gregbell/active_admin — pull request #2844 by AndreyChernyh (2014-01-05 18:15:42+00:00)
Title: Add ability to order by hstore columns in PostgreSQL

Example:

```ruby
class Device < ActiveRecord::Base
store_accessor :information, :model
end
```

```ruby
ActiveAdmin.register Device do
index do
column :model, sortable: "information->'model'"
end
end
```