rails/rails — pull request #9622 by alexeymuranov (2013-03-09 11:21:43+00:00)
Title: New Action View helpers: hidden field tags from a flat or nested hash

Add helper methods to convert flat or nested hashes into a sequence of hidden input fields to be submitted with the form. Example:

```ruby
hidden_field_tags_from_nested_hash({ :a => { :b => ['c', 'd']}, 'e' => 5 }, :id => nil)
```
Output:

```html

```