Invalid state: Type User occurs more than once as the target of a relation

[Eggwise]

Hi folks 👋 ,

We use Oso for a large energy-provider in the Netherlands. We built our own data-filtering adapter for Strapi (nodeJS).
Works like a charm.

But now i come across a problem.
In the system we have users. Then we have a new entity: UserRelation, this defines a relationship between user A and user B.
Using this entity we can define relationships between users like, John is friend of Lisa. etc.

We have rules for reading, updating etc users and i want to re-use these when defining rules for UserRelations
So i define this rule for listing user relations on the /user-relations endpoint.

allow(user: User, "read", relation: UserRelation) if
    allow(user, "read", relation.user_from) and
    allow(user, "read", relation.user_to);

But now i get this error.

error: Invalid state: Type `User` occurs more than once as the target of a relation
OperationalError::InvalidState: Invalid state: Type `User` occurs more than once as the target of a relation

But this (incomplete) rule works:

allow(user: User, "read", relation: UserRelation) if
    allow(user, "read", relation.user_from);

Why is this behaviour? Is this something we can disable ? I would like to re-use my rules.

i use npm oso "^0.26.0"

Help much appreciated 🙏

[Eggwise]

#1531

[Eggwise]

Any news on this?

This also occurs when i have something like this:

#cant use this..#    Invalid state: Type `User` occurs more than once as the target of a relation

relation_is_within_organization(user: User, relation: UserRelation) if
   relation.type.organization.id = user.organization.id and
   relation.user_from.organization.id = user.organization.id and
   relation.user_to.organization.id = user.organization.id;

This is wierd, because this means i cannot make rules where i test multiple attributes on a user's value