I use 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.
On one attribute here is the syntax
validates :zipcode, :uniqueness => true
thanks
This question is related to
ruby-on-rails
validation
In Rails 2, I would have written:
validates_uniqueness_of :zipcode, :scope => :recorded_at
In Rails 3:
validates :zipcode, :uniqueness => {:scope => :recorded_at}
For multiple attributes:
validates :zipcode, :uniqueness => {:scope => [:recorded_at, :something_else]}
Dont work for me, need to put scope in plural
validates_uniqueness_of :teacher_id, :scopes => [:semester_id, :class_id]
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
This should answer Greg's question.
Source: Stackoverflow.com