try :scope option in your statement

eg:

validates :itemcode, :uniqueness => true, :scope => :user_id

read the documentation here

http://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html#method-i-validates_uniqueness_of

and section 3.10 uniqueness in

http://guides.rubyonrails.org/active_record_validations_callbacks.html

Gautam Pai

On Fri, Dec 23, 2011 at 11:57 AM, Dharmdip Rathod <[email protected]>wrote:

> Hi All,
>
> I am facing sort of problem while validating .
>
> Two models User & Product.
>
> class User < ActiveRecord::Base
>    has_many :products, :dependent => :destroy
> end
>
> class Product < ActiveRecord::Base
>    belongs_to :user
>    validates :itemcode, :uniqueness => true
> end
>
> Now case,
>
> System has number of users who can insert product information with
> itemcode
> uniqueness, but we need uniqueness validation with user_id and
> itemcode.System need to check join table validation for new item with
> user_id and itemcode.
>
> Please suggest.
>
> Thanks.
>
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