[Rails5] Disable inheritance_column for Gitlab::Database::RenameReservedPathsMigration::V1::MigrationClasses::Namespaceblackst0ne-rails5-invalid-single-table-inheritance-type-group-is-not-a-subclass-of-namespace

2 files changed, 7 insertions, 0 deletions

diff --git a/changelogs/unreleased/blackst0ne-rails5-invalid-single-table-inheritance-type-group-is-not-a-subclass-of-namespace.yml b/changelogs/unreleased/blackst0ne-rails5-invalid-single-table-inheritance-type-group-is-not-a-subclass-of-namespace.yml
new file mode 100644
index 00000000000..92e6ce35941
--- /dev/null
+++ b/changelogs/unreleased/blackst0ne-rails5-invalid-single-table-inheritance-type-group-is-not-a-subclass-of-namespace.yml
@@ -0,0 +1,6 @@
+---
+title: "[Rails5] Invalid single-table inheritance type: Group is not a subclass of
+  Namespace"
+merge_request: 19918
+author: "@blackst0ne"
+type: fixed
diff --git a/lib/gitlab/database/rename_reserved_paths_migration/v1/migration_classes.rb b/lib/gitlab/database/rename_reserved_paths_migration/v1/migration_classes.rb
index 62d4d0a92a6..26ae6966746 100644
--- a/lib/gitlab/database/rename_reserved_paths_migration/v1/migration_classes.rb
+++ b/lib/gitlab/database/rename_reserved_paths_migration/v1/migration_classes.rb
@@ -37,6 +37,7 @@ module Gitlab
           class Namespace < ActiveRecord::Base
             include MigrationClasses::Routable
             self.table_name = 'namespaces'
+            self.inheritance_column = :_type_disabled
             belongs_to :parent,
                        class_name: "#{MigrationClasses.name}::Namespace"
             has_one :route, as: :source