如何在 TypeORM 中检索关联数据和关系数据？

Question

我有这个实体 class。它是两个表之间的关联。

import { Column, Entity, Index, JoinColumn, ManyToOne } from "typeorm";
import { Classroom } from "./Classroom";
import { Teacher } from "./Teacher";

@Index("fk_class_has_teacher_teacher1_idx", ["teacherId"], {})
@Index("fk_class_has_teacher_class1_idx", ["classId"], {})
@Entity("teacherclassroom", { schema: "school" })
export class Teacherclassroom {
  @Column("int", { primary: true, name: "class_id" })
  classId: number;

  @Column("int", { primary: true, name: "teacher_id" })
  teacherId: number;

  @Column("datetime", {
    name: "reg_date",
    nullable: true,
    default: () => "CURRENT_TIMESTAMP"
  })
  regDate: Date | null;

  @ManyToOne(
    () => Classroom,
    classroom => classroom.teacherclassrooms,
    { onDelete: "NO ACTION", onUpdate: "NO ACTION" }
  )
  @JoinColumn([{ name: "class_id", referencedColumnName: "id" }])
  class: Classroom;

  @ManyToOne(
    () => Teacher,
    teacher => teacher.teacherclassrooms,
    { onDelete: "NO ACTION", onUpdate: "NO ACTION" }
  )
  @JoinColumn([{ name: "teacher_id", referencedColumnName: "id" }])
  teacher: Teacher;
}

我想要做的是在我从此关联中检索一行时获取教师和课堂的详细信息。我是这样做的，

import "reflect-metadata";
import { createConnection, getRepository } from "typeorm";
import { Teacherclassroom } from "./entity/Teacherclassroom";
import { Classroom } from "./entity/Classroom";
import { Teacher } from "./entity/Teacher";

createConnection().then(async connection => {

    const myRepository = getRepository(Teacherclassroom);
    const test = myRepository.find({ relations: ["teacher", "classroom"] });
    console.log(test);

}).catch(error => console.log(error));

我遇到了这个错误，

Relation was not found, please check if it is correct and really exist in your entity.

Answer 1

只需在课堂关系

中将 class 更改为 classroom

@ManyToOne(() => Classroom,classroom => classroom.teacherclassrooms,
{ onDelete: "NO ACTION", onUpdate: "NO ACTION" })
@JoinColumn([{ name: "class_id", referencedColumnName: "id" }])
classroom: Classroom;

如何在 TypeORM 中检索关联数据和关系数据？

How do I retrieve association data along with relational data in TypeORM?

javascript

mysql

relational-database

typescript

typeorm