How to upgrade to Prisma 4

This repository is used in our live stream to show how to easily upgrade to Prisma 4: https://www.youtube.com/watch?v=FSjkBrfaoEY

Slides can be found here.

ℹ️ Most breaking changes in Prisma 4 are edge cases or easy to address.
We expect a very smooth upgrade process for the majority of our users.

1. fix validation errors in Prisma Schema if applicable
2. adopt new capabilities in Prisma Schema if applicable
3. fix Prisma Client if applicable

How to alternate between Prisma version

For demo purposes there is two sub folders which host Prisma 3.x and 4.x version of the CLI.

We can then use the --schema argument to validate the same schema in prisma/schema.prisma from those sub folders.

Navigate in either of the sub folders and run

npx prisma validate --schema=../prisma/schema.prisma

Schemas step-by-step

There is multiple schema files in this repo reflecting the upgrade steps demoed.

1. prisma/1-schema-validation-start.prisma - start state from Prisma 3 which is invalid in Prisma 4
2. prisma/2-schema-validation-end.prisma - end state with all validation errors fixed
3. prisma/3-schema-defaults.prisma - end state with list defaults
4. prisma/2-schema-index.prisma - end state using index type