Question

我想检查一下，确保在删除Venue之前，它没有绑定任何Events。

Venue hasMany Event
Event belongsTo Venue

我相信我会在我的Venue模型中的beforeDelete函数中执行此操作 - 但是 - 除此之外，我不确定如何检查事件...我是否必须包含对事件的访问权限不知怎的？如果它失败了，有没有办法返回像验证允许的特定错误消息？或者......我在验证本身中这样做吗？

Answer 1

这应该做你需要的。它会在删除场地之前检查事件的数量，然后如果计数大于0，它将返回false，从而阻止删除。否则，如果没有相关事件，它将被删除。

// using app/models/venue.php
// In the following example, do not let a venue delete if it still contains events.
// A call of $this->Venue->delete($id) from VenueController.php has set $this->id .
// Assuming 'Venue hasMany Event', we can access $this->Event in the model.
function beforeDelete(){
    $count = $this->Event->find("count", array("conditions" => array("venue_id" => $this->id)));
    if ($count == 0) {
        return true;
    } else {
        return false;
    }
}

或者你可以这样做：

在您的模型中添加此方法

function hasEvents($venue_id){
    $count = $this->Event->find("count", array("conditions" => array("venue_id" => $venue_id)));
    if ($count == 0) {
        return false;
    } else {
        return true;
    }
}

在您的控制器中

if($this->Venue->hasEvents($venue_id)){
    //display error message that you cannot delete because venue has events
} else {
    $this->Venue->delete($venue_id);
}

Answer 2

我是CakePHP的新手，所以请大家不要理解这个答案。

我相信，由于Venue与Event有关系，您无需修改即可访问它：

$ this-＆gt;活动......

来自场地模型或控制器。

然后，您应该可以使用查询来查找具有该场地的任何事件。

Answer 3

使用此行为：

<?php
/**
 * Prevent deletion if child record found
 *
 * @author    Nik Chankov
 * @url    http://nik.chankov.net
 */
class HasChildrenBehavior extends ModelBehavior {
    /**
     * Empty Setup Function
    */
    function setup(&$model) {
        $this->model = $model;
    }

    /**
     * Run the check and cancel the deletion if child is found
     * @access public
     */
    function beforeDelete(){
        if(isset($this->model->hasMany)){
            foreach($this->model->hasMany as $key=>$value){
                $childRecords = $this->model->{$key}->find('count', array('conditions'=>array($value['foreignKey']=>$this->model->id)));
                if($childRecords > 0){
                    return false;
                }
            }
        }
        //Checking habtm relation as well, thanks to Zoltan
        if(isset($this->model->hasAndBelongsToMany)){
            foreach($this->model->hasAndBelongsToMany as $key=>$value){
                $childRecords = $this->model->{$key}->find('count', array('conditions'=>array($value['foreignKey']=>$this->model->id)));
                if($childRecords > 0){
                    return false;
                }
            }
        }
        return true;
    }
}
?>

消息来源：http://nik.chankov.net/2007/10/23/check-for-existing-childs-behaviour/

HTH。

Answer 4

使用cakephp 3.5.1试试这个..

产品型号中的

产品所属类别

分类控制器中的

public function delete($id = null)
{
    $this->request->allowMethod(['post', 'delete']);
    if($this->checkassociated($id) > 0){
        $this->Flash->error(__('this category could not be deleted.'));
    }else{
        $category = $this->Categories->get($id);
        if ($this->Categories->delete($category)) {
            $this->Flash->success(__('this category has been deleted.'));
        } else {
            $this->Flash->error(__('this category could not be deleted.'));
        }
    }
    return $this->redirect(['action' => 'index']);
}

public function checkassociated($category_id){
    $itemsTable = TableRegistry::get('Products');
    $itemdata = $itemsTable->find('all')
        ->where(['Products.category_id'=>$category_id]);
    $number = $itemdata->count();
    return $number;
}

在CakePHP中删除之前检查它是否有相关项

4 个答案: