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You wrote this PrismaService method but get a runtime error: Cannot read property 'user' of undefined. What is the likely cause?

medium📝 Debug Q14 of 15
NestJS - Database with Prisma
You wrote this PrismaService method but get a runtime error: Cannot read property 'user' of undefined. What is the likely cause?
async getAllUsers() {
  return this.prisma.user.findMany();
}
Options:
AThe Prisma Client instance was not initialized in PrismaService
BThe user model is missing in the Prisma schema
CThe method should be static to access prisma
DfindMany() requires parameters and cannot be empty
Step-by-Step Solution
Solution:
  1. Step 1: Analyze error message

    'Cannot read property user of undefined' means this.prisma is undefined in the service.
  2. Step 2: Check PrismaService initialization

    Prisma Client must be instantiated and assigned to this.prisma in the constructor; missing this causes the error.
  3. Final Answer:

    The Prisma Client instance was not initialized in PrismaService -> Option A
  4. Quick Check:

    Uninitialized prisma client = undefined error [OK]
Quick Trick: Initialize prisma client in constructor to avoid undefined errors [OK]
Common Mistakes:
  • Forgetting to instantiate PrismaClient in PrismaService
  • Assuming findMany needs parameters
  • Thinking method must be static

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