Yii: app () solution

Yii: The yii Framework used by the app () solution company has followed the learning process. However, I have never understood it in a few places. I hope there is such a method & nbsp; yii :: app ()-& gt; user-& gt; com_id & nbsp; yii: app ()-& gt; user-& gt; real_name yii: app ()
The yii Framework used by the company has followed the learning process, but I have never understood it in a few places.

There is a method like yii: app ()-> user-> com_id yii: app ()-> user-> real_name
This user table is a data table we have added, so the method here is not the default for yii, but I have not found where to write it, there are many similar to yii: app () the following method

The second problem I saw on the official website is that control is all placed on the protected/control Template page in protected/views, but I found that my project is also different, first, some Controller files are included in protected/control, however, a file named protected/modules is added, and the member and memadmin foreground and background files are placed in the controllers folder and views folder, and a MemberModule is added. php files are placed in the front-end control file. the back-end control file also has a template page. I really don't understand how these files are set, how to separate them, and where to set them, if I cannot understand the distribution of these files on a complete website, please kindly advise.
------ Solution --------------------
1. user table problems
Yii abstracts a class for each table. you can see this in print_r (yii: app ();
2. the directory distribution of yii is his/her conventions, for example, 6 ~ The description of each directory is displayed on page 7.
3. yii organizes code by project. Generally, the website has both the front-end and back-end services.
This is clearly not the case for your company's website, that is, you have changed the default settings and mixed the two projects. Therefore, the directory layout is adjusted to avoid conflicts.