->validate()) {
                $model->created_by = Yii::$app->user->identity->id;
                $model->created_at = date('Y/m/d');
                $model->save();
                return $this->redirect(['index', 'id' => $model->id]);
            }
        }

validate()->Checks if the Inputs are Correct according to your rules. Afterwards you know that the entries were correct and you can set your values.
This is my usual way of tackling this problem. You can also wrap $model->save(); with an if to check your changes as well and to catch the potential falseof save().