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Note: while we're actively using boring in production, it is still actively under development, and you should expect breaking changes.

Below is an example of usage for a classic Rails controller/view pattern.

# presenters/user_presenter.rb

class UserPresenter < Boring::Presenter
  # Declare the arguments needed to bind to presenter and their type
  arguments user: User

  # Declare pass-through methods
  delegate :birth_date, to: :user

  # Methods to be handled by the presenter
  def name
    "#{user.first_name} #{user.last_name}".strip
  end
end

# controllers/users_controller.rb

class UsersController < ApplicationController
  def index
    @users = User.all
    @user_presenter = UsersPresenter.new
  end
end

# views/users/index.html.erb

<ul>
  <% @users.each do |user| %>
    <% @user_presenter.bind(user: user) %>
    <li>
      <p>Full Name: <%= @user_presenter.name %></p>
      <p>Birthday: <%= @user_presenter.birth_date %></p>
    </li>
  <% end %>
</ul>

Some things worth noting that set boring apart from other presentation layers:

1. Explicit Delegation: only methods intended for presentation layer should be allowed in the presenter. boring will never pass super_dangerous_method! through to your bound object unless you want it to.
2. Type-Safe Bindings: the arguments method in the Boring::Presenter class lets you set up type checking for the arguments passed to the bind method. If you try to bind a Foo to your BarPresenter, we'll raise an exception.
3. Separate Objects: The presenter doesn't take over for your bound object; whether that bound object is available to your view is up to you, but you should never be unsure if you're dealing with a Foo or a FooPresenter.

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.

Bug reports and pull requests are welcome on GitHub at https://github.com/wkirby/boring.

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

boring was built by Apsis Labs. We love sharing what we build! Check out our other libraries on Github, and if you like our work you can hire us to build your vision.