Based on the knowledge sources provided, it appears that defining a permission on the User namespace to check if the user is equal to the subject is possible in Ory Permissions (Keto). However, I'll need to explain this with some caveats and provide you with the best approach based on the available information. In Ory Permissions, namespaces are used to scope objects and subjects, and they contain rules that define which relationships are looked up as part of a permission check [Namespaces](https://www.ory.sh/docs/keto/concepts/namespaces). The User namespace is typically defined as follows:

typescript class User implements Namespace {}

To define a permission that checks if the user is equal to the subject, you would need to add a

permits

section to the User namespace. However, it's important to note that the typical use case for permissions is to check access to resources rather than equality of users. That being said, you could potentially implement this check using the Ory Permission Language (OPL) as follows:

typescript class User implements Namespace {   permits = {     isSelf: (ctx: Context): boolean =>        ctx.subject === this.id // Assuming 'id' is a property of the User object   } }

This permission would check if the subject of the context (the user making the request) is the same as the id of the User object on which the permission is being checked. However, it's crucial to understand that this approach might not be the most idiomatic way to use Ory Permissions. Typically, permissions are defined on resource objects (like documents, folders, etc.) rather than on users themselves [Ory Permission Language](https://www.ory.sh/what-is-the-ory-permission-language/#the-ory-permission-language). If your goal is to implement user-specific checks, you might want to consider defining these checks in your application logic rather than in the permission model. Ory Permissions is primarily designed for managing access control to resources, not for user identity comparisons. For a more standard approach to permissions in Ory, you might want to look at how permissions are typically defined on resource objects, as shown in this example [Define permissions in the OPL](https://www.ory.sh/docs/keto/modeling/create-permission-model#define-permissions-in-the-opl). Remember, the exact implementation might depend on your specific use case and the overall structure of your permission model. If you need more detailed guidance, you may want to consult the Ory documentation or reach out to the Ory community for specific advice on your use case.

@chilly-king-10285 how do we make id the property of the user?

To make

id

a property of the User namespace in Ory Permissions, you need to define it in the class structure using the Ory Permission Language (OPL). Here's how you can modify the User namespace to include an

id

property:

typescript class User implements Namespace {   related: {     id: string   }    permits = {     isSelf: (ctx: Context): boolean =>        ctx.subject === this.related.id   } }

In this example, we've added the

id

as a property within the

related

object of the User namespace. The

related

object is used to define relationships and properties for the namespace [Ory Permission Language](https://www.ory.sh/docs/keto/reference/ory-permission-language). However, it's important to note a few things: 1. This approach is not typical for Ory Permissions. Usually, the system is designed to manage permissions on resources, not to compare user identities. 2. The

id

property in this context is not automatically populated. You would need to create and manage these relationships manually using the Ory Permissions API. 3. This setup might not be the most efficient way to perform user identity checks. It's generally recommended to handle such checks in your application logic rather than in the permission model. If you're looking to implement user-specific checks or comparisons, you might want to reconsider your approach. Ory Permissions is primarily designed for managing access control to resources, not for user identity management or comparison [How to integrate permission checks to your application](https://www.ory.sh/docs/keto/guides/simple-access-check-guide). For most use cases, it's more common to define permissions on resource objects (like documents, files, etc.) rather than on users themselves. If you need to perform user identity checks, it's usually better to do this in your application logic, possibly using other Ory products like Ory Identities for authentication and identity management. Remember, the exact implementation should align with your specific use case and overall system architecture. If you're unsure about the best approach, you may want to consult the Ory documentation further or reach out to the Ory community for advice tailored to your specific needs.