Question

遵循关于association的association.js文档，在sequelizejs 4.42.0中加入用户和消息模型（postgres）：

const { Event } = require('../models/event');
const { Message} = require('../models/message');
const { User } = require('../models/user');

module.exports = function() {
  Message.belongsTo(User, {foreignKey: "sender_id"});
  Message.belongsTo(Event, {foreignKey: "event_id"});
};

这是SQL连接代码：

require("../startup/association");

let messages = await Message.findAll({where: {event_id : req.query.event_id, fort_token: req.user.fort_token},
        attributes: {exclude: ['fort_token']}, 
        include: [{
            model: User,
            on: {
                col1: db.where(db.col("Message.fort_token"), "=", db.col("User.fort_token")),
                col2: db.where(db.col("Message.sender_id"), "=", db.col("User.id"))
            },
            attributes: ['id', 'name', 'user_data'] 
            }],
        order: ['createdAt']
      });

上面的SQL代码抛出错误：

Executing (default): SELECT "message"."id", "message"."event_id", "message"."sender_id", "message"."data", "message"."createdAt", "user"."id" AS "user.id", "user"."name" AS "user.name", "user"."user_data" AS "user.user_data" FROM "messages" AS "message" LEFT OUTER JOIN "users" AS "user" ON "Message"."fort_token"="User"."fort_token" AND "Message"."sender_id"="User"."id" WHERE "message"."event_id" = '1' AND "message"."fort_token" = '12345678901234567890' ORDER BY "message"."createdAt";
Err in retrieving messages :  missing FROM-clause entry for table "Message"

JOIN中缺少表的FROM子句条目

0 个答案: