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Versions: 4
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Stored size: 1.45 KB
Contents
require 'dm-core/type'
module DataMapper
module Types
class Discriminator < Type
primitive Class
default lambda { |resource, property| resource.model }
required true
# @api private
def self.bind(property)
repository_name = property.repository_name
model = property.model
property_name = property.name
model.default_scope(repository_name).update(property_name => model.descendants)
model.class_eval <<-RUBY, __FILE__, __LINE__ + 1
extend Chainable
extendable do
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(repository_name).discriminator
model = discriminator.typecast(args.first[discriminator.name])
if model.kind_of?(Model) && !model.equal?(self)
return model.new(*args, &block)
end
end
super
end
private
def set_discriminator_scope_for(model)
model.default_scope(#{repository_name.inspect}).update(#{property_name.inspect} => model.descendants)
end
end
RUBY
end
end # class Discriminator
end # module Types
end # module DataMapper
Version data entries
4 entries across 4 versions & 1 rubygems