Yii中$ model-> attributes和$ model-> setAttributes（）之间的区别

Question

Whenever I use $model->attributes=$_POST['Users'] ,it saves Data from User form.

When I use $model->setAttributes($_POST['Users']) ,it also saves Data from User form.

So please can anyone clarify the difference between the two codes ?

Answer 1

With $this->setAttributes() you can assign unsafe attributes, using $this->attributes you cant.

Assigning unsafe attributes:

$this->setAttributes($_POST['Model'], false);

More info in: http://www.yiiframework.com/doc/api/1.1/CModel/#setAttributes-detail

Answer 2

As stated in the Yii wiki, you can use any of these. With $model->attributes you set the variable directly. With $model->setAttributes() you set the variable through a so called 'setter method'.

http://www.yiiframework.com/wiki/167/understanding-virtual-attributes-and-get-set-methods/#hh1

I would use the setter method instead of directly calling the variable, as you can add a line in your setter method, and it would apply to all of its calls, and it would save you from a lot of headache in the future.

Example:

class Model {
  public $attributes;

  public function setAttributes($attributes) {
    $this->attributes = $attributes;
  }
  public function getAttributes() {
    return $this->attributes;
  }
}

$model = new Model();
$model->setAttributes("Foo");
echo $model->getAttributes();
$model->setAttributes("Bar");
echo $model->getAttributes();

So, now if you would like to make an additional operation on the attribute, you could add it to the setAttributes() method, and instead of changing two lines of code, you could change only one.

Example:

class Model {
  public $attributes;

  public function setAttributes($attributes) {
    $this->attributes = $attributes . "-Bar";
  }
  public function getAttributes() {
    return $this->attributes;
  }
}

$model = new Model();
$model->setAttributes("Foo");
echo $model->getAttributes();
$model->setAttributes("Bar");
echo $model->getAttributes();

Now scale this up to a level, when it would be inconvenient to change thousands of lines of code, instead of changing a couple of setter methods.

Answer 3

There is absolutely no difference.

When you try to assign a property that is not defined as a PHP class property (such as attributes here) on a component , Yii by convention calls the similarly-named setter method setAttributes instead. If no such method exists an exception is thrown. Since a Yii model is a component and models do not have an attributes property, the setter method is called even when you use the first form.

All of this is also explained in detail in the manual.

Answer 4

$model->attributes=$_POST['Users']// means setting value of property directly while
$model->setAttributes($_POST['Users']) //is method or function which is indirectly set value of $model->attributes property;  

Lets take an example

  class Model{
        public $attributes;


         public function setAttributes($att){
             $this->attributes=$att;

        }


  }

            //Now the value of $attributes can be set by two way


 $model = new Model();
 $model->attributes=$value; // 1st way
 $model->setAttributes($value); //2nd way

Answer 5

There is no difference. array_merge used to merge attributes, if set later