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View Arel Multi-join example.rb
# The problem: In your Rails 3 project, you have a model Request that models a
# user's request for content related to a specific problem or topic. The user
# can tag her request with any number of words. These are modeled by a Tag class
# backed by a tags DB table. Since you want unique records per tag, you have a
# Tagging class backed by a taggings table. Taggings is a a many-to-many table
# with some additional information. Also, other models in the application
# besides requests can be tagged: The Tagging class defines a polymorphic
# relationship "taggable" with those models.
# So pretty soon you want to look up all the requests that are tagged with
You can’t perform that action at this time.