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Decorating a Model using Draper

  • Draper automatically matches up models with their decorators by convention.
# app/decorators/user_decorator.rb
class UserDecorator < Draper::Decorator
  def full_name
    "#{object.first_name} #{object.last_name}"
  end

  def created_at
    Time.use_zone(h.current_user.timezone) do
      object.created_at.strftime("%A, %d %b %Y %l:%M %p")
    end
  end
end
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  • Given a user variable containing an ActiveRecord object, we can access our decorator by calling decorate on the user, or by specifying the Draper class if we want to be specific.
<% user = @user.decorate %><!-- OR -->
<% user = UserDecorator.decorate(@user) %>
<h1><%= user.full_name %></h1>
<h3>joined: <%= user.created_at %></h3>
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