_form.html.erb

# views/surveys/_form.html.erb
<%= form_for @survey do |f| %>
  <p>
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </p>
  <p><%= f.submit "Submit" %></p>
<% end %>

answer.rb

# == Schema Info
#
# Table name: answers
#
#  id               :integer
#  content          :text
#  created_at       :datetime
#  updated_at       :datetime
#
class Answer < ActiveRecord::Base
  belongs_to :question
end

question.rb

# == Schema Info
#
# Table name: surveys
#
#  id               :integer
#  content          :text
#  created_at       :datetime
#  updated_at       :datetime
#
class Question < ActiveRecord::Base
  belongs_to :survey
  has_many :answers, :dependent => :destroy
end

survey.rb

# == Schema Info
#
# Table name: surveys
#
#  id               :integer
#  name             :string
#  created_at       :datetime
#  updated_at       :datetime
#
class Survey < ActiveRecord::Base
  has_many :questions, :dependent => :destroy
end