Is there a way to find which line of code generated a MySQL statement in a Rails development log?

In order to do some performance optimization, I would like to find which part of my app is creating which MySQL queries. When I take a look at my log, I see hundres of queries flashing around on each web request I do, and I need to find out where they come from.

I'm thinking about adding some variables like ____FILE____ and ____LINE____ to the log output.

Is that possible?

mysql ruby-on-rails logging performance-testing backtrace
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