While debugging a rails application, how can I get the full name of a variable from the debugger?

I am debugging my rails application and I am on the debugger console. I want to be able to get the value of a certain variable in my application. I could use the RIght Click Copy Name method but if it is a huge object with several nested objects etc, and I want the name of the variable down the hierarchy, the Copy Name method doesn't help. It just returns the name of the current attribute, not the entire path. I tried other methods such as Evaluate Expression and so on, but they are not too helpful either. Please see the attached screen shot. I want to get the name of the variable tmpname in its entirety, starting from params.

Please help me.