1 files changed, 61 insertions, 0 deletions
diff --git a/app/models/concerns/integrations/has_data_fields.rb b/app/models/concerns/integrations/has_data_fields.rb
new file mode 100644
index 00000000000..e9aaaac8226
--- /dev/null
+++ b/app/models/concerns/integrations/has_data_fields.rb
@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+module Integrations
+  module HasDataFields
+    extend ActiveSupport::Concern
+
+    class_methods do
+      # Provide convenient accessor methods for data fields.
+      # TODO: Simplify as part of https://gitlab.com/gitlab-org/gitlab/issues/29404
+      def data_field(*args)
+        args.each do |arg|
+          self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
+            unless method_defined?(arg)
+              def #{arg}
+                data_fields.send('#{arg}') || (properties && properties['#{arg}'])
+              end
+            end
+
+            def #{arg}=(value)
+              @old_data_fields ||= {}
+              @old_data_fields['#{arg}'] ||= #{arg} # set only on the first assignment, IOW we remember the original value only
+              data_fields.send('#{arg}=', value)
+            end
+
+            def #{arg}_touched?
+              @old_data_fields ||= {}
+              @old_data_fields.has_key?('#{arg}')
+            end
+
+            def #{arg}_changed?
+              #{arg}_touched? && @old_data_fields['#{arg}'] != #{arg}
+            end
+
+            def #{arg}_was
+              return unless #{arg}_touched?
+              return if data_fields.persisted? # arg_was does not work for attr_encrypted
+
+              legacy_properties_data['#{arg}']
+            end
+          RUBY
+        end
+      end
+    end
+
+    included do
+      has_one :issue_tracker_data, autosave: true, inverse_of: :integration, foreign_key: :service_id, class_name: 'Integrations::IssueTrackerData'
+      has_one :jira_tracker_data, autosave: true, inverse_of: :integration, foreign_key: :service_id, class_name: 'Integrations::JiraTrackerData'
+      has_one :open_project_tracker_data, autosave: true, inverse_of: :integration, foreign_key: :service_id, class_name: 'Integrations::OpenProjectTrackerData'
+
+      def data_fields
+        raise NotImplementedError
+      end
+
+      def data_fields_present?
+        data_fields.present?
+      rescue NotImplementedError
+        false
+      end
+    end
+  end
+end