如何使用Cakephp对查询进行连接?

如何使用Cakephp对查询进行连接?,cakephp,Cakephp,我有一个Comments表,用户可以在其中对另一个用户进行如下评论: 这些是制约因素: 使用此查询时: $comments = TableRegistry::getTableLocator() ->get('Comments') ->find('all'); $query = $comments ->find('all') ->contain(['Users']); 它检索注释

我有一个Comments表,用户可以在其中对另一个用户进行如下评论:

这些是制约因素:

使用此查询时:

$comments = TableRegistry::getTableLocator()
            ->get('Comments')
            ->find('all');
 $query = $comments
          ->find('all')
          ->contain(['Users']);
它检索注释,但仅在注释id上应用连接。 虽然我想检索comment对象,其中包含它的两个相关用户,一个作为评论员,另一个作为已评论,;那么,如何构建查询呢

以下是评论:

class CommentsTable extends Table
{
    /**
     * Initialize method
     *
     * @param array $config The configuration for the Table.
     * @return void
     */
public function initialize(array $config)
{
    parent::initialize($config);

    $this->setTable('comments');
    $this->setDisplayField('id');
    $this->setPrimaryKey('id');

    $this->belongsTo('Users', [
        'foreignKey' => 'commentator_id',
        'joinType' => 'INNER'
    ]);
    $this->belongsTo('Users', [
        'foreignKey' => 'commented_id',
        'joinType' => 'INNER'
    ]);
}

/**
 * Default validation rules.
 *
 * @param \Cake\Validation\Validator $validator Validator instance.
 * @return \Cake\Validation\Validator
 */
public function validationDefault(Validator $validator)
{
    $validator
        ->integer('id')
        ->allowEmpty('id', 'create');

    $validator
        ->scalar('content')
        ->maxLength('content', 255)
        ->requirePresence('content', 'create')
        ->notEmpty('content');

    $validator
        ->integer('score')
        ->requirePresence('score', 'create')
        ->notEmpty('score');

    $validator
        ->dateTime('created_at')
        ->requirePresence('created_at', 'create')
        ->notEmpty('created_at');

    $validator
        ->dateTime('updated_at')
        ->requirePresence('updated_at', 'create')
        ->notEmpty('updated_at');

    return $validator;
}

/**
 * Returns a rules checker object that will be used for validating
 * application integrity.
 *
 * @param \Cake\ORM\RulesChecker $rules The rules object to be modified.
 * @return \Cake\ORM\RulesChecker
 */
public function buildRules(RulesChecker $rules)
{
    $rules->add($rules->existsIn(['commentator_id'], 'Users'));
    $rules->add($rules->existsIn(['commented_id'], 'Users'));

    return $rules;
}

}

我不确定您的确切输出是什么,但根据我的理解,您可以使用自定义连接进行相同的操作:

$data = $this->Comments->find()
                        ->join([
                          'Users' => [
                                          'table' => 'users',
                                          'type' => 'INNER',
                                          'conditions' => [
                                              'Users.id=Comments.commentator_id',
                                           'OR' => [
                                                'Users.id=Comments.commented_id'
                                                   ]
                                            ] 
                                     ]
                              ]);
或者,您可以根据需要对此进行修改


希望这会有所帮助。

将您的人际关系更改为以下内容:

$this->belongsTo('Commenters', [
    'className' => 'Users',
    'foreignKey' => 'commentator_id',
    'joinType' => 'INNER'
]);
$this->belongsTo('Users', [
    'foreignKey' => 'commented_id',
    'joinType' => 'INNER'
]);
$comment->commenter->name; // Name of the person who commented
$comment->user->name; // Name of the person who was commented on
因此,您可以包含这两种不同的关系

$comments = TableRegistry::getTableLocator()
        ->get('Comments')
        ->find('all')
        ->contain(['Commenters', 'Users']);
然后像这样访问它们:

$this->belongsTo('Commenters', [
    'className' => 'Users',
    'foreignKey' => 'commentator_id',
    'joinType' => 'INNER'
]);
$this->belongsTo('Users', [
    'foreignKey' => 'commented_id',
    'joinType' => 'INNER'
]);
$comment->commenter->name; // Name of the person who commented
$comment->user->name; // Name of the person who was commented on

请从评论表模型发布您的关联。也可以向用户发布一个。两者的表架构也不会有任何影响。@cnizzardini这里我添加了:)我认为这不重要,因为您指定了键,但约定是user_id而不是commentor_id,comment_id而不是commented_id。这里的命名约定通常是关闭的。为什么不只拥有一个Comments表、一个Users表和一个UserComments表,并使用标准的蛋糕约定呢。好的,谢谢你,;因此,我必须检查我的数据库结构和命名convention@cnizzardini所以没有办法个性化表之间的join on字段?