Kwork

Kwork is a library for building business transactions in Ruby designed to:

• Be written in a declarative and chainable way.
• Decouple individual operations from business transactions.
• Injecting operations for testing purposes or reusability.
• Be used with different result types (e.g. Kwork::Result, Dry::Monads::Result, Dry::Monads::Maybe...).
• Provide transactional safety for different database adapters (e.g., ROM, ActiveRecord...).

Installation

Add this line to your application's Gemfile:

gem 'kwork', github: 'waiting-for-dev/kwork'

And then execute:

$ bundle install

Usage

Using dry-auto_inject & dry-monads.

require "kwork"

class CheckOutOrder
  include Kwork[adapter: :result]
  include Deps[:update_line_items, :update_order, :calculate_best_prices, :enqueue_order_completed_email]
  
  def call(order_id, attrs)
    attrs = step validate(attrs)
    line_items = step update_line_items.(order_id, attrs[:line_items])
    order = step update_order.(order_id, attrs.except(:line_items))
    
    step calculate_best_prices.(order:, line_items:)
    step enqueue_order_completed_email.(order)
    
    success(order)
  end
  
  private
  
  def validate(attrs)
    # ...
  end
end

include Dry::Monads[:result]

case CheckoutOrder.new
in Success[message]
  puts message
in Failure[error]
  puts error
end

Advanced usage

You can leverage transactable to elegantly use the Railway pattern for data transformation or the whole transactional workflow. For now, it only works with Dry::Monads::Result adapter:

class CreateUser
  include Kwork[adapter: :result]
  include Deps["user_repo", "validate_user"]
  include Dry::Monads[:result]
  
  DEFAULT_USER_ATTRS = {
    country: :us,
    currency: :usd
  }

  def call(user_attrs)
    user = pipe user_attrs,
      merge(DEFAULT_USER_ATTRS),
      method(:validate_user)

    step create_user(user)
  end

  private

  def create_user(user)
    Success(user_repo.create(user))
  end
end

Extensions

More often than not, a business transaction needs to be wrapped within a database transaction. To support this use case, Kwork gives you the ability to extend the transaction callback so you can wrap it with your own code. A couple of extensions are shipped by default, but you can easily build your own.

ROM

You need to add rom to your Gemfile to use it. When this extension is used, the Kwork transaction is wrapped within a database transaction, which is rolled back in the case of returning a failure.

require "kwork"
require "kwork/extensions/rom"

rom = # ROM container

class AddUser
  include Kwork[
    extension: Kwork::Extensions::ROM[rom, :default] # :default is the name of the gateway
  ]
  # ...
end

ActiveRecord

On a Rails application, you can use the ActiveRecord extension. The raw Kwork transaction will be wrapped within a database transaction, and it'll be rolled back in case of returning a failure.

require "kwork"
require "kwork/extensions/active_record"

class AddUser
  include Kwork[
    extension: Kwork::Extensions::ActiveRecord
  ]
  # ...
end

Custom extensions

Custom extensions are just anything responding to #call accepting the Kwork transaction callback. You only need to ensure that you respond the result of executing that callback. Take into account that the callback will return an instance of Kwork::Result, regardless of the adapter in use. That ensures fully operability with any result type.

require "kwork"

MyExtension = lambda do |callback|
 callback.().tap do |result|
   do_something if result.success?
 end
end

class AddUser
  include Kwork[
    extension: MyExtension
  ]
  # ...
end

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/kwork. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Kwork project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.