rails dynamically generate a form -

i'm pretty new whole rails mvc concept, , i've been tasked creating form following:

• takes test number
• shows how many sections there per test (this constant, 4)
• allows region user enter in responses each question in section. number of questions in each section changes depending on test number get.

i have view looks this:

  = form_for [@answer_sheet] |f|       =f.collection_select(:test_prep_number, exam.find(:all),:test_prep_number, :test_prep_number, {:include_blank => 'select test prep number'})       =f.fields_for :answer_sections |section_form|          =section_form.label :section               .form-inline              =f.label :a               =radio_button_tag 'answer', 'a'              =f.label :b              =radio_button_tag 'answer', 'b'              =f.label :c              =radio_button_tag 'answer', 'c'              =f.label :d              =radio_button_tag 'answer', 'd'              =f.label :e              =radio_button_tag 'answer', 'e' 

my controller looks this:

def index     @answer_sheet = answersheet.build_with_answer_sections     @answer_section = answersection.new     @section_count = answersection.where("exam_id = ?", params[:test_prep_number).count end 

the issue i'm having right can't seem wrap head around creating correct number of radio buttons. far, i've managed generate 1 question per section.

i'm assuming i'll need loop (which require query find how many questions per exam section).

edit: adding models requested

answer sheet model

class answersheet < activerecord::base   attr_accessible :date, :raw_score, :test_prep_number, :answer_sections, answer_sections_attributes max = 101 validates :test_prep_number, :presence => true validates :raw_score, :presence => true, :numericality => { :greater_than_or_equal_to => 0, :less_than_or_equal_to => max} validates :date, :timeliness => {:on_or_before => lambda { date.current }, :type => :date}, :presence => true belongs_to :user has_many :answer_sections 

answer section model

class answersection < activerecord::base   max = 30    attr_accessible :section_score, :answers, :answer_attributes   has_many :answers, :dependent => :destroy   belongs_to :answer_sheet   accepts_nested_attributes_for :answers    validates :section_score, :presence => true, :numericality => { :greater_than_or_equal_to => 0, :less_than_or_equal_to => max } 

i recommend tweaking models breaks choice users answer:

class test < activerecord::base   belongs_to :user   has_many :question    attr_accessible :date, :test_prep_number    validates :test_prep_number, :presence => true   validates :date, :timeliness => {:on_or_before => lambda { date.current }, :type => :date}, :presence => true end  class question < activerecord::base   max = 30    attr_accessible :question_text   has_many :choices, :dependent => :destroy   has_one :answer   belongs_to :test   accepts_nested_attributes_for :answers  end  class choice < activerecord::base   attr_accessible :question_id, :choice_text, :correct_choice   belongs_to :question end  class answer < activerecord::base   attr_accessible :choice_id   belongs_to :user   belongs_to :question  end