Module: Mongoid::Persistable::Multipliable

Extended by:
ActiveSupport::Concern
Included in:
Mongoid::Persistable
Defined in:
lib/mongoid/persistable/multipliable.rb

Overview

Defines behavior for $mul operations.

Instance Method Summary collapse

Instance Method Details

#mul(factors) ⇒ Document

Multiply 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 to zero.

Examples:

Multiply the fields.

document.mul(score: 10, place: 1, lives: -10)

Parameters:

  • factors (Hash) —

    The field/factor multiplier pairs.

Returns:



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# File 'lib/mongoid/persistable/multipliable.rb', line 21

def mul(factors)
  prepare_atomic_operation do |ops|
    process_atomic_operations(factors) do |field, value|
      factor = value.__to_inc__
      current = attributes[field]
      new_value = (current || 0) * factor
      process_attribute field, new_value if executing_atomically?
      attributes[field] = new_value
      ops[atomic_attribute_name(field)] = factor
    end
    { "$mul" => ops } unless ops.empty?
  end
end