Module: IdentityMap::ClassMethods

Defined in:
lib/projectile/identity_map.rb

Instance Method Summary collapse

Instance Method Details

#[](x) ⇒ Object 



9
10
11
 
# File 'lib/projectile/identity_map.rb', line 9

def [](x)
  self.identity_map[x]
end

#establish_identity_on(attr_name) ⇒ Object 



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
 
# File 'lib/projectile/identity_map.rb', line 17

def establish_identity_on(attr_name)
  define_method("==") do |other|
    return false unless self.is_a?(other.class)
    self.send(attr_name) == other.send(attr_name)
  end

  metaclass.instance_eval do
    define_method("merge_or_insert") do |json|
      return nil unless json
      attribute = self.get_attributes.find {|a| a[:name] == attr_name}
      key_path = attribute[:key_path]
      identity_key = json.valueForKeyPath(key_path)
      return nil unless identity_key
      new_model = self.new json
      old_model = self.identity_map[identity_key]
      if old_model
        old_model.merge_with_model(new_model)
      else
        self.identity_map[identity_key] = new_model
      end
      (old_model || new_model)
    end
  end

end

#identity_map ⇒ Object 



43
44
45
 
# File 'lib/projectile/identity_map.rb', line 43

def identity_map
  @identity_map ||= Hash.new
end

#metaclass ⇒ Object 



13
14
15
 
# File 'lib/projectile/identity_map.rb', line 13

def metaclass
  class << self; self; end
end