我是 cake php 的新手。我在 db 上保存了笔记。每次用户编辑此注释时，它都会在数据库中保存为新版本，如 1.0、1.1、1.2……现在的问题是我想选择注释但具有最高版本。我有很多关系。这些笔记与项目有关。但我试过在我的关系中使用 finderQuery

我的项目模型关系是

public $hasMany = array(
        'Notes' => array(
            'className' => 'Notes',
            'foreignKey' => 'project_id',
            'dependent' => true,
            'conditions' => '',
            'fields' => '',
            'order' => 'Notes.version desc',
            'limit' => '',
            'offset' => '',
            'exclusive' => '',
            'finderQuery' => '',
            'counterQuery' => ''
        )
);

我也试过用 limit as 1 'limit' => '1', 但是.n 它只显示 1 条记录。 我发现它可以用 finderQuery 来完成。所以我像这样使用它

'Notes' => array(
            'className' => 'Notes',
            'foreignKey' => 'project_id',
            'dependent' => true,
            'conditions' => '',
            'fields' => '',
            'order' => 'Notes.version desc',
            'limit' => '',
            'offset' => '',
            'exclusive' => '',
            'finderQuery' => 'SELECT Notes.* FROM ce_notes AS Notes WHERE Notes.version="select max(Notes.version) from ce_notes"',
            'counterQuery' => ''
        )

它显示空结果。

更新

如果我在类似条件下使用静态版本

public $hasMany = array(
        'Notes' => array(
            'className' => 'Notes',
            'foreignKey' => 'project_id',
            'dependent' => true,
            'conditions' => 'Notes.version=1.1', // here if Notes.version=max(Notes.version) can work 
            'fields' => '',
            'order' => 'Notes.version desc',
            'limit' => '',
            'offset' => '',
            'exclusive' => '',
            'finderQuery' => '',
            'counterQuery' => ''
        ),

我找不到执行此操作的方法。虽然我可以使用核心 mysqli 查询来执行此操作，但我想使用 cakephp 的标准。请帮我

最佳答案

我已经用我的自定义查询做到了这一点。如果有更好的方法，任何人都可以回答。我的 Controller 功能是

 public function admin_view($id = null)
    {
        $this->Project->id = $id;
        if (!$this->Project->exists())
        {
            throw new NotFoundException(__('Invalid project'));
        }
        $project = $this->Project->find('first', array(
            'conditions' => array('Project.id' => $id),
            'contain' => array('Client', 'Phase','Notes')));
        $query="SELECT  `Notes`.`id` ,  `Notes`.`project_id` ,  `Notes`.`version` ,  `Notes`.`title` ,  `Notes`.`slug` ,  `Notes`.`comment_count` ,  `Notes`.`description` ,  `Notes`.`created` , `Notes`.`modified` ,  `Notes`.`project_id` 
            FROM  `EB`.`ce_notes` AS  `Notes` 
            WHERE  `Notes`.`project_id` = ('".$id."') 
            AND  `Notes`.`version` = ( 
            SELECT MAX(  `Notes`.`version` ) 
            FROM  `EB`.`ce_notes` AS  `Notes` 
            WHERE  `Notes`.`project_id` = ('".$id."') ) 
            ORDER BY  `Notes`.`version`";
       $notes= $this->Project->query($query);       
        $this->set(array('project'=>$project,'notes'=>$notes));
    }

模型关系船是

public $hasMany = array(
        'Notes' => array(
            'className' => 'Notes',
            'foreignKey' => 'project_id',
            'dependent' => true,
            'conditions' => '',
            'group' => 'Notes.version',
            'order' => 'Notes.version desc',
            'limit' => '',
            'offset' => '',
            'exclusive' => '',
            'finderQuery' => '',
            'counterQuery' => ''
        ),
        'Notescomment' => array(
            'className' => 'Notescomment',
            'foreignKey' => 'note_id',
            'dependent' => true,
            'conditions' => '',
            'fields' => '',
            'order' => 'Notescomment.created desc',
            'limit' => '',
            'offset' => '',
            'exclusive' => '',
            'finderQuery' => '',
            'counterQuery' => ''
        ),
        'Phase' => array(
            'className' => 'Phase',
            'foreignKey' => 'project_id',
            'dependent' => true,
            'conditions' => '',
            'fields' => '',
            'order' => 'Phase.position asc',
            'limit' => '',
            'offset' => '',
            'exclusive' => '',
            'finderQuery' => '',
            'counterQuery' => ''
        ),
        'Notification' => array(
            'className' => 'Notification',
            'foreignKey' => 'project_id',
            'dependent' => true,
            'conditions' => '',
            'fields' => '',
            'order' => 'Notification.created desc',
            'limit' => '',
            'offset' => '',
            'exclusive' => '',
            'finderQuery' => '',
            'counterQuery' => ''
        )

    );

    /**
     * Contains this model's hasAndBelongsTo entity associations
     *
     * @var array
     */
    public $hasAndBelongsToMany = array(
        'Client' => array(
            'className' => 'Client',
            'joinTable' => 'projects_clients',
            'foreignKey' => 'project_id',
            'associationForeignKey' => 'client_id',
            'unique' => 'keepExisting',
            'conditions' => '',
            'fields' => '',
            'order' => '',
            'limit' => '',
            'offset' => '',
            'finderQuery' => '',
            'deleteQuery' => '',
            'insertQuery' => ''
        ),
        'User' => array(
            'className' => 'User',
            'joinTable' => 'projects_users',
            'foreignKey' => 'project_id',
            'associationForeignKey' => 'user_id',
            'unique' => 'keepExisting',
            'with' => 'ProjectsUser',
            'conditions' => '',
            'fields' => '',
            'order' => '',
            'limit' => '',
            'offset' => '',
            'finderQuery' => '',
            'deleteQuery' => '',
            'insertQuery' => ''
        ),
    );

关于php - 在 cake php 中从 db 获取最新保存的文件版本，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31153538/