Pass installment to the processing error handler

This way we can provide more flexibility on things that can be
done when an error occurs.

In the provided RailsLogger handler, we'll also print the ID
of the installment.

app/jobs/solidus_subscriptions/process_installment_job.rb

@@ -7,7 +7,7 @@ class ProcessInstallmentJob < ApplicationJob
     def perform(installment)
       Checkout.new(installment).process
     rescue StandardError => e
-      SolidusSubscriptions.configuration.processing_error_handler&.call(e)
+      SolidusSubscriptions.configuration.processing_error_handler&.call(e, installment)
     end
   end
 end

lib/solidus_subscriptions/processing_error_handlers/rails_logger.rb

@@ -3,18 +3,20 @@
 module SolidusSubscriptions
   module ProcessingErrorHandlers
     class RailsLogger
-      def self.call(exception)
-        new(exception).call
+      def self.call(exception, installment = nil)
+        new(exception, installment).call
       end
 
-      attr_reader :exception
+      attr_reader :exception, :installment
 
-      def initialize(exception)
+      def initialize(exception, installment = nil)
         @exception = exception
+        @installment = installment
       end
 
       def call
-        Rails.logger.error exception.message
+        Rails.logger.error("Error processing installment with ID=#{installment.id}:") if installment
+        Rails.logger.error(exception.message)
       end
     end
   end

spec/jobs/solidus_subscriptions/process_installment_job_spec.rb

@@ -12,17 +12,19 @@
   end
 
   context 'when handling #perform errors' do
-    it 'by default logs exception data without raising exceptions' do
+    it 'by default logs exception data without raising exceptions' do # rubocop:disable RSpec/MultipleExpectations
+      installment = build_stubbed(:installment)
       checkout = instance_double(SolidusSubscriptions::Checkout).tap do |c|
         allow(c).to receive(:process).and_raise('test error')
       end
       allow(SolidusSubscriptions::Checkout).to receive(:new).and_return(checkout)
       allow(Rails.logger).to receive(:error)
 
       expect {
-        described_class.perform_now(build_stubbed(:installment))
+        described_class.perform_now(installment)
       }.not_to raise_error
 
+      expect(Rails.logger).to have_received(:error).with("Error processing installment with ID=#{installment.id}:").ordered
       expect(Rails.logger).to have_received(:error).with("test error").ordered
     end