lib/mongoid/persistable/incrementable.rb
# encoding: utf-8
module Mongoid
module Persistable
# Defines behaviour for $inc operations.
#
# @since 4.0.0
module Incrementable
extend ActiveSupport::Concern
# Increment the provided fields by the corresponding values. Values can
# be positive or negative, and if no value exists for the field it will
# be set with the provided value.
#
# @example Increment the fields.
# document.inc(score: 10, place: 1, lives: -10)
#
# @param [ Hash ] increments The field/inc increment pairs.
#
# @return [ Document ] The document.
#
# @since 4.0.0
def inc(increments)
prepare_atomic_operation do |ops|
process_atomic_operations(increments) do |field, value|
increment = value.__to_inc__
current = attributes[field]
attributes[field] = (current || 0) + increment
ops[atomic_attribute_name(field)] = increment
end
{ "$inc" => ops }
end
end
end
end
end