Class: DataMapper::Property::Discriminator

Inherits:
Class show all
Includes:
PassThroughLoadDump
Defined in:
lib/dm-core/property/discriminator.rb

Constant Summary

Constants inherited from DataMapper::Property

INVALID_NAMES, OPTIONS, PRIMITIVES, VISIBILITY_OPTIONS

Instance Attribute Summary

Attributes inherited from DataMapper::Property

#allow_blank, #allow_nil, #default, #index, #instance_variable_name, #model, #name, #options, #primitive, #reader_visibility, #repository_name, #required, #unique_index, #writer_visibility

Instance Method Summary collapse

Methods included from PassThroughLoadDump

#dump, #load

Methods inherited from Class

#typecast_to_primitive

Methods inherited from Object

#dump, #load, #to_child_key

Methods inherited from DataMapper::Property

accept_options, accepted_options, #allow_blank?, #allow_nil?, #assert_valid_options, demodulized_names, descendants, determine_class, #determine_visibility, #field, find_class, #get, #get!, inherited, #initialize, #inspect, #key?, #lazy?, #lazy_load, #lazy_load_properties, #loaded?, nullable, options, #primitive?, #properties, #required?, #serial?, #set, #set!, #typecast, #unique?, #valid?

Methods included from Chainable

#chainable, #extendable

Methods included from Equalizer

#equalize

Methods included from Deprecate

#deprecate

Methods included from Subject

#default?, #default_for

Methods included from Assertions

#assert_kind_of

Constructor Details

This class inherits a constructor from DataMapper::Property

Instance Method Details

#bind ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/dm-core/property/discriminator.rb', line 10

def bind
  model.default_scope(repository_name).update(name => model.descendants.dup << model)

  model.class_eval "    extend Chainable\n\n    extendable do\n      def inherited(model)\n        super  # setup self.descendants\n        set_discriminator_scope_for(model)\n      end\n\n      def new(*args, &block)\n        if args.size == 1 && args.first.kind_of?(Hash)\n          discriminator = properties(repository_name).discriminator\n\n          if discriminator_value = args.first[discriminator.name]\n            model = discriminator.typecast_to_primitive(discriminator_value)\n\n            if model.kind_of?(Model) && !model.equal?(self)\n              return model.new(*args, &block)\n            end\n          end\n        end\n\n        super\n      end\n\n      private\n\n      def set_discriminator_scope_for(model)\n        model.default_scope(\#{repository_name.inspect}).update(\#{name.inspect} => model.descendants.dup << model)\n      end\n    end\n  RUBY\nend\n", __FILE__, __LINE__ + 1