You can use the built-in Rails console script to ask any model class for its associations:
Model.reflections.keys
—For example, let’s say we have a simple iTunes-like application in which a user can have one music library that contains many tracks:
class User < ActiveRecord::Base has_one :music_library . . end
class MusicLibrary < ActiveRecord::Base belongs_to :user has_many :tracks . . end
class Track < ActiveRecord::Base belongs_to :music_library . . end
Now, firing up the Rails console and listing the associations produces the following output:
./script/console >> User.reflections.keys => [:music_library] >> MusicLibrary.reflections.keys => [:user, :tracks] >> Track.reflections.keys => [:music_library]
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