RVM报告未安装Gemfile ruby

在我的Gemfile中,我指定了：

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

但进入我的Rails项目目录会使rvm抛出此错误：

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_version:1.7.9'

但是,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,我甚至可以选择rvm使用jruby和rails工作正常.

Gemfile中的ruby指令有问题吗？

我跟着official specification,这有一个非常相似的例子.

编辑：运行rvm install ruby​​-1.9.3,engine：jruby,engine_version：1.7.9在提示符下,rvm继续安装ruby-1.9.3-p484.再一次,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,engine_version:1.7.9'

解决方法

根据 this SO回答：

RVM has limited support of the ruby directive,you can use comment to overwrite what will be used by RVM.

通过增加：

#ruby=jruby-1.7.9

在ruby指令正下方的Gemfile中,rvm似乎能够选择正确的ruby：

$cd kotoba
RVM used your Gemfile for selecting Ruby,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]