Checkboxes for rendering an Hash in Rails

hash_checkboxes_rails.rb

# file mood.rb

Mood = Struc.new(:happy)


# file user.rb

class User
  serialize mood, Mood
  def mood=(attr={})
    new_mood= Mood.new
    new_mood.members.each do |k|
      new_mood.send(:"#{k}=", attr.fetch(k, nil))
    end
    super(new_mood)
  end
end



# file users/edit.html.erb

<%= form_for user do |f| %>
    <%= f.fields_for :mood, user.mood do |b| %>
        <%= b.check_box :happy %>
    <% end  %>
    <%= f.submit %>
<% end %>