「The name 'Todo' is either already used in your application or reserved by Ruby on Rails. Please choose an alternative and run this generator again.」エラー対処法

$ rails g model Todo item:text
Running via Spring preloader in process 83975
      invoke  active_record
The name 'Todo' is either already used in your application or reserved by Ruby on Rails. Please choose an alternative and run this generator again.

参考ページ
https://qiita.com/tu-kun/items/4fede82431e546abd941

原因：今回作ろうとしてるRailsアプリケーションのモジュール名とモデル名が重複していたためエラーになった

1.モジュール名の変更 Todo → RailsTodo

config/application.rb

require_relative 'boot'

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

- module Todo
+ module RailsTodo
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 6.0

    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration can go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded after loading
    # the framework and any gems in your application.
  end
end

2.モジュール名を変更したあと、フォルダ名を変更する　todo →　rails_todo

• フォルダ名はスネークケース（小文字で単語区切りが_）
• モジュール名はアッパーキャメルケース（単語区切りが大文字でそれ以外は小文字）
• Railsにおいてアプリケーション名を表す部分はconfig/application.rbのモジュール名のことをいう

参考ページ
https://designsupply-web.com/developmentlab/4052/

エラー解消

$ rails g model Todo item:text completed:boolean
Running via Spring preloader in process 84393
      invoke  active_record
      create    db/migrate/20200216151440_create_todos.rb
      create    app/models/todo.rb
      invoke    test_unit
      create      test/models/todo_test.rb
      create      test/fixtures/todos.yml
$ rails db:migrate
== 20200216151440 CreateTodos: migrating ======================================
-- create_table(:todos)
   -> 0.0018s
== 20200216151440 CreateTodos: migrated (0.0018s) =============================