param is missing or the value is empty: answer - ruby-on-rails

Question

I'm new to ruby on rails and I'm not understanding what exactly I'm doing wrong. I have a form for submitting a question for a multiple choice trivia game the question is supposed to be saved to a question database table and the 4 answers saved to an answer table with the question_id as a foreign key. However whenever I click the submit button with valid data entered for all fields, I keep getting the error, "param is missing or the value is empty: answer" from this block of code in my questions controller:
def answer_params
params.require(:answer).permit({:question_id => [#question.id]},:answer_text, :correct)
end
Here is the full class for my questions_controller.rb:
class QuestionsController < ApplicationController
def new
#question = Question.new
#answer1 = Answer.new
#answer2 = Answer.new
#answer3 = Answer.new
#answer4 = Answer.new
end
def create
#question = Question.new(question_params)
if #question.save
#answer1 = Answer.new(answer_params)
#answer2 = Answer.new(answer_params)
#answer3 = Answer.new(answer_params)
#answer4 = Answer.new(answer_params)
if #answer1.save && #answer2.save && #answer3.save && #answer4.save
redirect_to root_path
end
else
render 'new'
end
end
private
def question_params
params.require(:question).permit(:username, :question)
end
def answer_params
params.require(:answer).permit({:question_id => [#question.id]}, :answer_text, :correct)
end
end
answers_controller.rb:
class AnswersController < ApplicationController
def new
#answer = Answer.new(answer_params)
end
def create
#question = Question.find(params[:id])
#answer = Answer.new(answer_params)
if #answer.save
redirect_to root_path
end
end
private
def answer_params
params.require(:answer).permit({:question_id => [#question.id]}, :answer_text, :correct)
end
end
new.html.erb:
<%= form_for(#question) do |f| %>
<%= f.hidden_field :username, :value => current_user.email %>
<br>
<%= f.label :category %>
<%= f.text_field :category %>
<br>
<%= f.label :question %>
<%= f.text_field :question %>
<br>
<%= f.fields_for(#answer1) do |c| %>
<%= c.label :correct_answer %>
<%= c.text_field :answer_text %>
<%= c.hidden_field :correct, :value => true %>
<br>
<% end %>
<%= f.fields_for(#answer2) do |i| %>
<%= i.label :incorrect_answer1 %>
<%= i.text_field :answer_text %>
<%= i.hidden_field :correct, :value => false %>
<br>
<% end %>
<%= f.fields_for(#answer3) do |j| %>
<%= j.label :incorrect_answer2 %>
<%= j.text_field :answer_text %>
<%= j.hidden_field :correct, :value => false %>
<br>
<% end %>
<%= f.fields_for(#answer4) do |k| %>
<%= k.label :incorrect_answer3 %>
<%= k.text_field :answer_text %>
<%= k.hidden_field :correct, :value => false %>
<% end %>
<br>
<%= f.submit "Submit my question", class: "btn btn-primary"%>
<% end %>
question.rb:
class Question < ActiveRecord::Base
belongs_to :category
has_many :answers
end
answer.rb:
class Answer < ActiveRecord::Base
belongs_to :question
end
Can anyone tell me where I'm going wrong?