Rails - Apr 2006 - validates_uniqueness_of with habtm

it''s a blog...

class Entry < ActiveRecord::Base
  has_and_belongs_to_many :categories
end

similarly:

class Category < ActiveRecord::Base
  has_and_belongs_to_many :entries
end

I wish to make sure that the owner doesn''t add the same category to a 
given entry more than once... I''m thinking that validates_uniqueness_of
should be usable here. But can''t figure out how to include it.

ideas?

thanks

-- 
Posted via http://www.ruby-forum.com/.

Les Nightingill wrote:
> it''s a blog...
>
> class Entry < ActiveRecord::Base
>   has_and_belongs_to_many :categories
> end
>
> similarly:
>
> class Category < ActiveRecord::Base
>   has_and_belongs_to_many :entries
> end
>
> I wish to make sure that the owner doesn''t add the same category
to a
> given entry more than once... I''m thinking that
validates_uniqueness_of
> should be usable here. But can''t figure out how to include it.
>
> ideas?
>   
Here''s one way...

entry.categories << category unless entry.categories.include?(category)

not sure if that''s what you''re looking for..
--
Bryan Buecking

Bryan Buecking wrote:
> Here''s one way...
> 
> entry.categories << category unless
entry.categories.include?(category)
> 
> not sure if that''s what you''re looking for..
> --
> Bryan Buecking
That''ll work well, Bryan, I had something similar but not as clean. I 
was trying to see if there was a way to use validates_uniqueness_of. I 
guess not though, because I''m sure you would''ve spotted it.

thanks for taking the time to help, Bryan

Les

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