我正在尝试更新user
和user_profile
之间的关系。我可以更新用户,但是当我尝试更新user_profile
:
ERROR: Error: UserProfile.relationMappings.user: modelClass is not defined
据我所知,我已经模仿了文档和TypeScript示例中的示例,但有人能够理解为什么这不起作用吗?
我包含了查询,两种模型和用户配置文件迁移。 BaseModel的内容被注释掉,因此它等同于直接从Model继承,而jsonSchema
仅用于验证,所以为了简洁我删除了它们。
更新
从relationshipMappings
移除UserProfile
可以阻止错误发生,但由于我需要BelongsToOneRelation
关系,我还在尝试。至少它似乎缩小到relationMappings
上的UserProfile
。
查询
const user = await User.query() // <--- Inserts the user
.insert({ username, password });
const profile = await UserProfile.query() <--- Throws error
.insert({ user_id: 1, first_name, last_name });
模型
import { Model, RelationMappings } from 'objection';
import { BaseModel } from './base.model';
import { UserProfile } from './user-profile.model';
export class User extends BaseModel {
readonly id: number;
username: string;
password: string;
role: string;
static tableName = 'users';
static jsonSchema = { ... };
static relationMappings: RelationMappings = {
profile: {
relation: Model.HasOneRelation,
modelClass: UserProfile,
join: {
from: 'users.id',
to: 'user_profiles.user_id'
}
}
};
}
import { Model, RelationMappings } from 'objection';
import { BaseModel } from './base.model';
import { User } from './user.model';
export class UserProfile extends BaseModel {
readonly id: number;
user_id: number;
first_name: string;
last_name: string;
static tableName = 'user_profiles';
static jsonSchema = { ... };
static relationMappings: RelationMappings = {
user: {
relation: Model.BelongsToOneRelation,
modelClass: User,
join: {
from: 'user_profiles.user_id',
to: 'users.id'
}
}
};
}
移植
exports.up = function (knex, Promise) {
return knex.schema
.createTable('user_profiles', (table) => {
table.increments('id').primary();
table.integer('user_id')
.unsigned()
.notNullable();
table.foreign('user_id')
.references('users.id');
table.string('first_name');
table.string('last_name');
table.timestamps(true, true);
});
};
答案 0 :(得分:3)
我会说那个
a)是循环依赖的问题或/和 b)导入路径存在问题
一种是在modelClass中使用绝对文件路径而不是构造函数。例如
modelClass: __dirname + '/User'
或
modelClass: require('./User').default
看一下例子: https://github.com/Vincit/objection.js/blob/master/examples/express-es7/src/models/Animal.js