Mutations with disconnect=true on an relation that is not connected to anything fails with an error

[avatsaev]

Bug description

Error when disconnecting something that is not connected to anything with disconnect: true on Prisma V1

How to reproduce

Mutate an object with an unexisting relation by using disconnect: true

Example:

Data structure:

Object Book is related to object Author

Data:

Book with id:1 is NOT connected to an Author

book.author

// => null

Repro

Try to disconnect the author from the book id:1

mutation RemoveAuthor {
    updateBook(
        where: {id: 1},
        data: {
            author: {disconnect: true}
        }
    ) {
        id
    }
}

Error:

 Error: The relation BookAuthor has no node for the model Authir with the value 'x' for the field 'id' connected to a node for the model Book on your mutation path.

Expected behavior

Disconnecting something that is not connected should not fail with error, but should be silently ignored, at most log a warning.

Error message is not clear enough.

Prisma information

type Book {
   ...
   author: Author
   ...
}

type Author {
    ...
    books: [Book!]!
    ...

}

Environment & setup

• OS: LINUX
• Database: MySql
• Node.js version: 14

Prisma Version

V1

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