Rails 投稿機能実装したいが、投稿を行うとエラー画面になってしまう

Question

実現したいこと

Rails　投稿機能実装したいが、投稿を行うとエラー画面になってしまう

前提

Railsで投稿機能実装しようとしていますが、投稿を行うとエラー画面になってしまいます。
初学者であり、質問的を得ていないかもしれませんが、何卒よろしくお願いいたします。

発生している問題・エラーメッセージ

ActiveModel::UnknownAttributeError in PostsController#create
unknown attribute 'post_user_id' for Post.

Extracted source (around line #28):              
# POST /posts
  def create
    @post = current_user.posts.build(post_params)
    if @post.save
      redirect_to @post, notice: 'Post was successfully created.'
    else

該当のソースコード

class PostsController < ApplicationController
  before_action :set_post, only: %i[show edit update destroy]

  # GET /posts
  def index
    @posts = Post.all
  end

  # GET /posts/1
  def show
    @post = Post.find_by(params[:id])
  end

  # GET /posts/new
  def new
    @post = Post.new
  end

  # GET /posts/1/edit
  def edit
    if @post.user_id != @current_user.id
      @post = Post.find(params[:id])
    end
  end

# POST /posts
  def create
    @post = current_user.posts.build(post_params)
    if @post.save
      redirect_to @post, notice: 'Post was successfully created.'
    else
      render :new
    end
  end

  # PATCH/PUT /posts/1
  def update
    @post = Post.find(params[:id])
    if @post.update(post_params)
      redirect_to @post, notice: 'Post was successfully updated.'
    else
      render :edit
    end
  end

  # DELETE /posts/1
  def destroy
    @post = Post.find(params[:id])
    if @post.user_id != @current_user.id
      @post = Post.find(params[:id])
      @post.destroy
      redirect_to @post, notice: 'Post was successfully destroyed.'
    end
  end

  private

  # Use callbacks to share common setup or constraints between actions.
  def set_post
    @post = Post.find(params[:id])
  end
  
  # Only allow a trusted parameter "white list" through.
  def post_params
    params.require(:post).permit(:title, :content)
  end
end

class Post < ApplicationRecord
    validates :title, presence: true, length: { maximum: 30 }
    validates :content, presence: true, length: { maximum: 100}
  
    belongs_to :user
    def user
      return User.find_by(id: self.user_id)
    end
  end

class User < ApplicationRecord
  authenticates_with_sorcery!

  validates :password, length: { minimum: 3 }, if: -> { new_record? || changes[:crypted_password] }
  validates :password, confirmation: true, if: -> { new_record? || changes[:crypted_password] }
  validates :password_confirmation, presence: true, if: -> { new_record? || changes[:crypted_password] }

  validates :email, uniqueness: true
  validates :email, presence: true
  validates :first_name, presence: true, length: { maximum: 255 }
  validates :last_name, presence: true, length: { maximum: 255 }

  has_many :posts, dependent: :destroy, foreign_key: :post_user_id
end

# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.

ActiveRecord::Schema.define(version: 2023_05_07_041659) do

  create_table "posts", force: :cascade do |t|
    t.string "title"
    t.text "content"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "users", force: :cascade do |t|
    t.string "email", null: false
    t.string "crypted_password"
    t.string "salt"
    t.string "first_name", null: false
    t.string "last_name", null: false
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["email"], name: "index_users_on_email", unique: true
  end

end

試したこと

下記内容が原因ではないかとコードの一部修正を行ってみましたが、エラーは解消されませんでした。
・current_userがnilである場合に備えて、デフォルト値を設定する
・current_userがnilである場合には、ログイン画面にリダイレクトする
・editアクションとdestroyアクションの中で、@current_userをcurrent_userに修正する

class PostsController < ApplicationController
  before_action :set_post, only: %i[show edit update destroy]
  before_action :authenticate_user!, only: %i[new create edit update destroy]

  # GET /posts
  def index
    @posts = Post.all
  end

  # GET /posts/1
  def show
  end

  # GET /posts/new
  def new
    @post = current_user.posts.build
  end

  # GET /posts/1/edit
  def edit
    if @post.user_id != current_user.id
      redirect_to @post, alert: "You don't have permission to edit this post."
    end
  end

  # POST /posts
  def create
    @post = current_user.posts.build(post_params)
    if @post.save
      redirect_to @post, notice: 'Post was successfully created.'
    else
      render :new
    end
  end

