Kohana ORM:验证$ _belongs_to关系是否存在

问题描述

我正在尝试为我的一个ORM模型获得一些验证设置.

I'm trying to get some validation setup for one of my ORM models.

我有2张桌子:父母和孩子.子表中有一个名为"parent"的列，其值是父表中行的主要ID.

I have 2 tables: parent and children. In the children table, there is a column called 'parent' whose value is the primary ID of a row in the parent table.

我要做的是创建一个验证规则，以检查指定的父ID在父表中是否实际存在.

What I'm trying to do, is create a validation rule that checks the parent ID specified actually exists in the parent table.

有没有简单的方法可以做到这一点?

Is there an easy way to do this?

推荐答案

我确实提出了一种解决方案.我在Model类中创建了一个静态方法，该方法接受一个I​​D作为参数，并仅检查行是否存在.

Well I did come up with one solution. I created a static method in my Model class that accepts an ID as a parameter and just checks if the row exists.

所以我的Model_Child具有如下规则函数:

So my Model_Child has a rules function like so:

public function rules()
{
    return array(
        'parent' => array(
            // will call Model_Parent::exists($value)
            array(array('Model_Parent', 'exists'))
        )
    );
}

然后我的Model_Parent具有以下内容:

Then my Model_Parent has the following:

public static function exists($id) {
    $results = DB::select('*')->from('parent')->where('id', '=', $id)->execute()->as_array();
    if(count($results) == 0)
        return FALSE;
    else
        return TRUE;
}

这对我有用.有没有更优雅或更合适的解决方案?

This is working for me. Is there is a more elegant or proper solution?

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