Angular 9 + NodeJS中的猫鼬模式

Question

{当我评论Like和Comment模式时，我的代码运行良好，否则由于comment和like模式而显示错误。我正在创建一个演示项目，在其中创建帖子并向其中添加“喜欢评论”按钮，以便观众可以喜欢和评论}

我拥有的post.js文件中

const mongoose = require("mongoose");

const postSchema = mongoose.Schema({
  content: { type: String, required: true },
  imagePath: { type: String, required: true },
  creator: {
    type: mongoose.Schema.Types.ObjectId,
    ref: "User",
    required: true,
  },
});

const LikeSchema = mongoose.Schema({
  likedByUser: {
    type: mongoose.Schema.Types.ObjectId,
    ref: "User",
    required: true,
  },
});

const CommentSchema = mongoose.Schema({
  comment: { type: String, required: true },
  creator: {
    type: mongoose.Schema.Types.ObjectId,
    ref: "User",
    required: true,
  },
});

module.exports = mongoose.model("Post", postSchema);
module.exports = mongoose.model("Like", LikeSchema);  
module.exports = mongoose.model("Comment", CommentSchema);

在user.js文件中，我有

const mongoose = require("mongoose");
const uniqueValidator = require("mongoose-unique-validator");

const userSchema = mongoose.Schema({
  name: { type: String, required: true },
  email: { type: String, required: true, unique: true },
  password: { type: String, required: true },
});

userSchema.plugin(uniqueValidator);

module.exports = mongoose.model("User", userSchema);