Mongoose 模型架构和 Node 需要顺序

Question

我在理解如何构建我的 Mongoose 模型文件时遇到了问题，因此当我需要依赖项时我不会遇到依赖项问题。我有很多模型文件，当我需要另一个模型文件中的一个模型文件用作参考类型时，如果我不需要按顺序排列模型文件，我会遇到错误。如果我不能以线性顺序加载它们，因为依赖关系在模型文件列表中上下移动，我应该在架构上做些什么不同的事情？我是否只需要把他们弄得一团糟，希望我不会把自己画到角落里，还是我做错了？

app.js - 我的应用的顶部

const path = require('path');
const bodyParser = require("body-parser");
const mongoose = require('mongoose');

const express = require('express');

require('./models/task');
require('./models/taskstory');
require('./models/majortask');
require('./models/majortaskinstance');
require('./models/client');
require('./models/discipline');
require('./models/disciplineinstance');
require('./models/estimate');
require('./models/project');
require('./models/user');

const taskstoryRoutes = require('./routes/taskstory');
const majortaskRoutes = require('./routes/majortask');
const taskRoutes = require('./routes/task');
const userRoutes = require("./routes/user");
const clientRoutes = require("./routes/client");
const projectRoutes = require("./routes/project");
const estimateRoutes = require('./routes/estimate');
const disciplineRoutes = require('./routes/discipline');

const app = express();

还有一个示例模型... 估计.js

const mongoose = require('mongoose');
const disciplineinstanceschema = require('mongoose').model('disciplineInstance').schema;
var ObjectId = require('mongoose').Types.ObjectId;


const estimateScheme = mongoose.Schema({
  estimatename: { type: String, required: true, unique: true },
  summarytext: { type: String },
  scopetext: { type: String },
  disciplines:{type: [disciplineinstanceschema], sparse:true}
});

module.exports = mongoose.model('Estimate', estimateScheme);

Answer 1

最好在路由文件中导入模型，并在其文件中导入每个模型依赖项，如下所示：

// models/disciplineInstance.js
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const disciplineInstanceSchema = new Schema({
  // some things
});
module.exports.disciplineInstanceSchema = disciplineInstanceSchema;  // schema
module.exports.DisciplineInstance = mongoose.model('DisciplineInstance', disciplineInstanceSchema); // model

// models/estimate.js
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const {DisciplineInstanceSchema} = require('models/disciplineInstance.js');

const estimateScheme = new Schema({
  estimatename: { type: String, required: true, unique: true },
  summarytext: { type: String },
  scopetext: { type: String },
  disciplinesByRef:{   // by reference model design
  type: Schema.Types.ObjectId,
  ref: 'DisciplineInstance'  // this is a collection/model name
  }, 
  disciplinesEmbedded: {  // embedded model design
  type: DisciplineInstanceSchema
  }
});

module.exports = mongoose.model('Estimate', estimateScheme);

• 有关 embedded design 与 reference design 的更多信息，请参阅 mongodb documents。