How can I disconnect a relation by using it's fields?

I need to disconnect a relation, but I cannot access the actual relation field due to the way it is setup.
Let's say there is a relation called

author

author

, and I only have access to

authorId

authorId

, can I disconnect it by setting

authorId

authorId

to null/undefined?

How can I disconnect a relation by using it's fields? - Prisma