Rails g 遷移不起作用

Question

當我運行命令時

rails g migration migration_name

我會收到“錯誤”消息：

Usage:
  rails new APP_PATH [options]

Options:
  -r, [--ruby=PATH]              # Path to the Ruby binary of your choice
                                 # Default: /Users/radek/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
  -b, [--builder=BUILDER]        # Path to a application builder (can be a filesystem path or URL)
  -m, [--template=TEMPLATE]      # Path to an application template (can be a filesystem path or URL)
      [--skip-gemfile]           # Don't create a Gemfile
      [--skip-bundle]            # Don't run bundle install
  -G, [--skip-git]               # Skip Git ignores and keeps
  -O, [--skip-active-record]     # Skip Active Record files
  -S, [--skip-sprockets]         # Skip Sprockets files
  -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]        # Skip JavaScript files
      [--dev]                    # Setup the application with Gemfile pointing to your Rails checkout
      [--edge]                   # Setup the application with Gemfile pointing to Rails repository
  -T, [--skip-test-unit]         # Skip Test::Unit files
      [--old-style-hash]         # Force using old style hash (:foo => 'bar') on Ruby >= 1.9

Runtime options:
  -f, [--force]    # Overwrite files that already exist
  -p, [--pretend]  # Run but do not make any changes
  -q, [--quiet]    # Suppress status output
  -s, [--skip]     # Skip files that already exist

Rails options:
  -h, [--help]     # Show this help message and quit
  -v, [--version]  # Show Rails version number and quit

Description:
    The 'rails new' command creates a new Rails application with a default
    directory structure and configuration at the path you specify.

    You can specify extra command-line arguments to be used every time
    'rails new' runs in the .railsrc configuration file in your home directory.

    Note that the arguments specified in the .railsrc file don't affect the
    defaults values shown above in this help message.

Example:
    rails new ~/Code/Ruby/weblog

    This generates a skeletal Rails installation in ~/Code/Ruby/weblog.
    See the README in the newly created application to get going.

這是我第一次收到這條消息。 在其他項目中，此命令運行良好，但在這里我仍然收到此消息...

是什么原因造成的？ 我錯過了什么嗎？ （是的，我在相應項目的根目錄中）

Answer 1

您不是在 rails 生成的項目目錄中運行它。 你在它外面運行它。

編輯：也可能是缺少腳本文件夾。 或者，如果您在項目文件夾中執行它，則腳本文件夾中缺少 rails 腳本。

Answer 2

我有同樣的問題，我通過以下方式修復：

cd /root/path/to/your/project

bundle install

bundle update

瞧:)

Answer 3

嘗試將名為script的文件夾添加到您的 rails 根目錄。

在此文件夾中添加一個名為rails的文件並添加到其中

APP_PATH = File.expand_path('../../config/application', FILE )

需要 File.expand_path('../../config/boot', FILE )

需要“導軌/命令”

並再次執行

rails g migration migration_name