You can manually specify id values and not have any default like this:

id        String   @id

In such a case, you would have to manually specify the id field when creating a new object. If you'd like to use some arbitrary database function to generate default values for the field, you can also take a look at dbgenerated().

In Prisma when you're creating a record using the create method it returns the newly created data along with all it's fields as a object. So after creating it you can access the newly created records id from there.

Here is an example:

const bundle = await db.bundles.create({
  data: {
    bundleTypeId: bundleType,
    discountTypeId: discountType,
    discountValue: discountVal,
  },
});


const bundleId = bundle.id;

I ran this as well. In order to include profile data after creating the user I did the following tweak.

const user = await prisma.user.create({
    data: {
        username: "username",
        emailEncrypted: "encrypted",
        emailIv: "iv",
        password: "hashedPassword",
        profile: {
            create: {},
        },
    },
    select: {
        id: true,
        createdAt: true,
        emailConfirmed: true,
        emailIv: true,
        emailEncrypted: true,
        isAdmin: true,
        isMod: true,
        password: true,
        profile: true,
        username: true,
    },
});

This outputs,

No issue it worked fine.

Still wondering what the issue you faced was.

Can you paste the error log ?.

So I actually found a solution to this. When I check my error again, I notice that my class id is a string which would be the reason why Prisma could not recognize the id itself. After doing some research I found a javascript function parseInt() which turn string into integer which I had done during codewar challenge from before. Not sure why my class id is not an integer, I will have to check my model again but this work.

const updateStudent = await prisma.student.update({
        where: {
            id: id
        },
        data: {
          firstName: firstName,
          lastName: lastName,
             classes: {
                create: {
                 class: {
                        connect: {
                            id: parseInt(classItem) //this is all it need
                        }
                    }