allowing user to create answers to multiple questions in one form - ruby-on-rails

Question

I have a model relationship set up like this:
# User model
class User < ActiveRecord::Base
belongs_to :company
has_many :answers
# groups
has_many :group_memberships
has_many :group_questions, through: :groups, source: :questions
has_many :groups, through: :group_memberships
# question
has_many :question_participants, as: :questionable
has_many :questions, through: :question_participants
# questions created by admin
class Question < ActiveRecord::Base
belongs_to :company
has_many :question_participants
has_many :answers
has_many :users, through: :question_participants,
source: :questionable, source_type: 'User'
has_many :groups, through: :question_participants,
source: :questionable, source_type: 'Group'
has_many :companies, through: :question_participants,
source: :questionable, source_type: 'Company'
end
# user answers to questions
class Answer < ActiveRecord::Base
belongs_to :user
belongs_to :question
end
now my answer stores user_id, reply (their answer) and question id.
What I'd like to be able to create now is a form that allows a user to answer all the questions asked to them, and submit the answers.
I've setup my form like this on the view file (answers#new):
<%= form_for #answer do |f| %>
<% current_user.all_questions.each do |question| %>
<%= f.hidden_field :question_id, value: question.id %>
<p><%= question.name %>
<%= f.text_field :reply %>
<% end %>
<% end %>
which doesn't work, and I get why - issue is i don't know how to make it work with multiple save.

Answer 1

I hope I got your problem. Here is what I suggest:
<%= form_for #answer do |f| %>
<% current_user.all_questions.each do |question| %>
<%= hidden_field_tag 'questions[][id]', question.id %>
<p><%= question.name %>
<%= text_field_tag 'questions[][reply]' %>
<% end %>
<% end %>
Now in the controller action you can access params[:questions] and you'd get smth like this: [{"id"=>"1", "reply"=>"some text 1"}, {"id"=>"2", "reply"=>"some text 2"}]:
# your_controller.rb
def create_answers
answers = params[:questions].map do |question|
current_user.answers.create(question_id: question[:id], reply: question[:reply])
end
if answers.any(&:invalid?)
flash[:error] = 'Some answers were not accepted'
redirect_to :back
else
redirect_to home_path
end
end