module Sequel::Plugins::Subclasses
The Subclasses plugin keeps track of all subclasses of the current model class. Direct subclasses are available via the subclasses method, and all descendent classes are available via the descendents method:
c = Class.new(Sequel::Model) c.plugin :subclasses sc1 = Class.new(c) sc2 = Class.new(c) ssc1 = Class.new(sc1) c.subclasses # [sc1, sc2] sc1.subclasses # [ssc1] sc2.subclasses # [] ssc1.subclasses # [] c.descendents # [sc1, ssc1, sc2]
You can also finalize the associations and then freeze the classes in all descendent classes. Doing so is a recommended practice after all models have been defined in production and testing, and this makes it easier that keeping track of the classes to finalize and freeze manually:
c.freeze_descendants
You can provide a block when loading the plugin, and it will be called with each subclass created:
a = [] Sequel::Model.plugin(:subclasses){|sc| a << sc} class A < Sequel::Model; end class B < Sequel::Model; end a # => [A, B]
Public Class Methods
apply(model, &block)
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Initialize the subclasses instance variable for the model.
# File lib/sequel/plugins/subclasses.rb, line 39 def self.apply(model, &block) model.instance_variable_set(:@subclasses, []) model.instance_variable_set(:@on_subclass, block) end