Usage

🚀 I create the dekorator gem if this interrest you.

Get started

Copy ApplicationDecorator inside app/decorators/application_decorator.rb and DecoratorsHelper inside decorators_helper.rb.

Then you could create and use your own decorators by create new class that extend from ApplicationDecorator.

Decorator

class PostDecorator < ApplicationDecorator
  include ActionView::Helpers::TextHelper

  decorates_association :comments
  # OR
  # decorates_association :comments, with: CommentDecorator

  def title
    title.upcase_first
  end

  def summary
    truncate(body, length: 170)
  end
end

class CommentDecorator < ApplicationDecorator
  def commented_at
    "commented at #{l(created_at)}"
  end
end

Views

To decorate a model, you have to use ApplicationDecorator#decorate. This method is accessible in your view with #decorate.

decorated_post = decorate(@post)
decorated_post = decorate(@post, with: PostDecorator)
decorate(@post) do |decorated_post|
  # use decorated_post here
end

<% @post = decorate(@post) %>
<h1><%= @post.title %></h1>

<p><%= @post.summary %></p>

<% @post.comments.each do |comment| %>
<p><b><%= comment.commented_at %></b></p>
<% end %>