1 files changed, 34 insertions, 0 deletions
diff --git a/app/services/boards/lists/base_destroy_service.rb b/app/services/boards/lists/base_destroy_service.rb
new file mode 100644
index 00000000000..dc0247c40b0
--- /dev/null
+++ b/app/services/boards/lists/base_destroy_service.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module Boards
+  module Lists
+    # This class is used by issue and epic board lists
+    # for destroying a single list
+    class BaseDestroyService < Boards::BaseService
+      def execute(list)
+        unless list.destroyable?
+          return ServiceResponse.error(message: "Open and closed lists on a board cannot be destroyed.")
+        end
+
+        list.with_lock do
+          decrement_higher_lists(list)
+          list.destroy!
+        end
+
+        ServiceResponse.success
+      rescue StandardError => e
+        Gitlab::ErrorTracking.track_and_raise_for_dev_exception(e)
+        ServiceResponse.error(message: "List destroy failed.")
+      end
+
+      private
+
+      # rubocop: disable CodeReuse/ActiveRecord
+      def decrement_higher_lists(list)
+        list.board.lists.movable.where('position > ?', list.position)
+            .update_all('position = position - 1')
+      end
+      # rubocop: enable CodeReuse/ActiveRecord
+    end
+  end
+end