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class Tag
has_many :taggings
named_scope :important, :include => { :taggings => :important }
end
class Tagging
belongs_to :tag
belongs_to :posts
# uses a string 'flag' column but could be changed to a boolean important
# column later, hence the need to encapsulate!
named_scope :important, :conditions => {:flag => 'important'}
end
class Post
has_many :taggings
has_many :tags, :through => :taggings, :source => :tag
end
# post.tags.important
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