Ruby on Rails

Hi all,


Say I have an article class that has one main tag, but can also be
associated with multiple secondary tags. Something like schema listed
below. How can I implement the scope method below?


Basically I want one method where I can return ALL articles related to a
tag, regardless of whether it is a primary tag relationship or secondary
tag relationship.


Many Thanks!


class Article < ActiveRecord::Base
belongs_to :primary_tag,
:class_name => "Tag"

has_many :secondary_tag_listings

has_many :secondary_tags,
:through => :secondary_tag_listings,
:class_name => "Tag"

scope :all_with_tag, lambda { |tag_name|
# TODO: how to find all with either primary OR secondary tags
# as tag_name?
}
end




class SecondaryTagListings < ActiveRecord::Base
belongs_to :article
belongs_to :tag
end




class Tag < ActiveRecord::Base
has_many :primary_articles,
:class_name => "Article"

has_many :secondary_tag_listings

has_many :secondary_articles,
:through => :secondary_tag_listings,
:class_name => "Article"
end

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