猫鼬模型TypeError:模式不是构造函数 [英] Mongoose model TypeError: Schema is not a constructor

问题描述

我已经看到了这个问题: mongoose TypeError:架构不是构造函数

I have seen this question: mongoose TypeError: Schema is not a constructor

但是我仍然无法将模型与Mongoose结合使用.

However I still cannot using Models with Mongoose.

当我尝试这样做时:

const mongoose = require('mongoose').connect(`mongodb://${process.env.DB_USER}:${process.env.DB_PASSWORD}@localhost:27017/${process.env.DB_NAME}`, {useNewUrlParser: true});
  const Schema = mongoose.Schema;

  var blogSchema = new Schema({
    title:  String,
    author: String,
    body:   String,
    comments: [{ body: String, date: Date }],
    date: { type: Date, default: Date.now },
    hidden: Boolean,
    meta: {
      votes: Number,
      favs:  Number
    }
  });

  var Blog = mongoose.model('Blog', blogSchema);

我收到以下错误:

TypeError: Schema is not a constructor
    at module.exports (/Users/razbuchnik/Projects/taxi4you/server/resources/permissions/api/v1-update.js:30:20)
    at Layer.handle [as handle_request] (/Users/razbuchnik/Projects/taxi4you/server/node_modules/express/lib/router/layer.js:95:5)
    at next (/Users/razbuchnik/Projects/taxi4you/server/node_modules/express/lib/router/route.js:137:13)
    at /Users/razbuchnik/Projects/taxi4you/server/app/middlewares/permission.js:27:7
    at /Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/lib/collection.js:50:5
    at runInAsyncScope (/Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/lib/cursor.js:198:5)
    at /Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/lib/cursor.js:205:5
    at handleCallback (/Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/node_modules/mongodb/lib/utils.js:120:56)
    at /Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/node_modules/mongodb/lib/cursor.js:683:5
    at handleCallback (/Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/node_modules/mongodb-core/lib/cursor.js:171:5)
    at nextFunction (/Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/node_modules/mongodb-core/lib/cursor.js:691:5)
    at /Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/node_modules/mongodb-core/lib/cursor.js:602:7
    at queryCallback (/Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/node_modules/mongodb-core/lib/cursor.js:232:18)
    at /Users/razbuchnik/Projects/taxi4you/server/node_modules/mongojs/node_modules/mongodb-core/lib/connection/pool.js:469:18
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

注意:这是来自Mongoose官方网站和GitHub存储库的复制副本.

Note: this is a copy pase from official Mongoose site and GitHub repo.

推荐答案

问题是mongoose不是Mongoose对象，而是

The problem is that mongoose is not Mongoose object but connect promise.

应该是:

const mongoose = require('mongoose')
const Schema = mongoose.Schema;

mongoose.connect(`mongodb://${process.env.DB_USER}:${process.env.DB_PASSWORD}@localhost:27017/${process.env.DB_NAME}`, {useNewUrlParser: true});

请注意，mongoose.connect可能不适用于模型，但不适用于父模块，因为可能有多个模型模块.

Notice that mongoose.connect may be suitable not for model but parent module because there could be multiple model modules.

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