Theo's Typesafe Cult•2y ago

How to handle Failing Unique Constraints?

I am wondering how to handle those on a practical level. I have a frontend, where I can import lists of items into my database (prisma + mysql on planetscale). Right now, when a unique constraint fails, the whole import will fail. 1) Is there a way for me to tell my frontend, what item on the list failed the unique constraint? Right now I get:

Invalid `prisma.list.create()` invocation:
Unique constraint failed on the (not available)
    at TRPCClientError.from (transformResult-106791

Invalid `prisma.list.create()` invocation:
Unique constraint failed on the (not available)
    at TRPCClientError.from (transformResult-106791

2) Is there a way in the backend (i.e. prisma) where I can say that I want it to try to use a certain id, but if that fails (as a backup) generate a new id, instead of failing completely?

3 Replies

bagfaceguy•7mo ago

Hey man did you find a way to solve this?

Bumble•7mo ago

You can try/catch and check for this error (check docs for exact error code) and handle as you want. The most common approach is to try to read a record from the db with this id. If it returns something, then generate a new one. If it doesn't, you can safely insert it into db.

bagfaceguy•7mo ago

Alright man thanks

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How to handle Failing Unique Constraints?