GoLang 如何使用 GORM 加载嵌套对象

Question

Hi let's say that I have 3 Structs in the following format

type Employee struct {
  Id int
  Name string
  CompanyId int `gorm:"column:companyId"`
  Company Company `gorm:"foreignKey:CompanyId"`
}

type Company struct {
  Id int
  CompanyName string
  OwnerId `gorm:"column:owner"`
  Owner Owner `gorm:"foreignKey:OwnerId"`
}

type Owner struct {
  Id int
  Name string
  Age int
  Email string
}

func (E Employee) GetAllEmployees() ([]Employee, error) {
  Employees := []Employee
  db.Preload("Company").Find(&Employees)
}

// -- -- There response will be like

[
  {
    id: 1
    name: "codernadir"
    company: {
      id: 5
      company_name: "Company"
      owner: {
        id 0
        Name ""
        Age 0
        Email ""
      }
    }
  }
]

here I'm getting Owner values with the default values. the given examples are for describing what I'm trying to reach.

I need a way how to load the Owner struct with its values when I load the Employees?

any suggestions will be appreciated and thanks in advance

Answer 1

You can use the gorm:"embedded" tag:

type Employee struct {
  Id int
  Name string
  CompanyId int `gorm:"column:companyId"`
  Company Company `gorm:"embedded"`
}

type Company struct {
  Id int
  CompanyName string
  OwnerId `gorm:"column:owner"`
  Owner Owner `gorm:"embedded"`
}

type Owner struct {
  Id int
  Name string
  Age int
  Email string
}

Answer 2

这是我发现的从嵌入式结构加载嵌套对象的解决方案

db.Preload("Company").Preload("Company.Owner").Find(&Employees)