javascript - Sequelize.define 无法将可选对象合并到模型构造函数中

Question

我正在 mock 一个用express和sequelize.js构建的简单消息服务尝试使用sequelize.define("Model", Desc, Opt) 语法。但是，无法为 Model 对象加载 Opt 参数中的其他类方法。您是否有任何想法让这些对象具有使用 Opt json 指定的附加方法？ (在下面的示例中名为同事)

我使用了node v10.16.0和sequelize@5.21.3。

引用号:https://sequelize.org/master/class/lib/sequelize.js~Sequelize.html#instance-method-define

我的代码和相应的错误消息:

  const Messages = sequelize.define("Messages", {
    id: {
      type: DataType.INTEGER,
      primaryKey: true,
      autoIncrement: true
    },
    place: {
      type: DataType.STRING,
      allowNull: false,
      validate: {
        notEmpty: true
      }
    },
    message: {
      type: DataType.STRING,
      allowNull: false,
      defaultValue: false
    }
  }, {
    classMethods: {
      associate: (models) => {
        Messages.belongsTo(models.Users);
      }
    }
  });

  console.log(typeof Messages);
  console.log(Messages);
  console.log(typeof Messages.associate);
  console.log(Messages.associate);

> app1@1.0.0 start /home/neko/PJDir/app1
> node app.js

consign v0.1.6 Initialized in /home/neko/PJDir/app1
+ ./libs/config.js
+ ./db.js
+ ./models/messages.js
+ ./models/users.js
+ ./libs/middlewares.js
+ ./routes/index.js
+ ./routes/message.js
+ ./libs/boot.js
function
Messages
undefined
undefined
/home/neko/PJDir/app1/db.js:34
      db.models[key].associate(db.models);
                     ^

TypeError: db.models[key].associate is not a function
    at Object.keys.forEach.key (/home/neko/PJDir/app1/db.js:34:22)
    at Array.forEach (<anonymous>)
    at Function.module.exports.app (/home/neko/PJDir/app1/db.js:32:28)
    at Consign.into (/home/neko/PJDir/app1/node_modules/consign/lib/consign.js:240:17)
    at Object.<anonymous> (/home/neko/PJDir/app1/app.js:12:4)
    at Module._compile (internal/modules/cjs/loader.js:776:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:829:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! app1@1.0.0 start: `node app.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the app1@1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

Answer 1

尝试这样的事情

const Messages = sequelize.define('Messages', {
  id: {
    type: DataType.INTEGER,
    primaryKey: true,
    autoIncrement: true
  },
  place: {
    type: DataType.STRING,
    allowNull: false,
    validate: {
      notEmpty: true
    }
  },
  message: {
    type: DataType.STRING,
    allowNull: false,
    defaultValue: false
  }
}, {
  tableName: 'messages'
})

Messages.associate = function (models) {
  Messages.belongsTo(models.Users);
  Messages.hasMany(/* other relations */);
}