画像投稿機能が反映されない

Question

前提・実現したいこと

ここに質問の内容を詳しく書いてください。
new.html.erbに画像投稿機能を反映させたいのですがエラーが出てしまいます。
<%= f.attachment_field :image %>

発生している問題・エラーメッセージ

```undefined local variable or method `f' for #<#Class:0x00007f9251736c58:0x00007f9251735268>
Extracted source (around line #6):
4<%= form_with(model: @tweet, local: true) do |form| %>
5 <h4>画像</h4>
6 <%= f.attachment_field :image %>ここがエラー
7 <%= form.text_area :text, placeholder: "本文", rows: "5" %>
8 <%= form.submit "送信" %>
9 <% end %>

エラーメッセージ
```undefined local variable or method `f' for #<#Class:0x00007f9251736c58:0x00007f9251735268>
<%= f.attachment_field :image %>
###ファイル
gemfile

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.6.5'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 6.0.0'
# Use mysql as the database for Active Record
gem 'mysql2', '0.5.3'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5'
# Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
gem 'webpacker', '~> 4.0'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.7'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use Active Model has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Active Storage variant
# gem 'image_processing', '~> 1.2'

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.4.2', require: false

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 2.15'
  gem 'selenium-webdriver'
  # Easy installation and use of web drivers to run system tests with browsers
  gem 'webdrivers'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

gem 'pry-rails'
gem 'devise'
gem "refile", require: "refile/rails", github: 'manfe/refile'
gem "refile-mini_magick"

scheme.rb

ActiveRecord::Schema.define(version: 2021_12_23_035607) do

  create_table "tweets", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
    t.string "name"
    t.string "text"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.string "image_id"
  end

  create_table "users", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
    t.string "email", default: "", null: false
    t.string "encrypted_password", default: "", null: false
    t.string "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.string "nickname"
    t.index ["email"], name: "index_users_on_email", unique: true
    t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
  end

end

tweet.rb

class Tweet < ApplicationRecord
   validates :text, presence: true
   attachment:image
end

tweets_controller.rb

class TweetsController < ApplicationController
   before_action :set_tweet, only: [:edit, :show]
   before_action :move_to_index, except: [:index, :show]
     def index
    @tweets = Tweet.all
  end
   def new
    @tweet = Tweet.new
  end
  def create
    Tweet.create(tweet_params)
  end
 def destroy
    tweet = Tweet.find(params[:id])
    tweet.destroy
  end
  def edit
  end
  def update
    tweet = Tweet.find(params[:id])
    tweet.update(tweet_params)
  end
  def show
  end
  private
  def tweet_params
    params.require(:tweet).permit(:name, :text,:image)
  end
  def set_tweet
    @tweet = Tweet.find(params[:id])
  end
  def move_to_index
    unless user_signed_in?
      redirect_to action: :index
    end
  end
end

new.html.erb

<div class="contents row">
  <div class="container">
    <h3>投稿する</h3>
    <%= form_with(model: @tweet, local: true) do |form| %>
        <h4>画像</h4>
  <%= f.attachment_field :image %>
      <%= form.text_area :text, placeholder: "本文", rows: "5" %>
      <%= form.submit "送信" %>
    <% end %>
  </div>
</div>

2021?????_add_image_id_to_tweets.rb

class AddImageIdToTweets < ActiveRecord::Migration[6.0]
  def change
   add_column :tweets, :image, :string
  end
end

Answer 1

もう一度試したらできました