rubymine complaining about rails controller scaffold syntax

I'm scaffolding with rails, and the following code is being generated

format.json { render json: @leg, status: :created, location: @leg }

But RubyMine is complaining unless I switch it to

format.json { render :json => @leg, :status => :created, :location => @leg }

Can anyone elaborate?

Answers suggests that you set the SDK to ruby 1.9 to get this working.

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