了解 rails 命令选项参数

Question

如何更好地理解railscommand命令行help option喜欢，

rails new --help

它向我们展示了命令行选项的数量。

Usage:
  rails new APP_PATH [options]

Options:
  -r, [--ruby=PATH]                                      # Path to the Ruby binary of your choice
                                                         # Default: /home/vinay/.rvm/rubies/ruby-2.2.1/bin/ruby
  -m, [--template=TEMPLATE]                              # Path to some application template (can be a filesystem path or URL)
      [--skip-gemfile], [--no-skip-gemfile]              # Don't create a Gemfile
  -B, [--skip-bundle], [--no-skip-bundle]                # Don't run bundle install
  -G, [--skip-git], [--no-skip-git]                      # Skip .gitignore file
      [--skip-keeps], [--no-skip-keeps]                  # Skip source control .keep files
  -O, [--skip-active-record], [--no-skip-active-record]  # Skip Active Record files
  -S, [--skip-sprockets], [--no-skip-sprockets]          # Skip Sprockets files
      [--skip-spring], [--no-skip-spring]                # Don't install Spring application preloader
  -d, [--database=DATABASE]                              # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db/sqlserver/jdbcmysql/jdbcsqlite3/jdbcpostgresql/jdbc)
                                                         # Default: sqlite3
  -j, [--javascript=JAVASCRIPT]                          # Preconfigure for selected JavaScript library
                                                         # Default: jquery
  -J, [--skip-javascript], [--no-skip-javascript]        # Skip JavaScript files
      [--dev], [--no-dev]                                # Setup the application with Gemfile pointing to your Rails checkout
      [--edge], [--no-edge]                              # Setup the application with Gemfile pointing to Rails repository
      [--skip-turbolinks], [--no-skip-turbolinks]        # Skip turbolinks gem
  -T, [--skip-test-unit], [--no-skip-test-unit]          # Skip Test::Unit files
      [--rc=RC]                                          # Path to file containing extra configuration options for rails command
      [--no-rc], [--no-no-rc]                            # Skip loading of extra configuration options from .railsrc file

如果我触发了 rails new test_1 -B。它会跳过捆绑安装。

Here what is [--no-skip-bundle]

Answer 1

有时我们已经安装了 gems（通过执行 gem install 或因为我们之前创建了一个 rails 项目）并且每次等待 bundle install 执行有点烦人我们创建一个新项目。在这种情况下，我们可以通过在创建 rails 项目时向命令添加 --skip-bundle 来跳过捆绑执行。

--no-skip-bundle与--skip-bundle

正好相反

其他用例：跳过捆绑包的其他用例是如果你想在特定的地方安装 gem gemset which will be created after generating Rails app. (source)

了解 rails 命令选项参数

Understanding rails command option argument

ruby

ruby-on-rails

ruby-on-rails-4