Problem building relationships between models
- by Brian Roisentul
Until now, I've been using acts_as_taggable_on plugin for tagging announcements.
That plugin creates the following tables:
taggings: relates tags and announcements table(for the tagged item, it has a field called taggable_id, which I rename to "announcement_id" for what I'll explain below).
tags: has the tag ids and names.
The other day, I discovered that I had no way of getting the announcements tagged with a certain tag, but doing Announcement.tagged_with(tag_name), and I don't want to search by name, but for id.
So, as I'm using almost nothing of the functionality in that plugin, I decided to create the models for taggings and tags tables, to accomplish this: Announcement.tags.
The models' relationships look as following:
class Tagging < ActiveRecord::Base
belongs_to :announcement
belongs_to :tag
end
class Tag < ActiveRecord::Base
has_many :announcements, :through => :taggings
end
class Announcement < ActiveRecord::Base
has_many :tags, :through => :taggings
Why can't I execute the command Announcement.tags? Because when I try, I get
undefined method `tags'
