Let Rails display file names and line numbers for log activity.

descriptive_sql_load_log.rb

module ActiveRecord
  module ConnectionAdapters
    class AbstractAdapter
      protected

        # Turn:
        # User Load (6.3ms)  SELECT * FROM "users"
        # Into:
        # User Load /app/views/_partial.erb:27 (6.3ms) in `_app_views_partial_erb`  SELECT * FROM "users"

        # Rails 3.0
        def log_with_trace(sql, name = "SQL", &block)
          @stringified_rails_root ||= Rails.root.to_s
          if @logger && @logger.debug?
            c = caller.detect{|line| line !~ /(activerecord|active_support|__DELEGATION__|\/lib\/|\/vendor\/plugins|\/vendor\/gems)/i}
            c ||= caller.first
            c.gsub! @stringified_rails_root, ''
            name = "#{name} #{c}"
          end
          log_without_trace sql, name, &block
        end

        alias_method_chain :log, :trace
    end
  end
end