Make the gem work without ActiveRecord

.gitignore

@@ -8,5 +8,6 @@
 /spec/dummy/log/*.log
 /spec/dummy/storage/
 /spec/dummy/tmp/
+.DS_Store
 .rspec_status
 .yardoc

lib/dfe/analytics.rb

@@ -4,13 +4,10 @@
 require 'i18n'
 require 'httparty'
 require 'google/cloud/bigquery'
+require 'dfe/analytics/activerecord' if defined?(ActiveRecord)
 require 'dfe/analytics/event_schema'
 require 'dfe/analytics/fields'
 require 'dfe/analytics/entities'
-require 'dfe/analytics/services/entity_table_checks'
-require 'dfe/analytics/services/checksum_calculator'
-require 'dfe/analytics/services/generic_checksum_calculator'
-require 'dfe/analytics/services/postgres_checksum_calculator'
 require 'dfe/analytics/shared/service_pattern'
 require 'dfe/analytics/event'
 require 'dfe/analytics/event_matcher'
@@ -28,7 +25,6 @@
 require 'dfe/analytics/big_query_api'
 require 'dfe/analytics/big_query_legacy_api'
 require 'dfe/analytics/azure_federated_auth'
-require 'dfe/analytics/transaction_changes'
 
 module DfE
   module Analytics
@@ -96,19 +92,21 @@ def self.configure
     end
 
     def self.initialize!
-      unless defined?(ActiveRecord)
-        # bail if we don't have AR at all
-        Rails.logger.error('ActiveRecord not loaded; DfE Analytics not initialized')
-        return
-      end
-
       unless Rails.env.production? || File.exist?(Rails.root.join('config/initializers/dfe_analytics.rb'))
         message = "Warning: DfE Analytics is not set up. Run: 'bundle exec rails generate dfe:analytics:install'"
         Rails.logger.error(message)
         puts message
         return
       end
 
+      if defined?(ActiveRecord)
+        setup_entities
+      else
+        Rails.logger.info('ActiveRecord not loaded; DfE Analytics will only track non-database requests.')
+      end
+    end
+
+    def self.setup_entities
       if Rails.version.to_f > 7.1
         ActiveRecord::Base.with_connection do |connection|
           raise ActiveRecord::PendingMigrationError if connection.pool.migration_context.needs_migration?

lib/dfe/analytics/activerecord.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+require 'dfe/analytics/services/entity_table_checks'
+require 'dfe/analytics/services/checksum_calculator'
+require 'dfe/analytics/services/generic_checksum_calculator'
+require 'dfe/analytics/services/postgres_checksum_calculator'
+require 'dfe/analytics/transaction_changes'

spec/dfe/analytics_spec.rb

@@ -55,7 +55,7 @@
     it 'recovers and logs' do
       hide_const('ActiveRecord')
 
-      expect(Rails.logger).to receive(:error).with(/ActiveRecord not loaded/)
+      expect(Rails.logger).to receive(:info).with(/ActiveRecord not loaded; DfE Analytics will only track web requests/)
       expect { DfE::Analytics.initialize! }.not_to raise_error
     end
   end
@@ -330,4 +330,14 @@
       expect(DfE::Analytics.all_entities_in_application.first.to_s).to match(/with_model_candidates/)
     end
   end
+
+  describe 'when ActiveRecord is not available' do
+    before do
+      hide_const('ActiveRecord')
+    end
+
+    it 'initializes without errors' do
+      expect { DfE::Analytics.initialize! }.not_to raise_error
+    end
+  end
 end