edit

Author: alagram

spec/support/helpers.rb

@@ -1,9 +1,9 @@
 # See http://stackoverflow.com/a/22388177/1268016
 def count_queries(&block)
   count = 0
-  counter_fn = ->(name, started, finished, unique_id, payload) do
+  counter_fn = lambda do |_name, _started, _finished, _unique_id, payload|
     count += 1 unless %w[CACHE SCHEMA].include? payload[:name]
   end
-  ActiveSupport::Notifications.subscribed(counter_fn, 'sql.active_record', &block)
+  ActiveSupport::Notifications.subscribed(counter_fn, "sql.active_record", &block)
   count
 end