[Solved] You wrote this PrismaService method but get a runtime error: async getUser(id: number) { return this.prisma.user.findUnique({ where: { id } }); } What is the likely cause? | NestJS

NestJS - Database with Prisma

You wrote this PrismaService method but get a runtime error:

async getUser(id: number) {
  return this.prisma.user.findUnique({ where: { id } });
}

What is the likely cause?

AThe id parameter type should be string, not number

BPrismaClient is not instantiated in the service

CfindUnique requires a unique field, id might not be unique

DMissing await before the findUnique call

Step-by-Step Solution

Solution:

Step 1: Check PrismaClient instantiation
If PrismaClient is not instantiated or injected, calling this.prisma.user.findUnique causes runtime error.
Step 2: Validate other options
Id is usually a number and unique; missing await causes Promise but not runtime error.
Final Answer:
PrismaClient is not instantiated in the service -> Option B
Quick Check:
Runtime error often means PrismaClient not instantiated [OK]

Quick Trick: Always instantiate PrismaClient before using it in service [OK]

Common Mistakes:

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