Mongoid List

Mongoid List uses a position column to maintain an ordered list, with optional scoping. It uses atomic updates to keep lists in either a Collection or Embedded in sync.

Installation

Add to your Gemfile:

gem 'mongoid-list'

Usage

Add a list:

class CrowTRobot
  include Mongoid::Document
  include Mongoid::List

  lists

end

Available methods:

# Update Position

doc1.position  # => 1
doc2.position  # => 2

doc1.position = 2
doc1.save

doc1.position  # => 2
doc2.position  # => 1


# Reorder a Full List
Klass.update_positions_in_list!(elements)

Pass in all elements in new ordering.  Accepts documents or ids.

# Scope Information
doc.list_scoped?        # If scoping has been defined
doc.list_scope_field        # Which field to scope against
doc.list_scope_value        # Value of the scoping field
doc.list_scope_conditions   # Additional query conditions for scoped lists.

Scoping

To scope the list, pass :scope on lists definition:

class TomServo
  include Mongoid::Document
  include Mongoid::List

  lists scope: :satellite_of_love_id
  belongs_to :satellite_of_love

end

TO-DO

• Helper methods to move individual documents within the list.
• Customizable filed name.