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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 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) click to toggle source

Initialize the subclasses instance variable for the model.

# File lib/sequel/plugins/subclasses.rb, line 29
def self.apply(model, &block)
  model.instance_variable_set(:@subclasses, [])
  model.instance_variable_set(:@on_subclass, block)
end

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