The code you provided seems to be trying to define a

Document

class in the Ory Permission Language (OPL), which is a subset of TypeScript. In this class, you're defining relationships (

owners

,

editors

,

viewers

,

deleters

) and permissions (

view

). However, you're trying to access a

members

relationship from the

Roles

namespace within the

viewers

relationship of the

Document

namespace. This is not directly possible because the

viewers

relationship in the

Document

namespace is defined as an array of

Roles

. To correct this, you would need to define a

members

relationship in the

Roles

namespace and then traverse this relationship when defining the

view

permission in the

Document

namespace. Here's an example of how you might do this, based on the information provided in the extracts:

typescript class Roles implements Namespace {   related: {     members: User[]   } }  class Document implements Namespace {   related: {     owners: Roles[]     editors: Roles[]     viewers: Roles[]     deleters: Roles[]   }   permits = {     view: (ctx: Context): boolean =>       this.related.viewers.traverse((role) => role.related.members.includes(ctx.subject))   } }

In this example, the

view

permission checks if the

subject

is a member of any of the

Roles

in the

viewers

relationship. Please note that this is a simplified example and you might need to adjust it based on your specific use case and the exact structure of your

Roles

and

User

namespaces. For more information, you can refer to the [Ory Keto documentation](https://www.ory.sh/docs/keto) and the [Ory Permission Language specification](https://www.ory.sh/docs/keto/reference/ory-permission-language).

The code you provided is defining a

Document

class in the Ory Permission Language (OPL), which is a subset of TypeScript. In this class, you're defining relationships (

owners

,

editors

,

viewers

,

deleters

) and a

view

permission. The

view

permission is defined as a function that checks if the

subject

is a member of any of the

Roles

in the

viewers

,

editors

, or

owners

relationships. It does this by traversing the

child

relationship within each

Role

. However, based on the information provided in the extracts, it's not clear what the

child

relationship in the

Roles

namespace is supposed to represent. If

child

is a relationship in the

Roles

namespace that points to other

Roles

, then your code seems to be correct. Here's your code with some formatting adjustments for readability:

typescript class Document implements Namespace {   related: {     owners: Roles[]     editors: Roles[]     viewers: Roles[]     deleters: Roles[]   }   permits = {     view: (ctx: Context): boolean =>       this.related.viewers.traverse((role) =>         role.related.child.traverse((subRole) =>           subRole.related.members.includes(ctx.subject))) ||        this.related.editors.traverse((role) =>         role.related.child.traverse((subRole) =>           subRole.related.members.includes(ctx.subject))) ||        this.related.owners.traverse((role) =>         role.related.child.traverse((subRole) =>           subRole.related.members.includes(ctx.subject)))   } }

Please note that this is based on the assumption that

child

is a valid relationship in the

Roles

namespace. You might need to adjust this based on your specific use case and the exact structure of your

Roles

namespace. For more information, you can refer to the [Ory Keto documentation](https://www.ory.sh/docs/keto) and the [Ory Permission Language specification](https://www.ory.sh/docs/keto/reference/ory-permission-language).

The error message you're seeing indicates that the

traverse

function is not recognized in the context where it's being used in your Ory Permission Language (OPL) code. The parser was expecting the

includes

function instead. Based on the information provided in the extracts, it seems that the

includes

function is used to check if a subject is included in a relationship. For example, in the

Document

class defined in the [Ory Permission Language documentation](https://www.ory.sh/docs/keto#ory-permission-language), the

includes

function is used like this:

typescript write: (ctx: Context): boolean => this.related.editors.includes(ctx.subject)

In this example,

this.related.editors.includes(ctx.subject)

checks if the

subject

is included in the

editors

relationship. However, the

traverse

function is not mentioned in the provided extracts. It's possible that

traverse

is not a valid function in OPL, or it might not be valid in the context where you're trying to use it. To resolve this error, you might need to replace

traverse

with

includes

or another valid function in OPL. If you're not sure what function to use, you might find it helpful to refer back to the [Ory Keto documentation](https://www.ory.sh/docs/keto) and the [Ory Permission Language specification](https://www.ory.sh/docs/keto/reference/ory-permission-language).

Based on the information provided in the extracts, there's no direct mention or example of using a nested

traverse

function in the Ory Permission Language (OPL). However, if

traverse

is a function that allows you to iterate over a relationship in OPL, a nested

traverse

might look something like this:

typescript this.related.viewers.traverse((role) =>   role.related.child.traverse((subRole) =>     subRole.related.members.includes(ctx.subject)))

In this example, the

traverse

function is used to iterate over the

viewers

relationship. For each

role

in

viewers

, the

traverse

function is used again to iterate over the

child

relationship. Finally, the

includes

function is used to check if the

subject

is included in the

members

relationship of the

subRole

. Please note that this is a hypothetical example and might not work in your specific use case. The exact syntax and functionality of the

traverse

function would depend on its definition in OPL. For more information, you can refer to the [Ory Keto documentation](https://www.ory.sh/docs/keto) and the [Ory Permission Language specification](https://www.ory.sh/docs/keto/reference/ory-permission-language).