Prisma Client Setup + Middleware for soft deletes

db.ts

import { PrismaClient } from '@prisma/client'

const dbClient = new PrismaClient({})

/*
 * Middleware to replace hard deletes with soft deletes
 * 1. deletes will update deletedAt column
 * 2. finds and updates will filter out deletedAt rows
 */
dbClient.$use(async (params, next) => {
  params.args = params.args || {}

  const addDeletedAtTimestamp = (data = {}) => ({
    ...data,
    deletedAt: new Date(),
  })

  const removeSoftDeleteFromWhere = (where = {}) => ({
    ...where,
    deletedAt: { equals: null },
  })

  switch (params.action) {
    case 'delete':
      params.action = 'update'
      params.args.data = addDeletedAtTimestamp(params.args.data)
      break
    case 'deleteMany':
      params.action = 'updateMany'
      params.args.data = addDeletedAtTimestamp(params.args.data)
      break
    case 'findUnique':
    case 'findFirst':
      params.action = 'findFirst'
      params.args.where = removeSoftDeleteFromWhere(params.args.where)
      break
    case 'findMany':
      params.args.where = removeSoftDeleteFromWhere(params.args.where)
      break
  }

  return next(params)
})

export const db = dbClient

handlePrismaLogging({ db })