I have something like that:
class Commercial < ActiveRecord::Base
belongs_to :announcer
has_many :tags, :as=> :taggable
end
class Announcer < ActiveRecord::Base
has_many :commercials
has_many :tags, :as=> :taggable
end
class Tag < ActiveRecord::Base
belongs_to :taggable, :polymorphic => true
end
with commercials (id,name)
announcers(id,name)
tags(id,name,taggable_id,taggable_type)
now that's not very DRY because I have several tags that repeat
themselves for different taggable_type.
is there a better way to deal with that?
thanx in advance
Pat
eden_li
May 3, 2007, 2:25am
2
You could turn tags into an intermediate join table on a "tag details"
class -- although after typing it out it looks pretty ugly. You don't
save that much unless your name column is going to be huge or unless
you're going to store more information per tag (e.g. create date,
counter caches etc).
Schema:
tags(id, taggable_id, taggable_type)
tag_details(tag_id, name)
class Tag < ActiveRecord::Base
belongs_to :taggable, :polymorphic => true
has_one :tag_detail, :dependent => :destroy
def name
tag_detail.name
end
def name=(v)
tag_detail.name = v
end
def ensure_tag_detail
create_tag_detail
end
after_validation_on_create :ensure_tag_detail
end
class TagDetail < ActiveRecord::Base
belongs_to :tag
end
ok thanx, I think I'll stay with the first simple polymorphism solution.
