I'm struggling now to get HATBM working correctly. I have a beaten scanario: articles and tags. I presume, HABTM should be used here, since it is a many-to-many relationship. I don't know however if I should manually create a join table (articles_tags in this case).
My code currently as follows:
class Article < ActiveRecord::Base has_and_belongs_to_many :tags end class Tag < ActiveRecord::Base has_and_belongs_to_many :articles end
When I run the migrations, no 3rd table is created. Also, I would like to add that my third table doesn't bear any domain logic, just blind assignment.
I'm using Rails 2.2.2
You should do this in a migration of one of the tables, or in a separate migration if those migrations have been ran:
create_table :articles_tags, :id => false do |t| t.references :article, :tag end add_index :articles_tags, [:article_id, :tag_id]
This will create the table for you and the
:id => false tells Rails not to add an id field to this table. There's an index also, which will speed up lookups for this join table.
You could also generate a model (ArticlesTag) for this and do:
# article.rb has_many :articles_tags has_many :tags, :through => :articles_tags # tag.rb has_many :articles_tags has_many :articles, :through => :articles_tags # article_tag.rb belongs_to :tag belongs_to :article
And then create the table in the migration generated from the
script/generate model articles_tag call.