如果它具有相同的对象，则在Golang中初始化嵌套的结构定义 [英] Initialize nested struct definition in Golang if it have same objects

问题描述

$ b

  type AutoGenerated struct {
 Accounting [ ]结构{
名字字符串`json：firstName`
 LastName字符串`json：lastName`
年龄int`json：age`
}`json： 会计
销售[]结构{
名字字符串`json：firstName`
姓氏字符串`json：lastName`
年龄int`json：年龄`
}`json：sales`
  

}

我想为它赋值如下： -

  data：= AutoGenerated {} 
 data.Accounting.LastName =Apple2
 data.Accounting.FirstName =Apple1
 data.Accounting.Age = 20 
 data .Sales.LastName =Ball2
 data.Sales.FirstName =Ball1
 data.Sales.Age = 30 
  

但是错误在于 data.Accounting.LastName未定义

虽然相同的代码工作正常

  type AutoGenerated struct {
名字字符串`json：firstName`
 LastName字符串`json：lastName`
年龄int`json：age`
} 
  

在这里我赋值如下： -

  data ：= AutoGenerated {} 
 data.LastName =Apple2
 data.FirstName =Apple1
 data.Age = 20 
  

请勿手动赋值我必须从其他函数中取值。

解决方案<在您的 data AutoGenerated 类型的对象中， data.Accounting / code>是一小块结构。在使用 data.Accounting slice之前，您需要初始化它。一个示例用法是：

  type AutoGenerated struct {
 Accounting [] Account`json：accounting`
 Sales [] struct {
 FirstName字符串`json：firstName`
 LastName字符串`json：lastName`
年龄int`json：age`
}`json：sales`
} 
 
 //单独为更好的可读性定义
类型Account结构{
名字字符串`json：firstName` 
 LastName字符串`json：lastName`
年龄int`json：age`
} 
  

然后为结构赋值：

  a：= AutoGenerated {} 
 a.Accounting = make（[] Account，1）//创建适当长度的切片
 //向它追加值
 a.Accounting = append（a.Accounting，Account {firstname ，lastname，30}）
  

I have struct like this:

type AutoGenerated struct {
 Accounting []struct {
    FirstName string `json:"firstName"`
    LastName string `json:"lastName"`
    Age int `json:"age"`
} `json:"accounting"`
Sales []struct {
    FirstName string `json:"firstName"`
    LastName string `json:"lastName"`
    Age int `json:"age"`
} `json:"sales"`

}

I want to assign values to it like this:-

data := AutoGenerated{}
data.Accounting.LastName = "Apple2"
data.Accounting.FirstName = "Apple1"
data.Accounting.Age = 20
data.Sales.LastName = "Ball2"
data.Sales.FirstName = "Ball1"
data.Sales.Age = 30

But is is giving error which is data.Accounting.LastName undefined

Although same code is working fine for

type AutoGenerated struct {
    FirstName string `json:"firstName"`
    LastName string `json:"lastName"`
    Age int `json:"age"`
}

Where I assigned the values like this:-

data := AutoGenerated{}
data.LastName = "Apple2"
data.FirstName = "Apple1"
data.Age = 20

Please don't assign values manually I have to take values from other function.

解决方案

In your object data of AutoGenerated type, data.Accounting is a slice of structs. Before you can use data.Accounting slice, you'll need to initialize it. An example usage would be:

type AutoGenerated struct {
 Accounting []Account `json:"accounting"`
 Sales []struct {
    FirstName string `json:"firstName"`
    LastName string `json:"lastName"`
    Age int `json:"age"`
 } `json:"sales"`
}

// defined separately for better readability
type Account struct {
    FirstName string `json:"firstName"`
    LastName string `json:"lastName"`
    Age int `json:"age"`
}

Then to assign values to the struct:

a := AutoGenerated{}
a.Accounting = make([]Account, 1) // create the slice of appropriate length
// append values to it
a.Accounting = append(a.Accounting, Account{"firstname", "lastname", 30})

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