Module: DataMapper::Associations::OneToOne

Extended by:
DataMapper::Assertions
Defined in:
lib/dm-core/associations/one_to_one.rb

Class Method Summary collapse

Methods included from DataMapper::Assertions

assert_kind_of

Class Method Details

.setup(name, model, options = {}) ⇒ 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.

Setup one to one relationship between two models -



9
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
46
47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'lib/dm-core/associations/one_to_one.rb', line 9

def self.setup(name, model, options = {})
  assert_kind_of 'name',    name,    Symbol
  assert_kind_of 'model',   model,   Model
  assert_kind_of 'options', options, Hash

  repository_name = model.repository.name

  model.class_eval "    def \#{name}\n      \#{name}_association.first\n    end\n\n    def \#{name}=(child_resource)\n      \#{name}_association.replace(child_resource.nil? ? [] : [ child_resource ])\n    end\n\n    private\n\n    def \#{name}_association\n      @\#{name}_association ||= begin\n        unless relationship = model.relationships(\#{repository_name.inspect})[:\#{name}]\n          raise ArgumentError, \"Relationship \#{name.inspect} does not exist in \\\#{model}\"\n        end\n        association = Associations::OneToMany::Proxy.new(relationship, self)\n        parent_associations << association\n        association\n      end\n    end\n  EOS\n\n  model.relationships(repository_name)[name] = if options.has_key?(:through)\n    RelationshipChain.new(\n      :child_model              => options.fetch(:class_name, Extlib::Inflection.classify(name)),\n      :parent_model             => model,\n      :repository_name          => repository_name,\n      :near_relationship_name   => options[:through],\n      :remote_relationship_name => options.fetch(:remote_name, name),\n      :parent_key               => options[:parent_key],\n      :child_key                => options[:child_key]\n    )\n  else\n    Relationship.new(\n      name,\n      repository_name,\n      options.fetch(:class_name, Extlib::Inflection.classify(name)),\n      model,\n      options\n    )\n  end\nend\n", __FILE__, __LINE__