ActiveAdmin template

admin.rb

# lib/templates/active_admin/resource/admin.rb
ActiveAdmin.register <%= class_name %> do
  <% attributes = Kernel.const_get(class_name).attribute_names %>
  <% columns = Kernel.const_get(class_name).columns %>
  <% content_columns = Kernel.const_get(class_name).content_columns %>
  # <%= class_name %> attributes are:
  # <%= attributes.join(" ") %>

  # The Index Page
  index do |i|
    selectable_column
<% if attributes.include?("id") -%>
    id_column
<% end -%>
<% content_columns.each do |attr| -%>
<% if attr.type == :datetime -%>
    column "<%= attr.name.humanize.sub(" ","&nbsp;") -%>".html_safe, :sortable => :<%= attr.name -%> do |r|
      I18n.l r.<%= attr.name -%>,  :format => :long
    end
<% elsif attr.type == :boolean -%>
    column "<%= attr.name.humanize -%>", :sortable => :<%= attr.name -%> do |<%= class_name.downcase -%>|
      status_tag <%= class_name.downcase -%>.<%= attr.name -%> ? 'On' : 'Off'
    end
<% elsif attr.name == "id" -%>
<% else -%>
    column :<%= attr.name -%> # <%= attr.type %>
<% end -%>
<% end -%>
    default_actions
  end


  # Filters on index Page
<%
  resource_class = Kernel.const_get(class_name)
  reflections = if resource_class.respond_to?(:reflections)
                  resource_class.reflections.collect{|name, r| name }
                else
                  []
                end
  contentcols = if resource_class.respond_to?(:content_columns)
                  resource_class.content_columns.collect{|c|  c.name }
                else
                  []
                end
  default_filters = reflections + contentcols

-%>
<% default_filters.each do |attr| -%>
  <%= "filter :#{attr}" %>
<% end -%>

  # The Show Page
  show do |<%= class_name.downcase %>|
    attributes_table do
      <% attributes.each do |attr| %><%= "      row  :#{attr}\n" %><% end %>
    end
    active_admin_comments
  end

  # The form
  form do |f|
    f.inputs do
<% attributes.each do |attribute| %>      f.input :<%= attribute %>, :label => <%= "'#{attribute.humanize}'\n" %><% end %>
    end
    f.buttons
  end


  # Extra controller methods and customizations
  controller do
    defaults :finder => :find_by_url
    def role_given?
      true
    end
    def as_role
      user.is_admin? ? {:as => :admin} : {}
    end
  end

end