Validates_uniqueness_of with habtm

Rails
1

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

2

Les N. wrote:

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

3

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