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.

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