Module: PropertySets::ActiveRecordExtension::ClassMethods

Defined in:
lib/property_sets/active_record_extension.rb

Constant Summary collapse

RAILS6 = 
ActiveRecord::VERSION::MAJOR >= 6

Instance Method Summary collapse

Instance Method Details

#property_set(association, options = {}, &block) ⇒ Object 



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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
 
# File 'lib/property_sets/active_record_extension.rb', line 11

def property_set(association, options = {}, &block)
  unless include?(PropertySets::ActiveRecordExtension::InstanceMethods)
    self.send(:prepend, PropertySets::ActiveRecordExtension::InstanceMethods)
    cattr_accessor :property_set_index
    self.property_set_index = Set.new
  end

  raise "Invalid association name, letters only" unless association.to_s =~ /[a-z]+/
  exists = property_set_index.include?(association)

  self.property_set_index << association

  # eg AccountSetting - this IS idempotent
  property_class = PropertySets.ensure_property_set_class(
    association,
    options.delete(:owner_class_name) || self.name
  )

  # eg property :is_awesome
  property_class.instance_eval(&block) if block

  tb_name = options.delete :table_name
  property_class.table_name = tb_name if tb_name

  hash_opts = {
    :class_name => property_class.name,
    :autosave => true,
    :dependent => :destroy,
    :inverse_of => self.name.demodulize.underscore.to_sym,
  }.merge(options)

  # TODO: should check options are compatible? warn? raise?
  reflection = self.reflections[association.to_s] # => ActiveRecord::Reflection::HasManyReflection
  reflection.options.merge! options if reflection && !options.empty?

  unless exists then # makes has_many idempotent...
    has_many association, **hash_opts do
      # keep this damn block! -- creates association_module below
    end
  end

  # eg 5: AccountSettingsAssociationExtension
  # eg 6: Account::SettingsAssociationExtension

  # stolen/adapted from AR's collection_association.rb #define_extensions

  module_name = "#{association.to_s.camelize}AssociationExtension"
  module_name = name.demodulize + module_name unless RAILS6

  target = RAILS6 ? self : self.parent
  association_module = target.const_get module_name

  association_module.module_eval do
    include PropertySets::ActiveRecordExtension::AssociationExtensions

    property_class.keys.each do |key|
      raise "Invalid property key #{key}" if self.respond_to?(key)

      # Reports the coerced truth value of the property
      define_method "#{key}?" do
        type  = property_class.type(key)
        value = lookup_value(type, key)
        ![ "false", "0", "", "off", "n" ].member?(value.to_s.downcase)
      end

      # Returns the value of the property
      define_method "#{key}" do
        type = property_class.type(key)
        lookup_value(type, key)
      end

      # Assigns a new value to the property
      define_method "#{key}=" do |value|
        instance = lookup(key)
        instance.value = PropertySets::Casting.write(property_class.type(key), value)
        instance.value
      end

      define_method "#{key}_record" do
        lookup(key)
      end
    end

    define_method :property_serialized? do |key|
      property_class.type(key) == :serialized
    end
  end
end