Some help please!!
class Article < ActiveRecord::Base
has_and_belongs_to_many :tags, :join_table => :articles_tags_users
has_and_belongs_to_many :users, :join_table => :articles_tags_users
end
class Tag < ActiveRecord::Base
has_and_belongs_to_many :articles, :join_table => :articles_tags_users
has_and_belongs_to_many :users, :join_table => :articles_tags_users
end
class User < ActiveRecord::Base
has_and_belongs_to_many :articles, :join_table => :articles_tags_users
has_and_belongs_to_many :tags, :join_table => :articles_tags_users
end
then in the controller
user = User.new
tag = Tag.find(id)
article = Article.find(id)
user.tag << tag
user.article << article
all this creates 2 tuples on the database articles_tags_users instead of
one
with all the values
Do somebody knows how to do this?
Thanks !
Felipe V. Contesse
IngenierÃa Civil Industrial UC
Some help please!!
class Article < ActiveRecord::Base
has_and_belongs_to_many :tags, :join_table => :articles_tags_users
[…]
user = User.new
tag = Tag.find(id)
article = Article.find(id)
user.tag << tag
user.article << article
all this creates 2 tuples on the database articles_tags_users instead of one
with all the values
Do somebody knows how to do this?
I hope someone will correct me if I’m wrong, but I believe you will
need to use has_many :through for this case – HABTM isn’t meant for 3-
way joins as far as I know. You’ll need something like this:
class Article < ActiveRecord::Base
has_many :correlations
has_many :tags, :through => :correlations
has_many :users, :through => :correlations
end
(similarly for User and Tag)
class Correlation < ActiveRecord::Base
belongs_to :article
belongs_to :tag
belongs_to :user
end
Then your sample controller code would become something like
user = User.new
tag = Tag.find(id)
article = Article.find(id)
user.correlations << Correlation.new(:tag => tag, :article => article)