The issue with your code is that the

locations

relation is not defined as an array. In Ory's permission model, relationships are always many-to-many, which means they should be defined as arrays. Here is the corrected code:

typescript class SubRoles implements Namespace{   related : {     members: User[]     locations: Location[]   } }

For more information, you can refer to the [Ory documentation](https://www.ory.sh/docs/keto/modeling/create-permission-model#define-relationships-in-the-opl) on defining relationships in the Ory Permission Language.

In Ory's permission model, relationships are always many-to-many. This is a fundamental aspect of the model and it's not possible to change it to a one-to-many or one-to-one relationship. The many-to-many relationship model is used to reflect the complex nature of permissions and access control in real-world applications. If you have a use case where a

SubRole

is related to only one

Location

, you would still define

locations

as an array in the Ory model, but only add one

Location

to this array for each

SubRole

. For more information, you can refer to the [Ory documentation](https://www.ory.sh/docs/keto/modeling/create-permission-model#define-relationships-in-the-opl) on defining relationships in the Ory Permission Language.