1 files changed, 38 insertions, 0 deletions
diff --git a/app/services/issuable/export_csv/base_service.rb b/app/services/issuable/export_csv/base_service.rb
new file mode 100644
index 00000000000..49ff05935c9
--- /dev/null
+++ b/app/services/issuable/export_csv/base_service.rb
@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+module Issuable
+  module ExportCsv
+    class BaseService
+      # Target attachment size before base64 encoding
+      TARGET_FILESIZE = 15.megabytes
+
+      def initialize(issuables_relation, project)
+        @issuables = issuables_relation
+        @project = project
+      end
+
+      def csv_data
+        csv_builder.render(TARGET_FILESIZE)
+      end
+
+      private
+
+      attr_reader :project, :issuables
+
+      # rubocop: disable CodeReuse/ActiveRecord
+      def csv_builder
+        @csv_builder ||=
+          CsvBuilder.new(issuables.preload(associations_to_preload), header_to_value_hash)
+      end
+      # rubocop: enable CodeReuse/ActiveRecord
+
+      def associations_to_preload
+        []
+      end
+
+      def header_to_value_hash
+        raise NotImplementedError
+      end
+    end
+  end
+end