如何构建cakephp 3中存在或等于数字的规则？

问题描述

我有表条评论和列 parent_id 。

这是 CommentsTable.php 的内容：

namespace App\Model\Table;

use App\Model\Entity\Comment;
use Cake\ORM\Query;
use Cake\ORM\RulesChecker;
use Cake\ORM\Table;
use Cake\Validation\Validator;

/**
 * Comments Model
 */
class CommentsTable extends Table
{

    /**
     * Initialize method
     *
     * @param array $config The configuration for the Table.
     * @return void
     */
    public function initialize(array $config)
    {
        $this->table('comments');
        $this->displayField('id');
        $this->primaryKey('id');
        $this->belongsTo('Users', [
            'foreignKey' => 'user_id',
            'joinType' => 'INNER'
        ]);
        $this->belongsTo('Posts', [
            'foreignKey' => 'post_id',
            'joinType' => 'INNER'
        ]);
        $this->belongsTo('ParentComments', [
            'className' => 'Comments',
            'foreignKey' => 'parent_id'
        ]);
        $this->hasMany('ChildComments', [
            'className' => 'Comments',
            'foreignKey' => 'parent_id'
        ]);
    }

    /**
     * Default validation rules.
     *
     * @param \Cake\Validation\Validator $validator Validator instance.
     * @return \Cake\Validation\Validator
     */
    public function validationDefault(Validator $validator)
    {
        $validator
            ->add('id', 'valid', ['rule' => 'numeric'])
            ->allowEmpty('id', 'create')
            ->requirePresence('body', 'create')
            ->notEmpty('body')
            ->requirePresence('path', 'create')
            ->notEmpty('path')
            ->add('status', 'valid', ['rule' => 'numeric'])
            ->requirePresence('status', 'create')
            ->notEmpty('status')
            ->add('created_at', 'valid', ['rule' => 'datetime'])
            ->requirePresence('created_at', 'create')
            ->notEmpty('created_at')
            ->add('updated_at', 'valid', ['rule' => 'datetime'])
            ->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(['user_id'], 'Users'));
        $rules->add($rules->existsIn(['post_id'], 'Posts'));
        $rules->add($rules->existsIn(['parent_id'], 'ParentComments'));
        return $rules;
    }
}

我想为字段<$ c $建立规则c> parent_id ：存在于ParentComments中或等于0。

I want to build rule for field parent_id: exist in ParentComments or equal to 0.

您能帮我吗？

非常感谢。

推荐答案

规则只是可调用的函数或可调用的类。 existsIn（）函数只是 ExistsIn 类的别名。我们可以利用我们的优势：

Rules are just callable functions or callable classes. The existsIn() function is just an alias for the ExistsIn class. We can use the to our advantage:

...

use Cake\ORM\Rule\ExistsIn;
class CommentsTable extends Table
{
...
   public function buildRules(RulesChecker $rules)
    {
        ...
        $rules->add(
            function ($entity, $options) {
                $rule = new ExistsIn(['parent_id'], 'ParentComments');
                return $entity->parent_id === 1 || $rule($entity, $options);
            },
            ['errorField' => 'parent_id', 'message' => 'Wrong Parent']
        );
        return $rules;
    }
}

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