User information isn't storing to proper user - ruby-on-rails

Question

In my Users controller, I have the following method
def show
#user = User.find(params[:id])
if current_user.id == params[:id] # im not sure if this is right
#answer = Answer.new
else
#answer = Answer.find(params[:id])
end
end
where
class User
has_many :answers
end
and
class Answer
belongs_to :user
end
When I open another user (A) by the signed in user (B), I want A's quiz questions (which also belongs_to User through a has_one association) to have the answers by B.
As is, if B answers A's questions, and then I log in with A, they will have the same answers of the original B to A.
If it helps, in my Answers controller I have the following methods.
def create
#answer = current_user.answers.build(answer_params)
if #answer.save
flash[:success] = "Updated"
redirect_to '/'
else
render 'new'
end
end
def update
respond_to do |format|
#answer = Answer.find(params[:id])
if #answer.update(answer_params)
format.html { redirect_to '/', notice: 'Answers were successfully updated.' }
format.json { render :show, status: :ok, location: #answer }
else
format.html { render :edit }
format.json { render json: #answer.errors, status: :unprocessable_entity }
end
end
end
def answer_params
params.require(:answer).permit(:r1, :r2, :r3, :r4, :r5)
end
and I also have the migration
class AddUserIdToAnswers < ActiveRecord::Migration
def change
add_column :answers, :user_id, :integer
end
end
EDIT:
Quizzes Controller (belongs_to User, User has_one :quiz)
class QuizzesController < ApplicationController
def edit
#quiz = Quiz.find(params:[id])
end
def create
#quiz = current_user.build_quiz(quiz_params)
if #quiz.save
flash[:success] = "Updated"
redirect_to '/'
else
render 'new'
end
end
def update
respond_to do |format|
#quiz = Quiz.find(params[:id])
if #quiz.update(quiz_params)
format.html { redirect_to '/', notice: 'Quiz was successfully updated.' }
format.json { render :show, status: :ok, location: #quiz }
else
format.html { render :edit }
format.json { render json: #quiz.errors, status: :unprocessable_entity }
end
end
end
def quiz_params
params.require(:quiz).permit(:q1, :q2, :q3, :q4, :q5)
end
def show
#quizzes = Quiz.all
end
end
and my Routes.rb
Rails.application.routes.draw do
mount RailsAdmin::Engine => '/admin', as: 'rails_admin'
devise_for :users
root to: 'welcome#landing'
resources :users, :quizzes, :answers
end

Answer 1

I am not gone through every aspect. But one issue in your show action.
if current_user.id == params[:id] # im not sure if this is right
With this you will not get new form. Because params[:id] type is string and current_user.id type is integer. So it will always return false.
Try change like :
if current_user.id == params[:id].to_i
Or compare user object directly
if current_user == #user

Answer 2

Try my suggestion helpisgood
def show
#user = User.find(params[:id])
if current_user == #user
#answer = Answer.new
else
#answer = Answer.find_by(user_id: #user.id)
end
end