Prisma Patterns

Production patterns and non-obvious traps for Prisma ORM in TypeScript backends. Tested against Prisma 5.x and 6.x. Some behaviors differ from Prisma 4.

Check the Prisma version before applying version-specific patterns:

npx prisma --version

Prisma 5 introduced relationJoins, which can load relations via JOIN rather than separate queries depending on query strategy and configuration. The omit field modifier and prisma.$extends Client Extensions API were also added. Note: relationJoins can cause row explosion on large 1:N relations or deep nested include — benchmark both approaches when relations may return many rows per parent.

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