顺序选择并包含另一个表别名

问题描述

我正在使用sequelize访问postgres数据库，我想查询一个城市，例如，包括"Building"表，但我想将输出重命名为"buildings"并返回http响应，但是我有这个错误:

I'm using sequelize to acess a postgres database and I want to query for a city and for example include the "Building" table but I want to rename the output to "buildings" and return the http response but I have this error:

    City.findById(req.params.id,{
      include: [
        {
          model: Building, as: "buildings"
        }
      ]
    }).then(city =>{
      console.log(city.id);
         res.status(201).send(city);
    }) .catch(error => {
     console.log(error);
     res.status(400).send(error)
   });

城市模型

            const models = require('../models2');
            module.exports = (sequelize, DataTypes) => {
              const City = sequelize.define('city', {
              name: { type: DataTypes.STRING, allowNull: false },
                status: { type: DataTypes.INTEGER, allowNull: false },
                latitude: { type: DataTypes.BIGINT, allowNull: false },
                longitude: { type: DataTypes.BIGINT, allowNull: false },

              }, { freezeTableName: true});
              City.associate = function(models) {
                // associations can be defined here
                 City.hasMany(models.building,{as: 'building', foreignKey: 'cityId'})
              };
              return City;
            };

推荐答案

在以下代码中定义的别名为building:

As you have defined alias name in below code is building :

City.hasMany(models.building,{as: 'building', foreignKey: 'cityId'})

但是在查询中，您正在使用buildings

But in query , you are using buildings

include: [
  {
     model: Building, as: "buildings" // <---- HERE
  }
]

---

应为building:

include: [
   {
         model: Building, as: "building" // <---- HERE
   }
]

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