Add a log file to track deleted duplicate records

It might be interesting in some cases to check the information related
to those records.

app/lib/duplicate_records_logger.rb

@@ -0,0 +1,21 @@
+class DuplicateRecordsLogger
+  def info(message)
+    logger.info(message)
+  end
+
+  def logger
+    @logger ||= ActiveSupport::Logger.new(log_file).tap do |logger|
+      logger.formatter = Rails.application.config.log_formatter
+    end
+  end
+
+  private
+
+    def log_file
+      File.join(File.dirname(Rails.application.config.default_log_file), log_filename)
+    end
+
+    def log_filename
+      "duplicate_records.log"
+    end
+end

lib/tasks/polls.rake

@@ -2,6 +2,8 @@ namespace :polls do
   desc "Removes duplicate poll voters"
   task remove_duplicate_voters: :environment do
     logger = ApplicationLogger.new
+    duplicate_records_logger = DuplicateRecordsLogger.new
+
     logger.info "Removing duplicate voters in polls"
 
     Tenant.run_on_each do
@@ -16,10 +18,12 @@ namespace :polls do
           voter.delete
 
           tenant_info = " on tenant #{Tenant.current_schema}" unless Tenant.default?
-          logger.info "Deleted duplicate record with ID #{voter.id} " \
+          log_message = "Deleted duplicate record with ID #{voter.id} " \
                         "from the #{Poll::Voter.table_name} table " \
                         "with user_id #{user_id} " \
                         "and poll_id #{poll_id}" + tenant_info.to_s
+          logger.info(log_message)
+          duplicate_records_logger.info(log_message)
         end
       end
     end