Add local variable to response_to render view

I currently have the following code and it works great:

respond_to do |format|
  format.json { render :show, status: :ok }
end

      

        
        
        
      

    

I believe this is :show

referring to the jbuilder view.

However, if I wanted to add a local variable to the json rendering, how would I do it?

I tried the following but it didn't work.

auth = true
format.json { render :show, :include => auth, status: :ok }

      

        
        
        
      

    

and i also tried

auth = true
format.json { render :show.include(auth), status: ok }

      

        
        
        
      

    

From what I found in render: json takes no parameters