Where to put what ------------------ Many time,Often, when writing widgets or editing GYii code, there can be the doubt ifit is unclear whether or not the code is following the MVC patter or not.
 
 
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Here are a few suggestion cans to help to detected the most evident error of styleobvious style errors. ### Controller In tThe controller there should be thecontain code for collecting user input, retriveving models from the database, and rendering views. In a controller there should never be: - htmlHTML code (it: HTML should be in the view) - sqlSQL code (there should never be, if is: If needed it, SQL should staybe in a model) - fField name theys: Field names should be in the view. Avoiding embedding field names allows you to change the database with minimal efforteasily. ### Views In the views (and only in the views) there should be the html code. 
 
 
In the view thereHTML code should only be in views.
 
 
Views should not becontain: - uUser input (e.g. $_GET, and $_POST) i: Input should be collected in models in the controllers, never in views. - sql code: if isSQL: When needed, betterit is best to create a functions in the models The less phpfewer PHP operations there are in the views, the bestter it is. Instead of concatenate 2ing  two fields, it is better to write a getter method, so you can reuse it in other views. ### Models The m
 
Models are used for collecting user inputs, and access toing the database. In the models there should not be: - uUser input ($_GET, $_POST)y: You should write a function that will be called in the controller. - html code (itHTML: HTML should be in thea view)
 
Widgets ------------------ Widgets hasve a behaviour similar to controllers. If a widget is supposed to create a lot of html,HTML, it is better to create a view file for it.