ActiveRecord::Null

Create null objects for ActiveRecord models.

Install the gem and add to the application's Gemfile by executing:

$ bundle add activerecord-null

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install activerecord-null

Extend your primary abstract class with ActiveRecord::Null.

class ApplicationRecord < ActiveRecord::Base
  primary_abstract_class
  extend ActiveRecord::Null
end

Define a null object for the model.

class User < ApplicationRecord
  has_many :posts
  Null do
    def name = "None"
  end
end

This will create a Singleton class User::Null that mimics the User class.

Use the null object.

User.null

It will even work with associations.

User.null.posts # => []

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Run rake build:checksum to build the gem and generate the checksum. This will also update the version number in the gemspec file.

Run rake release to create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

This will leave a new commit with the version number incremented in the version file and the changelog updated with the new version. Push the changes to the repository.

This gem is managed with Reissue.

Bug reports and pull requests are welcome on GitHub at https://github.com/SOFware/activerecord-null.