Rails passing hidden form data via Controller - ruby-on-rails

Question

UPDATE: It seems like the error was probably due to a devise conflict. I used some content from another app which apparently made devise go nutty and not be able to read user sessions. I'll be starting with a clean install and seeing if I have better luck. Thanks!
I am creating a page which has a single question on it. On that page I have a form where people can answer that question. The form itself just has an answer block and a submit button. However, I want to tie it to both the user submitting the form and the question the answer is linked to. For security I want to do this in the controller, not the view. The answer form is being shown on the questions#index page. I am currently getting the following error:
undefined method `user' for #<AnswersController:0x007fe618e5cc10>
I suspect that if it made it past the user I would get the same for 'question'
The questions#index looks like this:
<div class="home_question">
<h1><%= #daily.question %></h1>
<div class="answer_form">
<%= form_for #answer do |answer| %>
<%= answer.label :answer, "What do you think?" %>
<%= answer.text_area :answer %>
<%= answer.button %>
<% end %>
</div>
</div>
The Questions Controller looks like this:
def index
#daily = Question.find_by(show_month: Time.now.month, show_day: Time.now.day)
#answer = Answer.new
end
The Answers Controller looks like this:
def index
#answers = Answer.all
#answer = Answer.new
end
def new
#answer = Answer.new
end
def create
#answer = Answer.new(answer_params)
#user = user(params[:id])
#question = question(params[:id])
if #answer.save
redirect_to root
else
render 'new'
end
end
private
def answer_params
params.require(:answer).permit(:answer, :users_id, :questions_id)
end
The data currently being passed by the form is:
{"utf8"=>"✓",
"authenticity_token"=>"mA16+dg7+Edzxvu/FVWR5r8PZ9zdNaOyvOwSz1VpOXU=",
"answer"=>{"answer"=>"test"},
"button"=>""}

Answer 1

The error that you're getting is because in the controller you're using the user variable which isn't defined. You want to use the uppercase model name User.
Getting the user id
If this is a logged in user then you can get their id by looking in the session. Usually Rails application will have a helper like this:
def current_user
#current_user ||= User.find(session[:user_id]) if session[:user_id]
end
You don't need this helper if you're using devise -- it's already done for you.
Getting the question id
First make sure that your associated resources are nested. So in our routes.rb file:
resources :questions do
resources :answers
end
This means that to create an answer we'll need to POST /questions/:id/answers.
The form changes to:
<%= form_for [#daily, #answer] do |answer| %>
<%= answer.label :answer, "What do you think?" %>
<%= answer.text_area :answer %>
<%= answer.button %>
<% end %>
and in the controller:
def create
#answer = Answer.new(answer_params)
#answer.user = current_user
#answer.question = Question.find(params[:id])
if #answer.save
redirect_to root
else
render 'new'
end
end