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Contents
---
redirect_from: /docs/11-decorators.html
---
# Decorators
Active Admin allows you to use the decorator pattern to provide view-specific
versions of a resource. [Draper](https://github.com/drapergem/draper) is
recommended but not required.
## Example usage
```ruby
# app/models/post.rb
class Post < ActiveRecord::Base
# has title, content, and image_url
end
# app/decorators/post_decorator.rb
class PostDecorator < Draper::Decorator
delegate_all
def image
h.image_tag model.image_url
end
end
# app/admin/post.rb
ActiveAdmin.register Post do
decorate_with PostDecorator
index do
column :title
column :image
actions
end
end
```
You can pass any decorator class as an argument to `decorate_with`
as long as it accepts the record to be decorated as a parameter in
the initializer, and responds to all the necessary methods.
```ruby
# app/decorators/post_decorator.rb
class PostDecorator
attr_reader :post
delegate_missing_to :post
def initialize(post)
@post = post
end
end
```
## Forms
By default, ActiveAdmin does *not* decorate the resource used to render forms.
If you need ActiveAdmin to decorate the forms, you can pass `decorate: true` to the
form block.
```ruby
ActiveAdmin.register Post do
decorate_with PostDecorator
form decorate: true do |f|
# ...
end
end
```
Version data entries
13 entries across 13 versions & 2 rubygems