Yii：以单一形式使用两个模型

Question

I have a Three models

1. Books
2. Categories
3. Category mapping

I want to store relation of books and their categories in Category mapping Table. By getting the details of categories using checkboxlist in yii in the the Form of Books.

Like

Book Name: ______________

Book Author: ______________

Book Published:  _____________

Categories---------------------------------------------

[] Educational  [] Academic [] Spiritual []Self Help   

-------------------------------------------------------

(Save)

For Eg: In Category mapping Table

Book ID | Category ID 
   1    |      2      
   1    |      5
   1    |      7
   2    |      2

In the controller/Book.php

public function actionCreate()
    {
        $model=new Book;

        if(isset($_POST['Book']))
        {

           $bid=$model->book_id;
            if(isset($_POST['Category'])){

                foreach ($_POST['Category'] as $category) {
                    $category = new Category();
                    $category->attributes=$_POST['Category'];
                    $category->map_book_id=$bid;
                    $category[] = $category;
                }
                if(!empty($category)){
                    $category->save();
                }
            }

            if($model->save()){

                $this->redirect(array('view','id'=>$model->book_id));
            }

        }

        $this->render('create',array(
            'model'=>$model,
            'category'=>$category,
        ));
    }

It is not working. Please help.

Answer 1

When a Book is saved, you wish to save the Categories for it in the Category Mapping table.

Lets say that the Model for it is CategoryMapping .

Try -

//After saving the Book, you have the Book Id in `$bid` variable.

$category_arr = array();

if(isset($_POST['Category'])){

    foreach ($_POST['Category'] as $category) {
        $category_map = new CategoryMapping();
        $category_map->category_id = $category;
        $category_map->book_id = $bid;

        //..... some other attributes to set

        if($category_map->save()) {
            $category_arr[] = $category;
        } else {
            print_r($category_map->getErrors());    //Just for debugging
        }
    }

}

Then -

$this->render('create',array(
    'model'=>$model,
    'category'=>$category_arr,
));