1 files changed, 21 insertions, 0 deletions
diff --git a/lib/gitlab/database/schema_validation/validators/missing_foreign_keys.rb b/lib/gitlab/database/schema_validation/validators/missing_foreign_keys.rb
new file mode 100644
index 00000000000..b20f8474426
--- /dev/null
+++ b/lib/gitlab/database/schema_validation/validators/missing_foreign_keys.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Database
+    module SchemaValidation
+      module Validators
+        class MissingForeignKeys < BaseValidator
+          ERROR_MESSAGE = "The foreign key %s is missing from the database"
+
+          def execute
+            structure_sql.foreign_keys.filter_map do |structure_sql_fk|
+              next if database.foreign_key_exists?(structure_sql_fk.name)
+
+              build_inconsistency(self.class, structure_sql_fk, nil)
+            end
+          end
+        end
+      end
+    end
+  end
+end