Module: Mongoid::Acts::Tree::InitializerMethods

Defined in:
lib/mongoid_acts_as_tree.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_tree(options = {}) ⇒ Object 



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
 
# File 'lib/mongoid_acts_as_tree.rb', line 13

def acts_as_tree(options = {})
  options = {
    :parent_id_field => "parent_id",
    :path_field      => "path",
    :depth_field     => "depth"
  }.merge(options)

  write_inheritable_attribute :acts_as_tree_options, options
  class_inheritable_reader :acts_as_tree_options

  include InstanceMethods
  include Fields
  extend Fields
  extend ClassMethods

  field parent_id_field, :type => BSON::ObjectId
  field path_field, :type => Array,  :default => [], :index => true
  field depth_field, :type => Integer, :default => 0

  self.class_eval do
    define_method "#{parent_id_field}=" do | new_parent_id |
      if new_parent_id.present?
        new_parent = self.class.find new_parent_id

        if new_parent != self.parent # FIXME (Didier): useless when the parent remains the same
          new_parent.children.push self, false
        end
      else
        self.write_attribute parent_id_field, nil
        self[path_field] = []
        self[depth_field] = 0
      end
    end
  end

  after_save      :move_children
  validate        :will_save_tree
  before_destroy  :destroy_descendants
end