Cakephp3在视图单元格中使用递归函数 [英] Cakephp3 using recursive function in view cells

问题描述

我想使用此

但是，如果我在控制器中执行相同的操作，则效果很好。
任何帮助都会节省我的时间。

解决方案

如果要创建动态菜单，请尝试以下操作：

首先检查您的MenusTable，您的表中应包含具有父ID（在我的示例中为parent_id）的字段，并创建一个RelationshipTo，hasMany

菜单模型

 类MenusTable扩展了表
 {
 
公共函数initialize（array $ config）
 {
 parent :: initialize（$ config）; 
 
 $ this->表（菜单）； 
 $ this-> displayField（’name’）; 
 $ this-> primaryKey（’id’）; 
 
 $ this-> addBehavior（'Timestamp'）; 
 $ this-> addBehavior（’Tree’）; 
 
 $ this-> belongsTo（'ParentMenus'，[
'className'=>'Menus'，
'foreignKey'=>'parent_id'
]）; 
 $ this-> hasMany（'ChildMenus'，[
‘className’=>‘Menus’，
‘foreignKey’=>’parent_id’
]）; 
} 
 
} 
  

MenuCell >

  class MenuCell扩展单元格{
公共功能显示（$ menu）{
 $ this-> ; loadModel（'Menus'）; 
 
 $ menus = $ this-> Menus-> find（’threaded’）-> where（['id'=> $ menu]）-> toArray（）; 
 
 $ menus = $ this-> buildTree（$ menus）; 
 
 $ this-> set（compact（’menus’））; 
 $ this-> set（'_ serialize'，['menus']）; 
} 
 
 //递归函数：
 
保护函数buildTree（$ menus）{
 
 foreach（$ menus as $ element） {
 
 if（！is_array（$ element））{
 $ element = $ element-> toArray（）; 
} 
 
 //每个菜单数组元素
 $ menu [’name’] = $ element [’name’]; 
 $ menu [’url’] = $ element [’url’]; 
 
 foreach（$ element as $ key => gt; $ value）{
 
 if（is_array（$ value））{
 $ menu [$ key] = $ this-> buildTree（$ value）; 
} 
 
} 
 $ resultMenu [] = $ menu; 
} 
 
 if（isset（$ resultMenu））{
 return $ resultMenu; 
} 
} 
} 
  

示例结果：

  [
（int）0 => [
‘name’=> ‘Level_1’，
‘url’=> ‘/’，
‘children’=> null 
]，
（int）1 => [
‘name’=> ‘Level_1’，
‘url’=> ‘/’，
‘children’=> [
（int）0 => [
‘name’=> ‘Level_1.1’，
‘url’=> ‘/’，
‘children’=> [
（int）0 => [
‘name’=> ‘Level_1.1.1’，
‘url’=> ‘/’，
‘children’=> null 
]，
（int）1 => [
‘name’=> ‘Level_1.1.1’，
‘url’=> ‘/’，
‘children’=> null 
] 
] 
]，
（int）1 => [
‘name’=> ‘Level_1.1’，
‘url’=> ‘/’，
‘children’=> null 
] 
] 
]，
（int）2 => [
‘name’=> ‘Level_1’，
‘url’=> ‘/’，
‘children’=> null 
]，
（int）3 => [
‘name’=> ‘Level_1’，
‘url’=> ‘/’，
‘children’=> null 
] 
] 
  

I want to use this Recursive Function to convert a php array into an array of parent and childs.

I have a this Cell:

class MenuCell extends Cell {
  public function display($menu) {
    $this->loadModel('Menus');
    $menus = $this -> Menus -> find('all', [
      'contain' => ['MenuItems']
    ]) -> where(['id' => $menu]);

    $menus = $this -> buildTree($menus);


    $this -> set(compact('menus'));
    $this -> set('_serialize', ['menus']);

  }

  public function buildTree($ar, $pid = null) {
    $op = array();
    foreach($ar as $item) {
      if ($item['parentId'] == $pid) {
        $op[$item['id']] = array(
          'name' => $item['name'],
          'parentId' => $item['parentId']
        );
        // using recursion
        $children = $this ->buildTree($ar, $item['id']);
        if ($children) {
          $op[$item['id']]['children'] = $children;
        }
      }
    }
    return $op;
  }


}

But it gives me this error:

However if i do the samething in controller, It works very fine. Any help would save my day.

解决方案

If you want create dinamic menu try this:

First check your MenusTable, your table should have field with parent id (parent_id in my example) and create relationship belongsTo, hasMany

Menus Model

class MenusTable extends Table
{

    public function initialize(array $config)
    {
        parent::initialize($config);

        $this->table('menus');
        $this->displayField('name');
        $this->primaryKey('id');

        $this->addBehavior('Timestamp');
        $this->addBehavior('Tree');

        $this->belongsTo('ParentMenus', [
            'className' => 'Menus',
            'foreignKey' => 'parent_id'
        ]);
        $this->hasMany('ChildMenus', [
            'className' => 'Menus',
            'foreignKey' => 'parent_id'
        ]);
    }

}

MenuCell

class MenuCell extends Cell {
    public function display($menu) {
        $this->loadModel('Menus');

        $menus = $this->Menus->find('threaded')->where(['id'=>$menu])->toArray();

        $menus = $this->buildTree($menus);

        $this->set(compact('menus'));
        $this->set('_serialize', ['menus']);
    }

    //Recursive function:

    protected function buildTree($menus) {

        foreach($menus as $element) {

            if(!is_array($element)) {
                $element = $element->toArray();
            }

            //Elements each menu array  
            $menu['name'] = $element['name'];
            $menu['url'] = $element['url'];

            foreach($element as $key => $value){

                if(is_array($value)) {
                    $menu[$key] = $this->buildTree($value);
                }

            }
            $resultMenu[] = $menu;
        }

        if(isset($resultMenu)) {
            return $resultMenu;
        }
    }
}

Example Result:

[
    (int) 0 => [
        'name' => 'Level_1',
        'url' => '/',
        'children' => null
    ],
    (int) 1 => [
        'name' => 'Level_1',
        'url' => '/',
        'children' => [
            (int) 0 => [
                'name' => 'Level_1.1',
                'url' => '/',
                'children' => [
                    (int) 0 => [
                        'name' => 'Level_1.1.1',
                        'url' => '/',
                        'children' => null
                    ],
                    (int) 1 => [
                        'name' => 'Level_1.1.1',
                        'url' => '/',
                        'children' => null
                    ]
                ]
            ],
            (int) 1 => [
                'name' => 'Level_1.1',
                'url' => '/',
                'children' => null
            ]
        ]
    ],
    (int) 2 => [
        'name' => 'Level_1',
        'url' => '/',
        'children' => null
    ],
    (int) 3 => [
        'name' => 'Level_1',
        'url' => '/',
        'children' => null
    ]
]   

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