create-nxtstart-app/src/templates/prisma/util/prismaClient.ts

Nxtstart is an easy to use, interactive CLI tool to bootstrap your next web-based project. The template is aimed at students to get an easy access to web development with example implementations. It is also useful for experts to speed up prototyping.

import 'dotenv/config'
// https://www.prisma.io/docs/guides/other/troubleshooting-orm/help-articles/nextjs-prisma-client-dev-practices
import { PrismaClient } from '../prisma/generated/client'
import { PrismaBetterSqlite3 } from '@prisma/adapter-better-sqlite3'

const adapter = new PrismaBetterSqlite3({
  url: process.env.DATABASE_URL as string,
})

const prismaClientSingleton = () => {
  return new PrismaClient({
    adapter,
    log: ['query', 'info', 'warn', 'error'],
   }).$extends({
    query: {
      $allOperations(params) {
        const { args, query } = params
        // prisma returns unexpected and unintuitive results for undefined filters, this prevents those results and throws an error if undefined filters are applied
        // https://github.com/prisma/prisma/issues/5149
        if (hasUndefinedValue(args.where)) {
          throw new Error(`Invalid where: ${JSON.stringify(params.args.where)}`)
        } else {
          return query(args)
        }
      },
    },
  })
}

declare const globalThis: {
  prismaGlobal: ReturnType<typeof prismaClientSingleton>
} & typeof global

export const prisma = globalThis.prismaGlobal ?? prismaClientSingleton()

if (process.env.NODE_ENV !== 'production') globalThis.prismaGlobal = prisma

function hasUndefinedValue<T>(obj: T): boolean {
  if (typeof obj !== 'object' || obj === null) return false
  for (const key in obj) {
    if (!Object.prototype.hasOwnProperty.call(obj, key)) continue
    const value = obj[key]
    if (value === undefined) return true
    if (typeof value === 'object' && !Array.isArray(value)) if (hasUndefinedValue(value)) return true
  }
  return false
}