Ruby-on-rails rails 3 验证多个属性的唯一性
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rails 3 validation on uniqueness on multiple attributes
提问by denisjacquemin
I use Rails 3.0.0.beta4
我使用 Rails 3.0.0.beta4
I want to add a validation on uniqueness on two attributes, that means that my model is valid if the couple of 'recorded_at'and 'zipcode'is unique.
我想对两个属性的唯一性添加验证，这意味着如果'recorded_at'和'zipcode'是唯一的，我的模型是有效的。
On one attribute here is the syntax
这里的一个属性是语法
validates :zipcode, :uniqueness => true
thanks
谢谢
回答by Christian Lescuyer
In Rails 2, I would have written:
在 Rails 2 中，我会这样写：
validates_uniqueness_of :zipcode, :scope => :recorded_at
In Rails 3:
在 Rails 3 中：
validates :zipcode, :uniqueness => {:scope => :recorded_at}
For multiple attributes:
对于多个属性：
validates :zipcode, :uniqueness => {:scope => [:recorded_at, :something_else]}
回答by Ray
Multiple Scope Parameters:
多个范围参数：
class TeacherSchedule < ActiveRecord::Base
validates_uniqueness_of :teacher_id, :scope => [:semester_id, :class_id]
end
http://apidock.com/rails/ActiveRecord/Validations/ClassMethods/validates_uniqueness_of
http://apidock.com/rails/ActiveRecord/Validations/ClassMethods/validates_uniqueness_of
This should answer Greg's question.
这应该可以回答 Greg 的问题。
回答by Jesus
Dont work for me, need to put scopein plural
我不工作，需要把范围在复数
validates_uniqueness_of :teacher_id, :scopes=> [:semester_id, :class_id]
validates_uniqueness_of :teacher_id, :scope s=> [:semester_id, :class_id]
