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Contents
module Sequel
module Plugins
# 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]
module Subclasses
# Initialize the subclasses instance variable for the model.
def self.apply(model)
model.instance_variable_set(:@subclasses, [])
end
module ClassMethods
# All subclasses for the current model. Does not
# include the model itself.
attr_reader :subclasses
# All descendent classes of this model.
def descendents
Sequel.synchronize{_descendents}
end
# Add the subclass to this model's current subclasses,
# and initialize a new subclasses instance variable
# in the subclass.
def inherited(subclass)
super
Sequel.synchronize{subclasses << subclass}
subclass.instance_variable_set(:@subclasses, [])
end
private
# Recursive, non-thread safe version of descendents, since
# the mutex Sequel uses isn't reentrant.
def _descendents
subclasses.map{|x| [x] + x.send(:_descendents)}.flatten
end
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems