Module: Mongokit::AutoIncrement::ClassMethods

Defined in:
lib/mongokit/auto_increment.rb

Instance Method Summary collapse

Instance Method Details

#auto_increment(attribute, _options = {}) ⇒ Object

Example

class Order
  include Mongoid::Document
  mongokit :auto_increment

  auto_increment :order_count,
  auto_increment :order_no, pattern: "%Y%m#####"  # Default numner symbol is #
end

order = Order.create
order.order_count  # 1
order.order_no     # 20150500001



30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
 
# File 'lib/mongokit/auto_increment.rb', line 30

def auto_increment(attribute, _options = {})
  options = {
    number_symbol: '#',
    start:  0,
    step: 1
  }

  options.merge!(_options)
  options[:attribute] = attribute
  options[:model] = self
  options[:type] ||= Integer

  if options[:pattern]
    options[:time_format] = Mongokit::Counter.to_time_format(options[:pattern])
    options[:type] = String
  end

  field(attribute, type: options[:type])

  # create new record in counter collection
  Models::AutoIncrementCounter.find_or_create_with_seed(options)

  after_create do |doc|
    doc.set(attribute => Mongokit::Counter.next(options))
  end

  define_method("reserve_#{attribute}!") do
    set(attribute => Mongokit::Counter.next(options))
  end

  define_method("current_#{attribute}_counter") do
    Models::AutoIncrementCounter.current_counter(options)
  end
end