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如何在学说中定义n-m关系?

relationship doctrine schema php

murze · 技术社区 · 14 年前

基类文章如下所示:

abstract class BaseArticle extends Doctrine_Record {
public function setTableDefinition() {
    $this->setTableName('article');
    $this->hasColumn('article_id', 'integer', 8, array(
            'type' => 'integer',
            'length' => 8,
            'fixed' => false,
            'unsigned' => false,
            'primary' => true,
            'autoincrement' => true,
    ));
    $this->hasColumn('title', 'string', null, array(
            'type' => 'string',
            'fixed' => false,
            'unsigned' => false,
            'primary' => false,
            'notnull' => false,
            'autoincrement' => false,
    ));
    $this->hasColumn('text', 'string', null, array(
            'type' => 'string',
            'fixed' => false,
            'unsigned' => false,
            'primary' => false,
            'notnull' => false,
            'autoincrement' => false,
    $this->hasColumn('url', 'string', 255, array(
            'type' => 'string',
            'length' => 255,
            'fixed' => false,
            'unsigned' => false,
            'primary' => false,
            'notnull' => false,
            'autoincrement' => false,
    ));
}

public function setUp() {
    parent::setUp();
    $this->hasMany('Tag as Tags', array( 'local' => 'article_id',
            'foreign'=>'tag_id',
            'refClass'=>'Articletag')
    );
}

BaseTag类如下所示:

abstract class BaseTag extends Doctrine_Record {
public function setTableDefinition() {
    $this->setTableName('tag');
    $this->hasColumn('tag_id', 'integer', 4, array(
            'type' => 'integer',
            'length' => 4,
            'fixed' => false,
            'unsigned' => false,
            'primary' => true,
            'autoincrement' => true,
    ));
    $this->hasColumn('name', 'string', null, array(
            'type' => 'string',
            'fixed' => false,
            'unsigned' => false,
            'primary' => false,
            'notnull' => false,
            'autoincrement' => false,
    ));
}

public function setUp() {
    parent::setUp();
    $this->hasMany('Article as Articles', array( 'local' => 'tag_id',
            'foreign'=>'article_id',
            'refClass'=>'Articletag')
    );
}

}

关系课是这样的:

    abstract class BaseArticletag extends Doctrine_Record
{
    public function setTableDefinition()
    {
        $this->setTableName('articletag');
        $this->hasColumn('article_id', 'integer', 8, array(
             'type' => 'integer',
             'length' => 8,
             'fixed' => false,
             'unsigned' => false,
             'primary' => true,
             'autoincrement' => false,
             ));
        $this->hasColumn('tag_id', 'integer', 4, array(
             'type' => 'integer',
             'length' => 4,
             'fixed' => false,
             'unsigned' => false,
             'primary' => true,
             'autoincrement' => false,
             ));
    }

    public function setUp()
    {
        parent::setUp();
    }
}

        $article = Doctrine_Query::create()->from('Article a')
                            ->where('id = ?' , 1)
                            ->fetchOne();
        echo $article->title; //gives me the title

但是当我尝试这个的时候:

        foreach($article->Tags as $tag) {
          echo($tag->name)
        }

我得到一个错误:

Unknown record property / related component "Tags" on "Article"

2 回复 | 直到 14 年前

DuoSRX 14 年前

要设置多对多关系,必须将关系放在关联表中,而不是联接表中,如下所示:(simplified)

Article
...
  Relations:
    Tags:
      class: Tag
      local: article_id
      foreign: tag_id
      refClass: ArticleTag

Tag
...
  Relations:
    Articles:
      class: Article
      local: tag_id
      foreign: article_id
      refClass: ArticleTag

ArticleTag:
(no relations)

然后您将能够执行诸如$article->标记之类的操作。更多信息请访问 Doctrine Documentation .

murze 14 年前