How to Understand model ()

How to Understand model? YII has the following code: $ post = Post: model ()-& gt; findByAttributes ($ attributes, $ condition, $ params); & nbsp; & nbsp; Post: model ()-model () how to understand?
YII has the following code: $ post = Post: model ()-> findByAttributes ($ attributes, $ condition, $ params );
Post: model ()-> find ()-> attributes.
How can we understand the model () change?
------ Solution --------------------
The model overwrites the parent class method and instantiates the object of this class.
Your example, that is, the model () instance has the Post class instance.
The findByAttributes method is also in the parent class.

// This is the method in the ar class.
Public static function model ($ className =__ CLASS __)
{
If (isset (self ::$ _ models [$ className])
Return self: $ _ models [$ className];
Else
{
$ Model = self ::$ _ models [$ className] = new $ className (null );
$ Model-> _ md = new CActiveRecordMetaData ($ model );
$ Model-> attachBehaviors ($ model-> behaviors ());
Return $ model;
}
}

------ Solution --------------------
Post: model () returns a specified object
------ Solution --------------------
The model method returns an instance of the POST class.