Tag Archives: :scope

Ensuring your join model uniqueness

by fadhli on 22. Jul, 2008 in Programming, Rails

For example: id |category_id | inventory_id 1 384 1 #first entry 2 384 2 #this would be ok. 3 384 1 #this would not be ok To ensure that a category_id doesn’t have any inventory_id duplicate: [sourcecode language="ruby"] class CategoryProduct < ActiveRecord::Base   belongs_to :category   belongs_to :inventory   validates_uniqueness_of :category_id, :scope => :inventory_id end [...]

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