watermelonDB 设置关系字段抛出：无法读取未定义的属性“set”

Question

我有两个表，“用户”和“俱乐部”，它们与“一对多”关系相关。这意味着每个用户可以与多个俱乐部关联，并且每个俱乐部由一个用户拥有。但是，当尝试创建新俱乐部并将其用户设置为当前用户记录时，会遇到错误：'无法读取未定义的属性'set'。'. 抛出错误的代码段：

@writer async addClub(name, location) {
    const newClub = await this.collections.get('clubs').create( club => {
      club.user.set(this) // <= this throws "Cannot read property 'set' of undefined"
      club.name = name
      club.location =location
    })
    return newClub
  } 

型号：

class User extends Model {
    static table = 'users';
    static associations = {
        clubs: { type: 'has_many', foreignKey: 'user_id' },
     }     
    @text('email') email;
    @field('password') password;
    @text('first_name') firstName;
    @text('last_name') lastName;a
    @text('username') username;
    @readonly @date('created_at') createdAt;
    @field('is_active') isActive;
    @field('is_deleted') isDeleted;
    @field('is_admin') isAdmin;
    @field('is_onboarded') isOnboarded;
    @children('clubs') clubs;

    @writer async addClub(name, location) {
      const newClub = await this.collections.get('clubs').create( club => {
        club.user.set(this)
        club.name = name
        club.location =location
      })
      return newClub
    } 
} 

class Club extends Model {
    static table = 'clubs';
    static associations = {
        users: { type: 'belongs_to', key: 'user_id' },
        groups: { type: 'has_many', foreignKey: 'club_id' },
      }
    @text('name') name;
    @text('location') location;
    @text('logo') logo;
    @readonly @date('created_at') createdAt;
    @readonly @date('updated_at') updatedAt;
    @field('is_active') isActive;
    @field('is_deleted') isDeleted;
    @relation('users', 'user_id') user;
    @children('groups') groups;
 }

该项目的依赖项列表：

"react-native": "0.72.7",
"@nozbe/watermelondb": "^0.27.1",
"@babel/plugin-proposal-decorators": "^7.23.3",
"@babel/preset-env": "^7.20.0", 

Babel.config.js

module.exports = {
  presets: ['module:metro-react-native-babel-preset'],
  plugins: [
    ["module:react-native-dotenv", 
      {
        "moduleName": "@env",
        "path": ".env",
        "blacklist": null,
        "whitelist": null,
        "safe": false,
        "allowUndefined": true
      }
    ],
    ["@babel/plugin-proposal-decorators", { "version": "legacy" }],
    'react-native-reanimated/plugin'
  ],
};

Answer 1

_setRaw

功能。我认为，在你的代码中，它看起来像这样：

@writer async addClub(name, location) {
    const newClub = await this.collections.get('clubs').create( club => {
      club._setRaw('user_id', this.id); // <= This sets the raw field
      club.name = name
      club.location =location
    })
    return newClub
} 

在查看文档以查看我是如何发现这一点时，我看到了对可用于设置字段的 record._raw 属性的引用。也许你不需要进行函数调用，只需执行

club._raw.user_id

即可，但我还没有测试过。