Tuxedo Decorate

Tuxedo Decorate provides an easy to use Presenter layer on top of Rails views. It does not make any assumptions about your underline object or uses black magic voodoo code to determine your ActiveRecord Relations.

Installation

Currently rails 4.0 or higher and ruby version of 2.0.0 or higher are supported. Add this line to your application's Gemfile:

gem 'tuxedo_decorate', require: 'tuxedo'

Notice the require statement!

And then execute:

$ bundle

Or install it yourself as:

$ gem install tuxedo_decorate

Usage

To use Tuxedo simply include it in your presenter class. For example

class BananaPresenter
  include Tuxedo

  def name
    'hello'
  end

  def name_with_args(name, surname: '')
    "hello #{name}, #{surname}"
  end
end

In your views you can use the presenter_for helper to use the presenter. By default Tuxedo looks for a class with the same name but ending in Presenter. For example, we now use BananaPresenter.

<% presenter_for(Banana.new) do |present| %>
<span><%= present.name %></span>
<div><%= present.name_with_args('Jan', surname: 'Stevens') %></div>
end

Using the Present-and-Call [PRAC]

A shorthand is also included that allows to easily call a presenter method for to present object. For example

<%= prac(Banana.new, :name) %>

This basically translates to the following:

<%= presenter_for(Banana.new).name %>

Extra arguments are passed along to the presenter method, so the following also workes

<%= prac(Banana.new, :name_with_args, 'Jan', surname: 'Stevens') %>

Example Setup

We have a presenters folder in our app folder. In their we have an ApplicationPresenter that defines reusable methods. Every presenter inherits from ApplicationPresenter. For example

class ApplicationPresenter
  include Tuxedo

  # Here we setup our typical delegation methods
  delegate(:current_user,
    :link_to,
    :content_tag,
    to: :_h)

  # Bunch of shared methods
  def html_id
    # ...
  end
end

class BananaPresenter < ApplicationPresenter
  def name
    'hello'
  end

  def name_with_args(name, surname: '')
    "hello #{name}, #{surname}"
  end
end

FAQ

No blocks in the views because [reasons]!

Sure got you covered

<% present = presenter_for(Banana.new) %>
<span><%= present.name %></span>
<div><%= present.name_with_args('Jan', surname: 'Stevens') %></div>

But I rather have Presenters that are Decorater classes and are named [obscure name]

Allright you can configure the suffix to be used by using a config block and placing it somewhere in the Rails initialization chain

Tuxedo.configure do |config|
  config.suffix = 'ObscureName'
end

How can I access the original decorated object?

Easily, you can use object but thats quite obscure so by default Tuxedo "guesses" (demodulize + gsub + underscore) the name of your object. For example if my Presenter class is name BananaPresenter then I can access the original object by using banana

class BananaPresenter
  include Tuxedo

  def greetings
    "hello #{banana.name}"
  end
end

If thats not good enough you can overwrite the object_alias used. This allows for using monkey instead of banana.

class BananaPresenter
  include Tuxedo
  object_alias :monkey

  def greetings
    "hello #{monkey.name}"
  end
end

Can I use prac inside my Presenters?

Sure you can, for your convenience `prac`` is made available. This allows you to reuse presenter methods.

class BananaPresenter
  def name
    "BANANA BANANA BANANA"
  end
end

class MonkeyPresenter
  def eat
    prac monkey.banana, :name
  end
end

How can I access my view helpers / url helpers / rails helpers

We expose a method _h that delegates to the view context. So you have to prefix all your url helpers with _h, for example:

class BananaPresenter
  include Tuxedo

  def edit_link
    _h.edit_banana_path(banana)
  end
end

But I don't want to prefix everything with _h

I'ts ruby just use delegate, for example in our application we have to following setup

class BananaPresenter
  include Tuxedo
  delegate(:current_user,
    :link_to,
    :auth_link_to,
    :auth_service,
    to: :_h)

  def edit_link
    _h.edit_banana_path(banana)
  end
end

Development

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

1. Fork it
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 new Pull Request

License

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