Why will macvim always use ruby ​​1.9.3?

I installed yadr dotfiles , vim plugin suite, ruby, etc.

I have the following line of Ruby code in a file foo.rb

:

foo: bar

Note. I used the ruby ​​1.9.3 syntax to assign / define a symbol.

When I start macvim from the command line with mvim foo.rb

and save this file everything works fine.

However, when I open macvim using open -a macvim

, and navigate and open foo.rb

, when I try to save the file, I get a ruby-vim syntax error on foo: bar

. When I change it to :foo => bar

, I don't get syntax errors.

• Using open -a macvim
  
  to open macvim and then type :!ruby -v
  
  printsruby 1.8.7
  
  
• Using mvim .
  
  to open macvim and then type :!ruby -v
  
  printsruby 1.9.3
  
  

Depending on how I open macvim, I get a different Ruby version. How can I ensure that macvim always uses ruby ​​1.9.3 to evaluate my ruby ​​code?

thank