  # PATCH/PUT /posts/1
  def update
    if @post.update(post_params)
      redirect_to @post, notice: 'Post was successfully updated.'
    else
      render :edit
    end
  end

  # DELETE /posts/1
  def destroy
    if @post.user_id != current_user.id
      redirect_to @post, alert: "You don't have permission to delete this post."
    else
      @post.destroy
      redirect_to posts_url, notice: 'Post was successfully destroyed.'
    end
  end

  private

  # Use callbacks to share common setup or constraints between actions.
  def set_post
    @post = Post.find(params[:id])
  end

  # Only allow a list of trusted parameters through.
  def post_params
    params.require(:post).permit(:title, :content)
  end
end

補足情報（FW/ツールのバージョンなど）

エラー発生時のログは下記の通りです。

Started POST "/posts" for ::1 at 2023-05-11 09:47:22 +0900
Processing by PostsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"F83JrNxipFNThAHJnUkTg9HOLjd1X4txR3FnJ3rCtAw23lRQp6gzEhib9mjv6zG6Lg0RItBWDS4yetJee79phA", "post"=>{"title"=>"test", "content"=>"test"}, "commit"=>"Create Post"}
  User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT ?  [["id", 1], ["LIMIT", 1]]
  ↳ app/controllers/posts_controller.rb:28
Completed 500 Internal Server Error in 3ms (ActiveRecord: 0.2ms)

ActiveModel::UnknownAttributeError (unknown attribute 'post_user_id' for Post.):  
app/controllers/posts_controller.rb:28:in `create'

Comments

[winterboum]

model の定義がおかしそう。
post.rb, user.rb と schema 載せて下さい。

[yoshi32]

ご返答ありがとうございます。
下記それぞれ記載いたします。(見辛くすみません)

<post.rb>
class Post < ApplicationRecord
validates :title, presence: true, length: { maximum: 30 }
validates :content, presence: true, length: { maximum: 100}

belongs_to :user
def user
return User.find_by(id: self.user_id)
end
end

<user.rb>
class User < ApplicationRecord
authenticates_with_sorcery!

validates :password, length: { minimum: 3 }, if: -> { new_record? || changes[:crypted_password] }
validates :password, confirmation: true, if: -> { new_record? || changes[:crypted_password] }
validates :password_confirmation, presence: true, if: -> { new_record? || changes[:crypted_password] }

validates :email, uniqueness: true
validates :email, presence: true
validates :first_name, presence: true, length: { maximum: 255 }
validates :last_name, presence: true, length: { maximum: 255 }

has_many :posts, dependent: :destroy, foreign_key: :post_user_id
end

<schema>
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.

ActiveRecord::Schema.define(version: 2023_05_07_041659) do

create_table "posts", force: :cascade do |t|
t.string "title"
t.text "content"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end

create_table "users", force: :cascade do |t|
t.string "email", null: false
t.string "crypted_password"
t.string "salt"
t.string "first_name", null: false
t.string "last_name", null: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["email"], name: "index_users_on_email", unique: true
end

end

[winterboum]

code は質問欄を編集してそちらに書いてください。
インデントがないので読みづらい

[yoshi32]

失礼いたしました。
ご指摘ありがとうございます、質問欄に追記いたしました。

Answer 1

user.rb の has_many :posts, dependent: :destroy, foreign_key: :post_user_id の行に問題がありますね。
というヒントでとりあえずトライしてみてください。

Comments

[yoshi32]

ヒントありがとうございます！一旦トライしてみます！

[yoshi32]

post.rbでユーザ定義されているため、
foreign_key: :post_user_id
部分不要かと思い削除してみましたが、エラー変わらずでした。
引き続きtryしてみますが、一旦状況共有まで！

[winterboum]

「エラー変わらず」という表現は要注意。
相変わらずエラーがでるのは変わらず なのか
全く同じエラーがでる のか
この表現だと後者と取られかねない。

全く同じですか？ エラー がでた という現象は同じ でも、メッセージは変わってません？

[yoshi32]

あ、仰る通りです、失礼しました！(勉強になります)

エラーですが、
unknown attribute 'post_user_id' for Post.
が
unknown attribute 'user_id' for Post.
に変わっていました！(他は一緒)

[winterboum]

でしょうね。
そこが次のヒントです。

[yoshi32]

ありがとうございます！
belongs_to :userを記載し、db migrateしたら投稿できるようになりました！
引き続きdeleteとupdateがうまく反応していないので探索しますが、一旦投稿の方は解決できました！
ありがとうございます！