Rails G迁移不起作用

本文介绍了Rails G迁移不起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

当我运行命令时

跟踪g迁移migration_name

rails g migration migration_name

我将收到错误"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.

这是我第一次收到此消息.在其他项目中，此命令效果很好，但是在这里我仍然收到此消息...

It's first time when I got this message. In other projects this command works well, but here I am still getting this message...

是什么原因造成的?我想念什么吗? (是的，我在相应项目的根目录中)

What caused that? Am I missing something? (yes, I am in the root of the respective project)

推荐答案

您没有在Rails生成的项目目录中运行它.您正在外部运行它.

You are not running it inside a rails generated project directory. You are running it outside it.

也可能是脚本文件夹丢失的情况.或者，如果在项目文件夹中执行脚本，则脚本文件夹中缺少rails脚本.

It could also be if the script folder is missing. Or the rails script is missing inside the script folder if you are executing it inside the project folder.