RVM报告未安装Gemfile ruby

Question

在我的Gemfile中，我指定了：

ruby '1.9.3', engine: 'jruby', engine_version: '1.7.9'

但是进入我的Rails项目目录会使rvm抛出以下错误：

RVM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
you can ignore these warnings with 'rvm rvmrc warning ignore /home/petey/rails/kotoba/Gemfile'.
To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.
ruby-1.9.3,engine:jruby,engine_version:1.7.9 is not installed.
To install do: 'rvm install ruby-1.9.3,engine:jruby,engine_version:1.7.9'

然而，我确实安装了jruby 1.7.9：

$ rvm list
rvm rubies
jruby-1.7.9 [ x86_64 ]
ruby-1.9.3-p392 [ x86_64 ]
=* ruby-2.0.0-p247 [ x86_64 ]
# => - current
# =* - current && default
#  * - default
$ rvm use jruby
Using /home/petey/.rvm/gems/jruby-1.7.9
$ ruby -v
jruby 1.7.9 (1.9.3p392) 2013-12-06 87b108a on OpenJDK 64-Bit Server VM 1.7.0_25-b30 [linux-amd64]

事实上，我甚至可以用rvm use jruby选择它，rails工作得很好。

Gemfile中的ruby指令有问题吗？

我遵循了官方规范，其中有一个非常相似的例子。

---

编辑：在提示符下运行rvm install ruby-1.9.3,engine:jruby,engine_version:1.7.9时，rvm继续安装ruby-1.9.3-p484。再次，它在进入项目目录时显示相同的错误消息：

RVM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
you can ignore these warnings with 'rvm rvmrc warning ignore /home/petey/rails/kotoba/Gemfile'.
To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.
ruby-1.9.3,engine:jruby,engine_version:1.7.9 is not installed.
To install do: 'rvm install ruby-1.9.3,engine:jruby,engine_version:1.7.9'

Answer 1

根据这个SO答案：

RVM对ruby指令的支持有限，您可以使用注释来覆盖RVM将使用的内容。

---

通过添加：

#ruby=jruby-1.7.9

对于ruby指令下方的Gemfile，rvm似乎能够选择正确的ruby：

$ cd kotoba
RVM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
you can ignore these warnings with 'rvm rvmrc warning ignore /home/petey/rails/kotoba/Gemfile'.
To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.
$ ruby -v
jruby 1.7.9 (1.9.3p392) 2013-12-06 87b108a on OpenJDK 64-Bit Server VM 1.7.0_25-b30 [linux-amd64]