Ruby ternary operator and method call

问题

I am using ruby 2.1.5, facing some problem with ternary operator

Syntax error

request.xhr?  ? render :json => "success"  : redirect_to index_url

working

request.xhr?  ? render(:json => "success") : redirect_to(index_url)

Can some please explain How its works and why above one not working? Thanks in advance

回答1:

When you use the shorthand syntax (without brackets), ruby expects everything until the end of the line to be parameters to your method. So your "syntax error" example is understood as:

request.xhr?  ? render(:json => "success"  : redirect_to index_url)

which is obviously wrong.

来源：https://stackoverflow.com/questions/30070319/ruby-ternary-operator-and-method-call