Statesman::Trigger

This is an extension to the fantastic Statesman gem to create a database trigger to keep the most recent transition in sync on a specific column on the parent model.

Presently, it is only designed to work with PostgreSQL.

Add this line to your application's Gemfile:

gem 'statesman-trigger'

And then execute:

$ bundle

Or install it yourself as:

$ gem install statesman-trigger

Usage in a rails migration is straightforward, assuming you use the defaults:

def change
  add_column :orders, :current_state, :string, null: false, default: 'pending', index: true

  create_statesman_trigger Order, OrderTransition
end

The migration script will introspect from the provided classes.

If you want your column to be named something else:

def change
  add_column :orders, :anything_you_want, :string, null: false, default: 'pending', index: true

  create_statesman_trigger Order, OrderTransition, sync_column: :anything_you_want
end

It is highly recommended you switch your Rails application's schema dumping format to SQL (db/structure.sql rather than db/schema.rb). That's accomplished by the following line in config/application.rb:

module YourAppHere
  class Application < Rails::Application
    # Use SQL for dumping.
    config.active_record.schema_format = :sql
  end
end

After checking out the repo, run bin/setup to install dependencies. Then, 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 to create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

1. Fork it ( https://github.com/scryptmouse/statesman-trigger/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request