有没有办法使用 Laravel 的验证语法来验证外键？
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Is there any way to validate a foreign key using Laravel's Validation syntax?
提问by ReactingToAngularVues
Say I have an objectwhich relates to a mission. Users can upload objects and say that it has a relationship with one of these missions. Is there anyway to check that the mission_idthat the user has selected for this object actually exists in this database using Laravel's Validationclass and rules?
假设我有一个object与 a 相关的mission. 用户可以上传对象并说它与这些任务之一有关。无论如何要mission_id使用 Laravel 的Validation类和规则来检查用户为此对象选择的对象是否确实存在于该数据库中？
This way, I can check that mission_idis not only an integer, but also exists in the database.
这样，我可以检查它mission_id不仅是一个整数，而且还存在于数据库中。
For example, I guess I'm looking for something like:
例如，我想我正在寻找类似的东西：
$rules = array(
'mission_id' => 'foreignKeyExistsInMissions|integer'
)
Where foreignKeyExistsInMissionsis the validation rule I'm looking for.
foreignKeyExistsInMissions我正在寻找的验证规则在哪里。
