In a Rails form, using one submit button to send data for multiple models

Question

I am creating a survey with the following data model:MathTest has_many math_questions

On MathTest#update I want to create one form for every question. The form should look something like this:

<%= form_for(mathtest) do %>
  <% math_question.each do |question| %>
    <%= f.label :answer %>
    <%= f.text_field :answer %>
    <%= f.hidden_field math_question.id %>
  <% end %>

  <% f.submit %>
<% end %>

I want to send the MathTest Controller a set of tuples with a math_question id and the answer for that question. Then in the Controller, I can call another method that evaluates each question's answer.

How do I write my form to send the appropriate tuple?

Eric Baldwin · Accepted Answer · 2013-11-15 05:23:39Z

1

This should do it:

<%= form_for(mathtest) do |f| %>
  <% math_question.each do |question| %>
    <%= f.fields_for :answer do |ff| %>
      <%= ff.label :answer %>
      <%= ff.text_field :answer %>
    <% end %>
  <% end %>

  <% f.submit %>
<% end %>

Also edit the model:

class MathTest < ActiveRecord::Base
  has_many :math_questions
  accepts_nested_attributes_for :math_questions

fields_for documentation: http://apidock.com/rails/ActionView/Helpers/FormHelper/fields_for

edited Nov 15, 2013 at 5:23

Eric Baldwin

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answered Nov 12, 2013 at 22:05

MrYoshiji

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3 Comments

Philip7899 Over a year ago

You also need to put 'accepts_nested_attributes_for :math_questions' in your math test model

Philip7899 Over a year ago

I would also consider adding the cocoon gem.

Eric Baldwin Over a year ago

I'm getting an error here: undefined method model_name' for Fixnum:Class` Where it refers to the following line: <% f.fields_for question.answer do |ff| %>. Not sure why, but check this pastie for the slightly modified version of your answer I tried: pastie.org/private/padhgvgrllayh20nedpxq

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