用户之前是否喜欢该帖子或未使用 Sequelize [英] Has the user liked the post before or not using Sequelize

问题描述

目前，当用户喜欢某个帖子时，该喜欢的记录会与 userId 和 postId 一起添加到我的 Likes 表中.

Currently when a user likes a post, that like record gets added to my Likes table with the userId and the postId.

现在，当用户查看帖子时，我想确定他们之前是否喜欢过该帖子.我知道要这样做，我需要在我调用帖子信息时在我的 get 请求中确定这一点.

Now, when a user is looking at a post, I want to determine if they liked the post before or not. I understand that to do so, I need to determine this in my get request when i am calling for the post information.

当我调用帖子信息时，我需要检查 Likes 表以获取当前用户的 userId 和当前帖子的 postId 的记录.如果存在，那么我需要返回一个名为 isLiked 的参数并将其设置为 true，如果它不存在则 isLiked=false.

When i am calling for post information, I need to check the Likes table for a record of the userId of the current user AND the postId for the current post. If this exists then i need to return a parameter called isLiked and set it to true, if it does not exist then isLiked=false.

这是我的 Post 模型:

Here is my Post model:

id: {
  type: Sequelize.INTEGER,
  primaryKey: true,
  autoIncrement: true,
},
title: {
  type: Sequelize.STRING,

},
userId: {
  type: Sequelize.INTEGER,
},
likesCount:{
  type:Sequelize.INTEGER,
  defaultValue:0,
  validate: {
            min: 0,
        }
},

这是我的点赞模型:

id: {
allowNull: false,
autoIncrement: true,
primaryKey: true,
type: Sequelize.INTEGER,
 },
 PostId: {
type: Sequelize.INTEGER,
references: {
  model: "Post",
  key: "id",
},
 },
 userId: {
type: Sequelize.INTEGER,
references: {
  model: "User",
  key: "id",
},
 },

这是我的用户模型:

id: {
  type: Sequelize.INTEGER,
  primaryKey: true,
  autoIncrement: true,
},
name: {
  type: Sequelize.STRING,
 },

这是我的关联:

User.hasMany(Post, { foreignKey: "userId" });
Post.belongsTo(User, { foreignKey: "userId" });

Post.hasMany(Likes, { foreignKey: "PostId", targetKey: "id" });
Likes.belongsTo(Post, { foreignKey: "PostId", targetKey: "id" });

User.hasMany(Likes, { foreignKey: "userId", targetKey: "id" });
Likes.belongsTo(User, { foreignKey: "userId", targetKey: "id" });

更新

我一直在研究并发现，因为我正在使用 JWT 中间件来签署我的用户令牌，并且我目前正在检查当前用户是否在 likes 表中有任何记录，我尝试了以下操作，但有人可以告诉我这种做法正确吗?

I kept researching and found since i am using a JWT middleware to sign my user token, and i am currently checking to see if the current user has any records in the likes table, i tried the following but can someone tell me if this approach is correct?

 router.get("/", async (req, res) => {
    const posts = await Post.findAll({
   order: [["createdAt", "DESC"]],
   include: [
  { model: Post_Image, attributes: ["id", "images"] },
  { model: Likes, attributes: ["id", "PostId", "userId"] },
  ],
  });

 if (!posts) return res.status(404).send();

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

 const plainPosts = posts.map((x) => x.get({ plain: true }));
 const resultPosts = [];
  for (const post of plainPosts) {

 let isLiked = false;
 let like = await Likes.findOne({
where: {
[Op.and]: [{ PostId: post.id) }, { userId: 
req.user.id }],

  },
 });

if (like) isLiked = true;

const { Post_Images, ...postAttributes } = post;
const IMAGES = Post_Images.map((postImage) => ({
  url: `${baseUrl}${postImage.images}_full.jpg`,
  thumbnailUrl: `${baseUrl}${postImage.images}_thumb.jpg`,
}));
resultPosts.push({ ...postAttributes, images: IMAGES, isLiked 
});
}

res.send( resultPosts );

 });

推荐答案

您无需再次请求 Like，所有帖子的赞都在您手上:

You don't need to request Like once again, you got all post's likes at your hand:

for (const post of plainPosts) {
 // check if we have any like among posts' likes that is made by a certain user
 const isLiked = post.Likes.some(x => x.userId === req.user.id);
 const { Post_Images, ...postAttributes } = post;
 ...

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