第二级包括使用 sequelize

second level include using sequelize

如果用户可以有很多post,每个post可以有很多图片,这是否意味着用户和图片是关联的?因为目前我正在尝试向 posts 和 posts 的每个用户展示我想使用上述方法将图像显示为 url 和缩略图 url .我不断收到 Post_Image 未关联到用户的错误。

我目前正在尝试此代码,但一直收到无法读取 属性 地图的错误消息。

router.get("/posts", auth, (req, res) => {

let { id } = req.user;
User.findByPk(id, {
 include: [
  {
    model: Post,
    include: [{ model: Post_Image, attributes: ["id", "images"] }],
  },
],
}).then((post) => {
if (!post)
  return res.status(404).send();

const baseUrl = config.get("assetsBaseUrl");

const plainPost = post.get({ plain: true });
const { Post_Images, ...postAttributes } = plainPost;
const IMAGES = Post_Images.map((postImage) => ({
  url: `${baseUrl}${postImage.images}_full.jpg`,
  thumbnailUrl: `${baseUrl}${postImage.images}_thumb.jpg`,
}));

res.send({ ...postAttributes, images: IMAGES });
 });
 });

在这种情况下,它类似于在

中处理多个帖子

区别在于在哪里调用get({ plain: true }):

User.findByPk(id, {
 include: [
  {
    model: Post,
    include: [{ model: Post_Image, attributes: ["id", "images"] }],
  },
],
}).then((user) => { // we got a user here and not a post or posts
if (!user)
  return res.status(404).send();

const baseUrl = config.get("assetsBaseUrl");

const plainUser = user.get({ plain: true })
const resultPosts = []
for (const post of plainUser.Posts) {
  const { Post_Images, ...postAttributes } = post
  const IMAGES = Post_Images.map((postImage) => ({
    url: `${baseUrl}${postImage.images}_full.jpg`,
    thumbnailUrl: `${baseUrl}${postImage.images}_thumb.jpg`,
  }));
  console.log(IMAGES)
  resultPosts.push({
    ...postAttributes,
    images: IMAGES
  })
}

res.send(resultPosts);