Mysql 在两个模型上使用hasMany继续处理急负荷错误

我有两个模型（Course和Company），它们作为外键关联到日志模型中。我能够在日志模型的查询中包含/加入课程模型，而不会出现问题，但是公司模型总是抛出一个Sequelize加载错误

我曾尝试在hasMany和belongsTo协会上使用“as:companys”，但没有奏效。我也尝试过重新排序，但没有成功

// The log model

module.exports = (sequelize, DataTypes) => {
  const Log = sequelize.define("Log", {
    user: {
      type: DataTypes.STRING,
      allowNull: false
    },
    {...other values}
  })

  Log.associate = models => {
    models.Log.belongsTo(models.Company, {
      foreignKey: {
        allowNull: false
      }
    })
  }

  Log.associate = models => {
    models.Log.belongsTo(models.Course, {
      foreignKey: {
        allowNull: false
      }
    })
  }

  return Log
}


// the Course model

module.exports = (sequelize, DataTypes) => {
  const Course = sequelize.define("Course", {
    name: {
      type: DataTypes.STRING,
      allowNull: false
    },
    courseId: {
      type: DataTypes.INTEGER
    }
  })

  Course.associate = models => {
    models.Course.hasMany(models.Log)
  }

  return Course
}

// The Company model which does not work in a query:

module.exports = (sequelize, DataTypes) => {
  const Company = sequelize.define("Company", {
    name: {
      type: DataTypes.STRING,
      allowNull: false
    }
  })

  Company.associate = models => {
    models.Company.hasMany(models.Log)
  }

  return Company
}

// And finally the query, where swapping the include to be [db.Course] works, however db.Company does not:

db.Log.findAll({
  attributes: [
    "CompanyId",
  ],
  include: [db.Company]
})
.then(dbCompanies => {
  res.json(dbCompanies)
})
.catch(err => res.send(err));```

Including the course model brings in that data without any issue, but any time the company is used, it throws an error. They are identical, from what I can see.

---

您的逻辑是正确的，但语法是关闭的。加载模型时，将调用模型的“associate”方法。您想要将“Log”模型与“Company”和“Course”模型相关联，但是您要定义“associate”两次，就像JavaScript中的所有变量一样，只有最后一个定义才重要。您的原始定义（关联“日志”和“公司”模型）被覆盖，这就是您得到上述错误的原因

相反，您可以创建一个“associate”方法来创建两个关联：

Log.associate=models=>{
models.Log.belongsTo（models.Company{
外键：{
allowNull:错误
}
})
models.Log.belongsTo（models.Course{
外键：{
allowNull:错误
}
})
}

这就解决了问题-看起来很简单。Sequelize没有最用户友好的文档。谢谢