Updating data in M:N relation

I have two models:

model Post {
  id            String         @id @default(cuid())
  title         String
  categories    Category[]
}

model Category {
  id      String        @id @default(cuid())
  name    String
  posts   Post[]
}

Category is defined before the post is created. Creating post itself is fine, the connections in _CategoryToPost table are created. The problem arises when trying to update the post categories. What happens is that the old ones are not deleted and the new ones are added to the _CategoryToPost table. So if I update post and I don’t make any change to the post categories, they duplicate in the _CategoryToPost table.

The code for updating is following:

                const updatedPost = await photon.posts.update({
                    where: { id: args.id },
                    data: {
                        title: args.title,
                        categories: {
                            connect: args.categories.map(categoryId => ({
                                id: categoryId
                            }))
                        }
                    }
                });

[pantharshit00]

I can confirm this bug.

It will be fixed via a big refactoring that we are currently doing.

Additional context from slack:

[cypcz]

Indeed, you are right. Works fine. Thank you!