Question

我试图在我的表中创建一篇文章，当我在教程中关注什么，被告知编写命令时，rails生成迁移create_articles，我收到此错误消息。未安装组，开发，测试和生产中的宝石。

下面是我的gemfile 来源＆＃39; https://rubygems.org＆＃39;

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.5.1'
# Use sqlite3 as the database for Active Record

# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do

  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end

group  :production do
gem    'pg'
gem    'rails_12factor'
end

Answer 1

要安装Gemfile中列出的gem，您需要在项目文件夹中运行以下命令：

bundle install

那么，之后你可以运行rails生成器：

rails g [model/controller/migration...]

Answer 2

请记住，开发，测试和生产小组将在这些组中列出与其环境相对应的宝石。

意思是，如果gem仅在开发中列出，则该gem不会安装在测试或生产中。

Answer 3

由于您曾经在没有开发和测试环境的情况下安装了gems，因此您必须通过强制包含测试和开发来删除设置，例如：

$ bundle install --with development test

这将清除“无”设置。

未安装组组，开发，测试和生产中的宝石

3 个答案: