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我见过其他类似的问题（比如这个），但是略有不同。

我使用命令创建了一个全新的 Rails API 应用程序rails new backend -d=postgresql -T --api。我已经设置好数据库并且连接正常。现在我正在尝试安装graphql gem。它在我的 Gemfile 中，我已经运行bundle install，下一步是bundle exec rails generate graphql:install根据文档运行命令。但是，当我运行它时，我收到此错误：

/Users/jimmiejackson/.rvm/gems/ruby-2.5.5/gems/bundler-2.2.11/lib/bundler/rubygems_integration.rb:334:in `block (2 levels) in replace_gem': Error loading the 'sqlite3' Active Record adapter. Missing a gem it depends on? sqlite3 is not part of the bundle. Add it to your Gemfile. (LoadError)
    from /Users/jimmiejackson/.rvm/gems/ruby-2.5.5/gems/activerecord-6.0.3.5/lib/active_record/connection_adapters/sqlite3_adapter.rb:13:in `<top (required)>'
    from ...
    from ...

我在 Github 问题、Google 或 Stack 中找不到任何答案。我不确定为什么当我从 new 安装 postgresql 时会出现 sqlite 错误。自从我上次开发 Rails 应用程序以来已经有一段时间了，可能是什么问题？

宝石文件：

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

ruby '2.5.5'

gem 'rails', '~> 6.0.3', '>= 6.0.3.5'
gem 'pg', '>= 0.18', '< 2.0'
gem 'puma', '~> 4.1'
gem 'bcrypt', '~> 3.1.7'
gem 'graphql', '1.9.17'

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

# Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin AJAX possible
gem 'rack-cors'

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
  gem 'listen', '~> 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'
  gem 'graphiql-rails', '1.7.0'
end

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

数据库.yml：

default: &default
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>

development:
  <<: *default
  database: movie_show_tracker_development

test:
  <<: *default
  database: movie_show_tracker_test
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1 回答 1

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好吧，我终于解决了。我最终不得不再次从头开始项目，并使用 Ruby v.2.6.3/Rails v.6.0.3.5 来让 graphql gem 正常工作。甚至不确定这些是否是罪魁祸首，但它现在似乎正在起作用！

于 2021-02-25T23:22:05.460 回答