Session[user_id]を利用できない

前提・実現したいこと

session[:user_id]を利用したい。

フロントサイドにReact.js、サーバーサイドにrails APIを利用してwebアプリ（アプリ名: Thinky）を開発しています。（deviseを使用していない。）

発生している問題・エラーメッセージ

ユーザーログイン（サインアップ）時にセットしたsession[:user_id]が利用できる時と利用できない時がある。

具体的には、サインアップ・ログイン・ログアウト・ログイン状態保持のメソッド(logged_in)では、では利用できる。

上記以外のメソッドでは利用できない。

該当のソースコード

application_controller.rb

ruby
1class ApplicationController < ActionController::API
2  include ActionController::Cookies
3  include CurrentUserConcern
4end

application.rb

ruby
1require_relative 'boot'
2
3require "rails"
4
5require "active_model/railtie"
6require "active_job/railtie"
7require "active_record/railtie"
8require "active_storage/engine"
9require "action_controller/railtie"
10require "action_mailer/railtie"
11require "action_view/railtie"
12require "action_cable/engine"
13require "rails/test_unit/railtie"
14
15
16Bundler.require(*Rails.groups)
17
18module Thinky
19  class Application < Rails::Application
20    config.load_defaults 5.2
21
22    config.middleware.use ActionDispatch::Cookies
23    config.middleware.use ActionDispatch::Session::CookieStore
24    
25    config.api_only = false
26    config.middleware.insert_before 0, Rack::Cors do
27      allow do
28        origins 'http://localhost:3000'
29        resource '*',
30        :headers => :any,
31        :methods => [:get, :post, :patch, :delete, :options],
32        credentials: true
33      end
34    end
35  end
36end

routes.rb

ruby
1Rails.application.routes.draw do
2  
3  get 'whies/index'
4
5  resources :sessions, only: [:create]
6  resources :registrations, only: [:create, :edit, :update]
7  delete :logout, to: "sessions#logout"
8  get :logged_in, to: "sessions#logged_in"
9
10  resources :whies do
11    member do
12      get 'count'
13      get 'user'
14      post   '/like/:why_id' => 'likes#like',   as: 'like'
15      delete '/like/:why_id' => 'likes#unlike', as: 'unlike'
16      get '/status/:why_id' => 'likes#status'
17      get 'search'
18      get 'like_whies'
19    end
20  end
21
22  post 'whies/post'
23  patch 'whies/update'
24
25  get 'answers/find_pv/:id' => 'answers#find_pv'
26  get 'answers/find_pb/:id' => 'answers#find_pb'
27  get 'answers/index_pv'
28  get 'answers/index_pb'
29  post 'answers/post_pv'
30  post 'answers/post_pb'
31end

current_user_concern.rb

ruby
1module CurrentUserConcern
2  extend ActiveSupport::Concern
3
4  included do
5    before_action :set_current_user
6  end
7
8  def set_current_user
9    if session[:user_id]
10      @current_user = User.find(session[:user_id])
11    end
12  end
13end
14

session[:user_id]を利用できる

registration_controller.rb

ruby
1class RegistrationsController < ApplicationController
2
3  def create
4    user = User.create!(
5      email: params['user']['email'],
6      password: params['user']['password'],
7      password_confirmation: params['user']['password_confirmation']
8    )
9
10    if user
11      session[:user_id] = user.id
12      render json: {
13        status: :created,
14        user: user,
15      }
16    else
17      render json: { status: 500 }
18    end
19  end
20
21  def edit
22    @user = User.find(params[:id])
23    render json: @user
24  end
25
26  def update
27    @user = User.find(params[:id])
28
29
30    if  params['user']['password']
31
32     user = @user.update(
33      email: params['user']['email'],
34      username: params['user']['username'],
35      password: params['user']['password'],
36    )
37    else
38    user = @user.update(
39      email: params['user']['email'],
40      username: params['user']['username'],
41    )
42    end
43
44    if user
45      render json: {
46        status: :created,
47        user: @user
48      }
49    else
50      render json: { status: 500 }
51    end
52  end
53end
54

sessions_controller.rb

ruby
1class SessionsController < ApplicationController
2  include CurrentUserConcern
3  
4  def create
5    user = User
6            .find_by(email: params["user"]["email"])
7            .try(:authenticate, params["user"]["password"])
8    if user
9      session[:user_id] = user.id
10      render json: {
11        status: :created,
12        logged_in: true,
13        user: user,
14      }
15    else
16      render json: { status: 401 }
17    end
18  end
19
20  def logged_in
21    if @current_user
22      render json: {
23        logged_in: true,
24        current_user: @current_user,
25        session: session
26      }
27    else
28      render json: {
29        logged_in: false
30      }
31    end
32  end
33
34  def logout
35    reset_session
36    render json: { status: 200, logged_out: true }
37  end
38end
39
40

session[:user_id]を利用できない（@current_userがNo Class）

whies_controller

ruby
1class WhiesController < ApplicationController
2  include CurrentUserConcern
3
4  def index
5    @whies = Why.where(share: true)
6
7    render json: @whies
8
9  end
10
11  def show
12    @why = Why.find(params[:id])
13    render json: @why
14  end
15
16  def post
17    @why = Why.create(question: params[:why], genre_id: params[:genre], share: params[:share], user_id: @current_user.id)
18    render json: @why
19  end
20  
21  （以下省略）

likes_controller.rb

ruby
1class LikesController < ApplicationController
2  include CurrentUserConcern
3  before_action :set_variables
4
5  
6  （省略）
7
8  def status
9    like = Like.find_by(why_id: @why.id, user_id: @user.id)
10    if like
11      render json: {status: "already liked"}
12    else
13      render json: {status: "not liked yet"}
14    end
15  end
16
17  private
18  def set_variables
19    @why = Why.find(params[:why_id])
20    @user = User.find(@current_user.id)
21  end
22end