Validates_uniqueness_of question

Rails
1

Given three models: a design model, a votes model, and a users model
the problem is a user can only vote for a design once.

If I do a validates_uniqueness_of :user in the votes model that means
a user can only vote once, period. What I want is to say a user can
only vote for a single design once. Anyone know the best way to do
this? Thanks.

JB

2

JB, I think you would need to use a scope, for example:

validates_uniqueness_of :user_id, :scope => :design_id