有没有轨道路的方式来验证实际的记录是唯一的,不只是一个列?例如,友谊型号/表不应该能够有多个相同的记载,如:
USER_ID:10 | friend_id:20
USER_ID:10 | friend_id:20
解决方案
您可以范围 validates_uniqueness_of
呼叫如下。
validates_uniqueness_of:USER_ID,:范围=> :friend_id
Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
user_id: 10 | friend_id: 20
user_id: 10 | friend_id: 20
解决方案
You can scope a validates_uniqueness_of
call as follows.
validates_uniqueness_of :user_id, :scope => :friend_id