1 files changed, 87 insertions, 0 deletions
diff --git a/db/post_migrate/20230804053643_add_ticket_work_item_type.rb b/db/post_migrate/20230804053643_add_ticket_work_item_type.rb
new file mode 100644
index 00000000000..4d40622dfb4
--- /dev/null
+++ b/db/post_migrate/20230804053643_add_ticket_work_item_type.rb
@@ -0,0 +1,87 @@
+# frozen_string_literal: true
+
+class AddTicketWorkItemType < Gitlab::Database::Migration[2.1]
+  disable_ddl_transaction!
+  restrict_gitlab_migration gitlab_schema: :gitlab_main
+
+  ISSUE_ENUM_VALUE = 0
+  TICKET_ENUM_VALUE = 8
+  TICKET_NAME = 'Ticket'
+  TICKET_WIDGETS = {
+    'Assignees' => 0,
+    'Description' => 1,
+    'Hierarchy' => 2,
+    'Labels' => 3,
+    'Milestone' => 4,
+    'Notes' => 5,
+    'Start and due date' => 6,
+    'Health status' => 7,
+    'Weight' => 8,
+    'Iteration' => 9,
+    'Notifications' => 14,
+    'Current user todos' => 15,
+    'Award emoji' => 16
+  }.freeze
+
+  class MigrationWorkItemType < MigrationRecord
+    self.table_name = 'work_item_types'
+  end
+
+  class MigrationWidgetDefinition < MigrationRecord
+    self.table_name = 'work_item_widget_definitions'
+  end
+
+  class MigrationHierarchyRestriction < MigrationRecord
+    self.table_name = 'work_item_hierarchy_restrictions'
+  end
+
+  def up
+    # New instances will not run this migration and add this type via fixtures
+    # checking if record exists mostly because migration specs will run all migrations
+    # and that will conflict with the preloaded base work item types
+    existing_ticket_work_item_type = MigrationWorkItemType.find_by(base_type: TICKET_ENUM_VALUE, namespace_id: nil)
+
+    return say('Ticket work item type record exists, skipping creation') if existing_ticket_work_item_type
+
+    new_ticket_work_item_type = MigrationWorkItemType.create(
+      name: TICKET_NAME,
+      namespace_id: nil,
+      base_type: TICKET_ENUM_VALUE,
+      icon_name: 'issue-type-issue'
+    )
+
+    return say('Ticket work item type create record failed, skipping creation') if new_ticket_work_item_type.new_record?
+
+    widgets = TICKET_WIDGETS.map do |widget_name, widget_enum_value|
+      {
+        work_item_type_id: new_ticket_work_item_type.id,
+        name: widget_name,
+        widget_type: widget_enum_value
+      }
+    end
+
+    MigrationWidgetDefinition.upsert_all(
+      widgets,
+      unique_by: :index_work_item_widget_definitions_on_default_witype_and_name
+    )
+
+    issue_type = MigrationWorkItemType.find_by(base_type: ISSUE_ENUM_VALUE, namespace_id: nil)
+    return say('Issue work item type not found, skipping hierarchy restrictions creation') unless issue_type
+
+    restrictions = [
+      { parent_type_id: new_ticket_work_item_type.id, child_type_id: new_ticket_work_item_type.id, maximum_depth: 1 },
+      { parent_type_id: new_ticket_work_item_type.id, child_type_id: issue_type.id, maximum_depth: 1 }
+    ]
+
+    MigrationHierarchyRestriction.upsert_all(
+      restrictions,
+      unique_by: :index_work_item_hierarchy_restrictions_on_parent_and_child
+    )
+  end
+
+  def down
+    # There's the remote possibility that issues could already be
+    # using this issue type, with a tight foreign constraint.
+    # Therefore we will not attempt to remove any data.
+  end
+end