Rails: Simple survey with json/xml output

I want to create a simple app with a webform interface for adding questions and answers. Something like voting. In one form I want to have a textfield for a question and several addable/removable fields for answers.

Is there some gem for that? I have 开发者_C百科found Surveyor but it is too complex for my needs.

You could work through the "Nested Model Form" tutorials on railscasts.com, then you would have, at least, the backend to create your surveys.