Lite::Decorator

Lite::Decorator is a library for using the decorator pattern to separate view/presentation
logic from classes.

Installation

Add this line to your application’s Gemfile:

gem 'lite-decorator'

And then execute:

$ bundle

Or install it yourself as:

$ gem install lite-decorator

Table of Contents

• Setup
• Usage
• Generator

Setup

Defining a decorator is as simple as inheriting the base class and adding your logic.

class UserDecorator < Lite::Decorator::Base
  def full_name
    first_name + ' ' + last_name
  end
end

Usage

To access the decorator you need to pass the object to the decorator class.
PORO’s and ActiveRecord objects can be decorated with this method.

Instance

user = User.first
decorator = UserDecorator.new(user)
decorator.full_name #=> "John Doe"

Collection

users = User.all
collection = UserDecorator.new(users)
collection.map(&:full_name) #=> ["John Doe", "Jane Poe"]

Infered decoration

Including the Inference module will setup a decorator_class and decorator method
that you can access via your PORO and ActiveRecord objects.

class User
  include Lite::Decorator::Inference
end
user = User.first
user.decorator.full_name

Decorator delegation

Including the Delegator module will use method missing to delegate decorator methods as
if it lived on the PORO or ActiveRecord object itself. If neither the class instance and the
decorator contain the method, a NoMethodError just like normal.

class User < ActiveRecord::Base
  include Lite::Decorator::Delegator
end
user = User.first
user.full_name

Generator

Use rails g decorator NAME will generate the following files:

app/decorators/[NAME]_decorator.rb

If an ApplicationDecorator file in the app/decorators directory is available, the
generator will create file that inherit from ApplicationDecorator if not it will
fallback to Lite::Base.

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 tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/drexed/lite-decorator. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant 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 Lite::Decorator project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.