Question

我对Kohana 3.3和ORM关系has_many_through有问题。我有两个型号

Model_Category

class Model_Category extends ORM {

    protected $_table_name = 'category';
    protected $_primary_key = 'category_id';
    protected $_has_many = array(
        'question' => array(
            'model' => 'Question',
            'through' => 'cat_question'
        ),
    );

}

Model_Question

class Model_Question extends ORM {

    protected $_table_name = 'question';
    protected $_primary_key = 'question_id';
    protected $_has_many = array(
        'category' => array(
            'model' => 'Category',
            'through' => 'cat_question'
        ),
    );

}

表cat_question中有两列，category_id, question_id，

question

：question_id, title, content, date，

category

category_id, name

但它不是很好的工作......当我这样做时

$orm = ORM::factory('Question')->find_all();
foreach($orm as $el) {
    var_dump($el->category->name);
}

他们告诉我NULL，但我不知道为什么。

Answer 1

我处理这个，问题模型应该是这样的：

class Model_Question extends ORM {

    protected $_table_name = 'question';
    protected $_primary_key = 'question_id';

     protected $_has_many = array(
        'category' => array(
            'model' => 'Category',
            'through' => 'cat_question',
            'far_key' => 'category_id',
            'foreign_key' => 'question_id',
            ),
    );
  }

和类别模型

class Model_Category extends ORM {

    protected $_table_name = 'category';
    protected $_primary_key = 'category_id';


    protected $_has_many = array(
        'question' => array(
            'model' => 'Question', 
            'far_key' => 'question_id',
            'through' => 'cat_question',
            'foreign_key' => 'category_id'
            ),
    );

}

如果我们想要所有带有计数问题的类别，请执行以下操作：

  public function get_category_and_question() {
        $orm = ORM::factory('Category');
        $find = $orm->find_all();
        foreach ($find as $element) {
            $count = ORM::factory('Category', $element->category_id)->question->count_all();
            $new_array[] = array(
                'name' => $element->name,
                'id' => $element->category_id,
                'how_much' => $count
            );
        }
        return $new_array;
    }

我不确定这是否真的很好解决，但对我来说并不坏。

Answer 2

问题是，has_many_through意味着多对多。因此，一个类别包含多个问题，反之亦然。现在，如果您遵循Kohana的标准，您的数据库名称将为categories, questions, categories_questions，名称将为复数，因此可通过categories或questions访问。

但是你没有，为了你的代码需要看起来像下面的

$orm = ORM::factory('Question')->find_all();
foreach($orm as $el)
{
    $categories = $el->category->find_all();
    foreach ($categories as $category)
    {
        var_dump($category->name);
    }
}

Kohana和ORM的关系已经过去了

2 个答案: