即使数据存在，`User` 类型的字段也会为 Query 返回 `null`

Posted 2023-03-08

【中文标题】即使数据存在，`User` 类型的字段也会为 Query 返回 `null`

【英文标题】：Field on `User` type returns `null` for Query even though data exists

【发布时间】：2019-09-10 10:20:24

【问题描述】：

我的User 类型上有一个profilePicture 字段，即使我可以看到数据库中的数据，该字段也被返回为空。我有以下设置：

// datamodel.prisma

enum ContentType 
  IMAGE
  VIDEO


type Content @embedded 
  type: ContentType! @default(value: IMAGE)
  url: String
  publicId: String


type User 
  id: ID! @id
  name: String
  username: String! @unique
  profilePicture: Content
  website: String
  bio: String
  email: String! @unique
  phoneNumber: Int
  gender: Gender! @default(value: NOTSPECIFIED)
  following: [User!]! @relation(name: "Following", link: INLINE)
  followers: [User!]! @relation(name: "Followers", link: INLINE)
  likes: [Like!]! @relation(name: "UserLikes")
  comments: [Comment!]! @relation(name: "UserComments")
  password: String!
  resetToken: String
  resetTokenExpiry: String
  posts: [Post!]! @relation(name: "Posts")
  verified: Boolean! @default(value: false)
  permissions: [Permission!]! @default(value: USER)
  createdAt: DateTime! @createdAt
  updatedAt: DateTime! @updatedAt

// schema.graphql

type User 
  id: ID!
  name: String!
  username: String!
  profilePicture: Content
  website: String
  bio: String
  email: String!
  phoneNumber: Int
  gender: Gender!
  following: [User!]!
  followers: [User!]!
  verified: Boolean
  posts: [Post!]!
  likes: [Like!]!
  comments: [Comment!]!
  permissions: [Permission!]!

就像我说的数据库中有数据，但是当我在 Playground 中运行以下查询时，我得到 null：

// query

  user(id: "5c8e5fb424aa9a000767c6c0") 
    profilePicture 
      url
    
  

// response

  "data": 
    "user": 
      "profilePicture": null
    
  

知道为什么吗？

ctx.prisma.user(( id ), info); 不返回 profilePicture，即使 generated/prisma.graphql 中存在该字段

【参考方案1】：

修复它。我必须在User 下为profilePicture 添加一个字段解析器。我之前已经为posts 和comments 等相关字段做过此操作，我认为这是因为profilePicture 指向@embedded Content 类型，所以也是一个相关字段。

  User: 
    posts: parent => prisma.user( id: parent.id ).posts(),
    following: parent => prisma.user( id: parent.id ).following(),
    followers: parent => prisma.user( id: parent.id ).followers(),
    likes: parent => prisma.user( id: parent.id ).likes(),
    comments: parent => prisma.user( id: parent.id ).comments(),
    profilePicture: parent => prisma.user( id: parent.id ).profilePicture()