Cursor
database
Prisma Migration Fails After Schema Changes
After Cursor edited your Prisma schema, running migrations fails with errors. The schema changes can't be applied to the database.
The schema syntax may be invalid or incompatible with current data.
Error Messages You Might See
Invalid migration
Schema validation failed
Unique constraint violation
Field does not exist
Common Causes
- Invalid field types or model syntax in schema
- Relations incorrectly defined (missing @relation)
- Required field added without default to table with data
- Unique constraint added to column with duplicate values
- Enum values changed, conflicting with existing data
How to Fix It
Validate schema syntax in schema.prisma. Check Prisma docs for correct syntax. Create migration: npx prisma migrate dev. If fails, rollback: npx prisma migrate resolve --rolled-back [name]. Add defaults: String @default("default").
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Get HelpFrequently Asked Questions
How do I add a required field to existing table?
Add @default() or @updatedAt. Prisma will backfill existing rows. Then make it required in next migration.
Can I modify existing migrations?
No. Create new migration for changes. To redo, reset: npx prisma migrate reset (dev only).