title: Rails create without redirect or refresh
body: <p>I've got a javascript script on a view that submits data to a rails controller via a post method :</p>
  
  <pre><code>$.post("/user_answers?user_answer[question_id]=" + gon.questions[questionNum]["id"] + "&amp;correct=true")
  </code></pre>
  
  <p>and basically the controller takes this post and updates or creates a new user_answer. </p>
  
  <pre><code>def create
    @user_answer = current_user.user_answers.find_or_initialize_by(answer_params)    
    # Handles box assignment based on correct or wrong answer
    if params[:correct] == "true"
      @user_answer.box = 1
    elsif params[:correct] == "false"
      @user_answer.box = 2
    end
    @user_answer.save
  end
  </code></pre>
  
  <p>This works perfectly, except I noticed that the controller tries to redirect to user_answers/create and returns an error because that doesn't exist. This doesn't affect the user's experience at all, but it does make an extra request to the server for no reason. </p>
  
  <p>The thing is, I don't want to redirect to anything or refresh to anything, because the post just needs to update the record. The view updates itself using Javascript. How do I remove the default redirect_to action in .save or .create?</p>