Genericizing Rails views

_form.html.haml

= semantic_form_for entry do |f|
  = f.inputs
  = f.buttons

base.json.rabl

attributes(:id, :name, :email, :phone, :picture)

index.html.haml

%h1= t('.title')
%p= link_to t(".new_#{entry_class.name.underscore}"), polymorphic_path(entry_class, :action => :new)

%table
  %thead
    %tr
      %th ID
      -# This is horrible, but there doesn't seem to be any other way to get
        model attributes without creating an actual object instance.
      - for header in entry_class.new.attribute_names
        %th= entry_class.human_attribute_name header
      %th{:colspan => 3}= t 'actions'

  %tbody
    - for entry in @entries
      %tr{ :class => cycle(:odd, :even) }
        %td= entry.id
        - for key, val in entry.attributes.except('id')
          %td= val
        %td.action= link_to t('show'), entry
        %td.action= link_to t('edit'), polymorphic_path(entry, :action => :edit)
        %td.action= link_to t('destroy'), entry, :confirm => t('are_you_sure'), :method => :delete

index.json.rabl

collection @entries
extends "#{entry_views_folder_path}/base"

users_controller.rb

def entry_class
  User
end