Decorators

Active Admin supports the use of decorators for resources. Resources will be
decorated for the index and show blocks. The
draper gem is recommended but not required
(more on requirements below). Note, that Active Admin works out of the box with
Draper >= 1.0.0.

Configuration

ActiveAdmin.register Post do
decorate_with PostDecorator
end

Example Usage

This example uses draper.

# Gemfile
gem ‘draper’, ‘>= 1.0.0’

Assuming a post and a post decorator

class Post < ActiveRecord::Base; end

class PostDecorator < ApplicationDecorator
decorates :post

def image
h.image_tag model.image_url
end
end

Then the following is possible

ActiveAdmin.register Post do
decorate_with PostDecorator

index do
column(:title)
column(:image)
end

show do
attributes_table do
row(:title)
row(:image)
end
end
end

Forms

Note that the resource proveded to form_for also gets decorated.

In most cases this will work as expected. However, it is possible to disable
automatic decoration in the form with the decorate option:

ActiveAdmin.register Post do
decorate_with PostDecorator

form decorate: false do
# …
end
end