yii2 - 如何在ActiveRecord(Yii2)中为多个字段设置唯一性？

Question

如何在ActiveRecord(Yii2)中为多个字段设置唯一性？
我已经尝试过手动编写

['a1', 'unique', 'targetAttribute' => ['a1', 'a2']]

但这是行不通的。

Answer 1

从文档:

// a1 needs to be unique
['a1', 'unique']
// a1 needs to be unique, but column a2 will be used to check the uniqueness of the a1 value
['a1', 'unique', 'targetAttribute' => 'a2']
// a1 and a2 need to be unique together, and they both will receive error message
[['a1', 'a2'], 'unique', 'targetAttribute' => ['a1', 'a2']]
// a1 and a2 need to be unique together, only a1 will receive error message
['a1', 'unique', 'targetAttribute' => ['a1', 'a2']]
// a1 needs to be unique by checking the uniqueness of both a2 and a3 (using a1 value)
['a1', 'unique', 'targetAttribute' => ['a2', 'a1' => 'a3']]