1

我想知道如何使用 Prisma2 和 Jest 删除表中的所有项目？

我阅读了CRUD 文档并尝试使用：

user.test.js

....
import { PrismaClient } from "@prisma/client"

beforeEach(async () => {
    const prisma = new PrismaClient()
    await prisma.user.deleteMany({})
})
...

但我有一个错误：

Invalid `prisma.user.deleteMany()` invocation:
The change you are trying to make would violate the required relation 'PostToUser' between the `Post` and `User` models.

我的数据库

CREATE TABLE User (
  id INTEGER PRIMARY KEY AUTO_INCREMENT NOT NULL,
  name VARCHAR(255),
  email VARCHAR(255) UNIQUE NOT NULL,
  password VARCHAR(255) NOT NULL
);

CREATE TABLE Post (
  id INTEGER PRIMARY KEY AUTO_INCREMENT NOT NULL,
  title VARCHAR(255) NOT NULL,
  createdAt TIMESTAMP NOT NULL DEFAULT now(),
  content TEXT,
  published BOOLEAN NOT NULL DEFAULT false,
  fk_user_id INTEGER NOT NULL,
  CONSTRAINT `fk_user_id` FOREIGN KEY (fk_user_id) REFERENCES User(id) ON DELETE CASCADE
);

模式棱镜

model Post {
  content    String?
  createdAt  DateTime @default(now())
  fk_user_id Int
  id         Int      @default(autoincrement()) @id
  published  Boolean  @default(false)
  title      String
  author     User     @relation(fields: [fk_user_id], references: [id])

  @@index([fk_user_id], name: "fk_user_id")
}

model User {
  email    String   @unique
  id       Int      @default(autoincrement()) @id
  name     String?
  password String   @default("")
  Post     Post[]
  Profile  Profile?
}
4

2 回答 2

1

您违反了Post和之间的外键约束User。在删除它之前你不能User删除它Posts

beforeEach(async () => {
    const prisma = new PrismaClient()
    await prisma.post.deleteMany({where: {...}}) //delete posts first
    await prisma.user.deleteMany({})
})

或者在外键上设置 CASCADE 删除，这样当你删除一个用户时，它的帖子会被自动删除

于 2020-06-19T12:14:42.480 回答
0

这是另一种方法，这将删除所有行及其相关行，也会重置 ID。通过这种方式，您可以遍历所有表并且顺序无关紧要。

prisma.$executeRaw(`TRUNCATE TABLE ${table} RESTART IDENTITY CASCADE;`)
于 2021-04-28T23:18:08.073 回答