如何通过typeORM字段编写具有空@ManyToOne关系的实体

编程问答 2022-08-16

问题描述

我有两个@Entity，一个是：

@Entity()
export class Person {
    @PrimaryGeneratedColumn()
    id!: number;

    @OnetoOne(type => User)
    @JoinColumn()
    user!: User;


    @ManyToOne(type => Organization,org => org.people)
    belong_organization!: Organization;

    @Column("simple-array")
    expertise?: string[];


}

另一个是组织：

@Entity()
export class Organization {
    @PrimaryGeneratedColumn()
    id!: number;

    @Column('varchar')
    name!: string;

    @Column('text')
    brief?: string;

    @Column({
        type: "enum",enum: ["admin","active","deactive"],default: 'active'
    })
    status!: string;

    @Column('varchar')
    website!: string;

    @Column('simple-array')
    mailext!: string[];

    @ManyToOne(type => Person,p => p.belong_organization)
    people?: Person[];

一个组织可以有很多人，也可以是空的。 当我尝试通过诸如（next.js）之类的发帖请求来构建组织时：

const handler = nextConnect();
handler.post(async (req: NextApiRequest,res: NextApiResponse)=>{
    const {name,brief,status,website,mailext,member} = req.body
    console.log(req.body)
    const org = new Organization();
    org.name = name
    org.brief = brief
    org.status = status
    org.website = website
    org.mailext = mailext
    org.people = undefined
    console.log("--------");
    try{
        const result= await dbManager.save(org) //<= Error happens here
    console.log("====================");
    console.log(result)
    res.status(200).json(org)
    }catch(e){
        console.log("Error:",e)
    }
})

即使我只是像[]一样将人定义为未定义或为空，仍然存在以下错误：

ReferenceError: Cannot access 'Person' before initialization
    at Module.Person (/mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:315:98)
    at Module../db/entity/Contact.ts (/mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:137:1152)
    at __webpack_require__ (/mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:23:31)
    at Module../db/entity/Person.ts (/mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:319:66)
    at __webpack_require__ (/mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:23:31)
    at Module../db/entity/Organization.ts (/mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:226:65)
    at __webpack_require__ (/mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:23:31)
    at Module../pages/apI/Organization/create.ts (/mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:576:81)
    at __webpack_require__ (/mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:23:31)
    at /mnt/c/workgit/projeny/.next/server/pages/apI/Organization/create.js:91:18

如何创建没有实体的空数组？

解决方法

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one-to-manyormtypeormtypescripttypescript