Question

我在sqlite文件中有两个简单的表： assets：{id，symbol，name} - 所有文本字段评级：{symbol，rating} - 所有文本字段

我正在尝试获取{id，symbol，name，rating}的查询，但我必须遗漏一些内容，因为评分总是以null的形式返回。

我尝试的事情：

添加2个关联（hasOne和belongsTo）
将references添加到评级模型中的外键
将targetKey字段名称添加到关联

这是我的代码：模式，模型，关联和查询：

import Sequelize from 'sequelize';

const sequelize = new Sequelize('sqlite:./stocks.sqlite3', {
  operatorsAliases: false,
  logging: false
});

const stocksSchema = {
  id: {type: Sequelize.STRING, primaryKey: true, allowNull: false},
  name: {type: Sequelize.STRING, allowNull: false},
  symbol: {type: Sequelize.STRING, allowNull: false}
};

const stocksModel = sequelize.define('stock', stocksSchema, {
  tableName: 'stocks',
  timestamps: false
});

const ratingsSchema = {
  symbol: {type: Sequelize.STRING, primaryKey: true, allowNull: false, references: {model: stocksModel, key: 'symbol'}},
  rating: {type: Sequelize.STRING(2), allowNull: false}
};

const ratingsModel = sequelize.define('rating', ratingsSchema, {
  tableName: 'ratings',
  timestamps: false
});

//association
stocksModel.hasOne(ratingsModel, {foreignKey: 'symbol'});

//query
const getById = async (id) => {
    try {
      return await stocksModel.findOne({
        where: {id: id},
        include:[{model: ratingsModel}]})
      .then(result => result ? result.dataValues : Promise.reject('not found'));
    }
    catch(e) {
      console.error(e);
      throw e;
    }
  }

有人可以指出我缺少的东西吗？

更新
每个请求，打开日志记录，得到以下SQL：

Executing (default): SELECT `stocks`.`id`, `stocks`.`name`, `stocks`.`symbol`, `rating`.`symbol` AS `rating.symbol`, `rating`.`rating` AS `rating.rating` FROM `stocks` AS `stocks` LEFT OUTER JOIN `ratings` AS `rating` ON `stocks`.`id` = `rating`.`symbol` WHERE `stocks`.`id` = 'XYZ';

结果：

dataValues: {
  id: 'XYZ',
  name: 'XYZStock',
  symbol: 'xyz',
  rating: null
}

两个表中都存在symbol = 'xyz'行。

Answer 1

我认为问题在于关联，

也添加此行：

ratingsModel.belongsTo(stocksModel, {foreignKey: 'symbol' , targetKey : 'symbol' });

无法在Sequelize中加入表格

1 个答案: