Using event.get to get variable initialized to string

Hi, I want to add some fields that will have the same values of others but with different names:
for Example the input json:

{"Environment" : "x", "Name" : "y"}

The output will be:

{"Environment" : "x", "Name" : "y", "environment" : "x ", "name" : "y"}

Because I have a lot of fields to add I tried to do some mapping before and use ruby:

    
   	ruby {
		code => '
			mapping = {"Environment":"environment", "Name": "name"}
			mapping.each do |old_field, new_field|
			   old_field_val = event.get(old_field)
              if old_field_val
				event.set(new_field, old_field_val)
			   end
           end
		'
   }

It seems like the event.get can't get variable but has to get string.
Is there any other way to do so?

Thanks

You should be getting the error message "Ruby exception occurred: no implicit conversion of Symbol into String". You can fix that using

old_field_val = event.get(old_field.to_s)

Thanks, it solved my problem!

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