安装 Rails 3 后如何使用 Rails 2.3 应用程序生成器? [英] How to use the Rails 2.3 app generator when I have Rails 3 installed?

问题描述

澄清:只有一个 rails 命令，它是从最新的 Rails gem 安装的，它是 Rails 3 ATM.但是，我需要创建一个 Rails 2.3 应用程序.

to clarify: there's only one rails command, which gets installed from the latest Rails gem, which is Rails 3 ATM. However, I'm required to create a Rails 2.3 app.

运行 ruby/usr/local/lib/ruby/gems/1.8/gems/rails-2.3.8/bin/rails 失败并出现 NoMethodError，我想是因为它也尝试使用 gems从 3.0.0 版本开始.

Running ruby /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.8/bin/rails fails with a NoMethodError, I suppose because it also tries to use gems from the 3.0.0 release.

卸载 gem 会产生一些奇怪的结果:

Uninstalling the gem produces some strange results:

$ gem uninstall rails-3.0.0  
ERROR:  While executing gem ... (Gem::InstallError)
    cannot uninstall, check `gem list -d rails-3.0.0`

$ gem list -d rails-3.0.0  

*** LOCAL GEMS ***
(and no gems here)

我该怎么办?

推荐答案

最简单的方法是:

1. 为项目创建目录

2. 创建一个包含

1. Create the directory for the project

2. Create a Gemfile there containing

gem "rails", "2.3.9"
gem "sqlite3-ruby", :require => "sqlite3"

运行捆绑安装

您甚至不需要 rvm 来执行此操作.

You don't even need rvm to do this.

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