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Contents
require 'ardm/property/class'
module Ardm
class Property
class Discriminator < Class
load_as ::Class
dump_as ::String
default lambda { |resource, property| resource.class }
required true
# ActiveRecord just stores the string name of the class.
# We dump false for a bad value because it results in a
# class that isn't in the "dump_as".
#
# Expects the class name to be a valid class name that is
# loaded and available.
def dump(value)
dumped = typecast(value)
dumped.name if dumped.is_a?(::Class)
end
def load(value)
typecast(value)
end
# @api private
def bind
model.inheritance_column = field
model.extend Model unless model < Model
end
module Model
def inherited(model)
super # setup self.descendants
#set_discriminator_scope_for(model)
end
def new(*args, &block)
if args.size == 1 && args.first.kind_of?(Hash)
discriminator = properties.discriminator
if discriminator_value = args.first[discriminator.name]
model = discriminator.typecast(discriminator_value)
if model.kind_of?(Model) && !model.equal?(self)
return model.new(*args, &block)
end
end
end
super
end
private
def set_discriminator_scope_for(model)
discriminator = self.properties.discriminator
model.scoped.with_default_scope.update_all(discriminator.field => model.descendants.dup << model)
rescue ::ActiveRecord::ConnectionNotEstablished => e
puts "Error was raised but it seems to be an ActiveRecord 3.2 error, fixed in 4:\n#{e}"
end
end
end # class Discriminator
end # class Property
end # module Ardm
Version data entries
15 entries across 15 versions & 1 rubygems