保存一对一的关系

现在来创建一个 photo，它的元信息将它们互相连接起来。

import { createConnection } from "typeorm";
import { Photo } from "./entity/Photo";
import { PhotoMetadata } from "./entity/PhotoMetadata";
createConnection(/*...*/)
  .then(async connection => {
    // 创建 photo
    let photo = new Photo();
    photo.name = "Me and Bears";
    photo.description = "I am near polar bears";
    photo.filename = "photo-with-bears.jpg";
    photo.isPublished = true;
    // 创建 photo metadata
    let metadata = new PhotoMetadata();
    metadata.height = 640;
    metadata.width = 480;
    metadata.compressed = true;
    metadata.comment = "cybershoot";
    metadata.orientation = "portait";
    metadata.photo = photo; // 联接两者
    // 获取实体 repositories
    let photoRepository = connection.getRepository(Photo);
    let metadataRepository = connection.getRepository(PhotoMetadata);
    // 先保存photo
    await photoRepository.save(photo);
    // 然后保存photo的metadata
    await metadataRepository.save(metadata);
    // 完成
    console.log("Metadata is saved, and relation between metadata and photo is created in the database too");
  })
  .catch(error => console.log(error));