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README.rdoc

Mongoid::AutoIncrement

Add SQL like auto-incrementing fields to your Mongoid documents. This gem is inspired by ihswebdesign.com/blog/autoincrement-in-mongodb-with-ruby/ and the mongomapper_id2 gem.

Installation

Add to Gemfile:

gem 'mongoid_auto_increment'

Getting Started

Just add auto_increment :field to your Mongoid model where :field is the name of the auto-incremented field you want to create. Example:

class Book
  include Mongoid::Document

  field :title
  field :author

  auto_increment :sequence
end

auto_increment :sequence will create a field of type Integer named sequence for Book. Whenever an instance of the model is created (intially saved to mongoDB), the auto_increment field will automatically be set to the next number in the sequence.

You can add more than one auto-incremented field per model.

Options

auto_increment :sequence, collection: :some_collection

mongoid_auto_inc keeps track of the current number in the sequence by creating a separate document mongoDB to query and update. By default auto_increment will save this document to a mongoDB collection called sequences. If you wish to save to a different collection use the :collection option to specify its name.

auto_increment :sequence, step: 5

If desired, you can override the :step, or increment amount (default is 1).

auto_increment :sequence, seed: 3333

Use the :seed option to set the initial value of the auto-incremented field. The first number assigned from the sequence will be the next number after the seed value (including the step - so for seed: 1000, step: 5, first value will be 1005).

auto_increment :sequence, scope: :some_field_or_relation
auto_increment :sequence, scope: [ :some_field_or_relation, :another_field_or_relation ]

Use the :scope option to scope an auto-incremented field to a query. Similar to Mongoid, the scope may contain one or many fields or relations. Each unique scope will result in it's own stream of incremented values.

Contributing to Mongoid::AutoIncrement

  • Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet

  • Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it

  • Fork the project

  • Start a feature/bugfix branch

  • Commit and push until you are happy with your contribution

  • Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.

  • Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

Support us

© 2011-2018 Peter Savichev (proton) © 2010-2011 Jeff Smith

See LICENSE.txt for further details.

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Add an auto incrementing field to your Mongoid::Document

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