Module: Mongoid::Tree::ClassMethods

Defined in:

lib/mongoid/tree.rb

Overview

This module includes those methods documented above

Instance Method Summary

• #leaves ⇒ Object
• #root ⇒ Object

  :nodoc:.

• #roots ⇒ Object

Instance Method Details

#leaves ⇒ Object

# File 'lib/mongoid/tree.rb', line 129

def leaves
  where(:_id.nin => only(:parent_id).collect(&:parent_id))
end

#root ⇒ Object

:nodoc:

# File 'lib/mongoid/tree.rb', line 121

def root
  first(:conditions => { :parent_id => nil })
end

#roots ⇒ Object

# File 'lib/mongoid/tree.rb', line 125

def roots
  where(:parent_id => nil)
end