node.js - sequelize belongsToMany 给出 TypeError : undefined is not a function

Question

我正在使用 sequelize 和 express，我已经这样定义了我的模型

"use strict";

var Sequelize = require('sequelize');
module.exports = function(sequelize, DataTypes) {
    var Order = sequelize.define("Order",
        {
            status: {
                type: Sequelize.INTEGER
            },
            notes: {
                type: Sequelize.STRING
            }
        },
        {
            classMethods: {
                associate: function(models) {
                    Order.belongsTo(models.User);
                    Order.belongsTo(models.Address);

                    Order.belongsToMany(models.Items);
                }
            }
        }

    );
    return Order;
}

我在尝试运行我的应用程序时收到以下错误消息

Order.belongsToMany(models.Items );
     ^
TypeError: undefined is not a function
at sequelize.define.classMethods.associate (models/order.js:18:7)
at models/index.js:24:19
at Array.forEach (native)
at Object. (models/index.js:22:17)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Module.require (module.js:365:17)
at require (module.js:384:17)

我的 index.js 文件与此处给出的示例相同:https://github.com/sequelize/express-example/blob/master/models/index.js

我的元素模型是这样的:

"use strict";

var Sequelize = require('sequelize');
module.exports = function(sequelize, DataTypes) {
  var Item = sequelize.define("Item", {
      title: {
        type: Sequelize.STRING
      },
      mrp: {
        type: Sequelize.DECIMAL,
        allowNull: false
      },
      sp: {
        type: Sequelize.DECIMAL,
        allowNull: false
      },
      desc: {
        type: Sequelize.STRING
      },
      skuId: {
        type: Sequelize.STRING,
        allowNull: false
      },
      type: {
        type: Sequelize.STRING
      },
      merchantId: {
        type: Sequelize.STRING,
        allowNull: false
      },
      categoryId: {
        type: Sequelize.STRING,
        allowNull: false
      }
    }
  );
  return Item;
}

我也试过在 app.js 中提供 belongsToMany 但它不起作用。所有其他协会都正常工作。 请帮忙。

Answer 1

您在 order.js 中有错字，您需要 Item 而不是 Items。像这样:

Order.belongsToMany(models.Item);

此外，您可能会收到一条已弃用的消息，要求您为此 belongsToMany 定义 through 参数，例如:

Order.belongsToMany(models.Item, {
    through: 'OrderItems'
});

最后，belongsToMany 是在 sequelize 2.1.0 版本中引入的，it seems .