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循环遍历Go中的嵌套JSON元素

json go struct

循环遍历Go中的嵌套JSON元素,json,go,struct,Json,Go,Struct,我从包含一个或多个“实体”的API接收JSON响应。JSON如下所示： { "3211": { "entity_id": "3211", "status": "complete", "coupon_code": "COUPON", "shipping_description": "Shipping - AU Courier", "customer_id": "2775", "base_disc

我从包含一个或多个“实体”的API接收JSON响应。JSON如下所示：

{
    "3211": {
        "entity_id": "3211",
        "status": "complete",
        "coupon_code": "COUPON",
        "shipping_description": "Shipping - AU Courier",
        "customer_id": "2775",
        "base_discount_amount": "-50.0000",
        "base_grand_total": "149.0000",
        "base_shipping_amount": "0.0000",
        "base_shipping_tax_amount": "0.0000",
        "base_subtotal": "199.0000",
        "base_tax_amount": "0.0000",
        "base_total_paid": "149.0000",
        "base_total_refunded": null,
        "discount_amount": "-50.0000",
        "grand_total": "149.0000",
        "shipping_amount": "0.0000",
        "shipping_tax_amount": "0.0000",
        "store_to_order_rate": "1.0000",
        "subtotal": "199.0000",
        "tax_amount": "0.0000",
        "total_paid": "149.0000",
        "total_refunded": null,
        "base_shipping_discount_amount": "0.0000",
        "base_subtotal_incl_tax": "199.0000",
        "base_total_due": "0.0000",
        "shipping_discount_amount": "0.0000",
        "subtotal_incl_tax": "199.0000",
        "total_due": "0.0000",
        "increment_id": "200000423",
        "base_currency_code": "AUD",
        "discount_description": "COUPON",
        "remote_ip": "123.123.123.123",
        "store_currency_code": "AUD",
        "store_name": "Australia",
        "created_at": "2017-07-17 03:07:40",
        "shipping_incl_tax": "0.0000",
        "payment_method": "ewayrapid_ewayone",
        "gift_message_from": null,
        "gift_message_to": null,
        "gift_message_body": null,
        "tax_name": null,
        "tax_rate": null,
        "addresses": [
            {
                "region": "South Australia",
                "postcode": "5000",
                "lastname": "Doe",
                "street": "Level 6\n25 Example Street",
                "city": "Adelaide",
                "email": "example@email.com",
                "telephone": "+61 123 456 789",
                "country_id": "AU",
                "firstname": "John",
                "address_type": "billing",
                "prefix": null,
                "middlename": null,
                "suffix": null,
                "company": null
            },
            {
                "region": "South Australia",
                "postcode": "5000",
                "lastname": "Doe",
                "street": "Level 6\n25 Example Street",
                "city": "Adelaide",
                "email": "example@email.com",
                "telephone": "+61 123 456 789",
                "country_id": "AU",
                "firstname": "John",
                "address_type": "shipping",
                "prefix": null,
                "middlename": null,
                "suffix": null,
                "company": null
            }
        ]
    }
}

for _, orderaddress := range order.Addresses {
  for _, addressData := range orderaddress{
      fmt.Printf("%+v\n", addressData)
  }
}
我编写了以下
struct
类型：

type Orders map[string]Order
type Order struct {
    EntityID                   string                    `json:"entity_id"`
    Status                     string                    `json:"status"`
    CouponCode                 string                    `json:"coupon_code"`
    ShippingDescription        string                    `json:"shipping_description"`
    CustomerID                 string                    `json:"customer_id"`
    BaseDiscountAmount         string                    `json:"base_discount_amount"`
    BaseGrandTotal             string                    `json:"base_grand_total"`
    BaseShippingAmount         string                    `json:"base_shipping_amount"`
    BaseShippingTaxAmount      string                    `json:"base_shipping_tax_amount"`
    BaseSubtotal               string                    `json:"base_subtotal"`
    BaseTaxAmount              string                    `json:"base_tax_amount"`
    BaseTotalPaid              string                    `json:"base_total_paid"`
    BaseTotalRefunded          string                    `json:"base_total_refunded"`
    DiscountAmount             string                    `json:"discount_amount"`
    GrandTotal                 string                    `json:"grand_total"`
    ShippingAmount             string                    `json:"shipping_amount"`
    ShippingTaxAmount          string                    `json:"shipping_tax_amount"`
    StoreToOrderRate           string                    `json:"store_to_order_rate"`
    Subtotal                   string                    `json:"subtotal"`
    TaxAmount                  string                    `json:"tax_amount"`
    TotalPaid                  string                    `json:"total_paid"`
    TotalRefunded              string                    `json:"total_refunded"`
    BaseShippingDiscountAmount string                    `json:"base_shipping_discount_amount"`
    BaseSubtotalInclTax        string                    `json:"base_subtotal_incl_tax"`
    BaseTotalDue               string                    `json:"base_total_due"`
    ShippingDiscountAmount     string                    `json:"shipping_discount_amount"`
    SubtotalInclTax            string                    `json:"subtotal_incl_tax"`
    TotalDue                   string                    `json:"total_due"`
    IncrementID                string                    `json:"increment_id"`
    BaseCurrencyCode           string                    `json:"base_currency_code"`
    DiscountDescription        string                    `json:"discount_description"`
    RemoteIP                   string                    `json:"remote_ip"`
    StoreCurrencyCode          string                    `json:"store_currency_code"`
    StoreName                  string                    `json:"store_name"`
    CreatedAt                  string                    `json:"created_at"`
    ShippingInclTax            string                    `json:"shipping_incl_tax"`
    PaymentMethod              string                    `json:"payment_method"`
    TaxName                    string                    `json:"tax_name"`
    TaxRate                    string                    `json:"tax_rate"`
    Addresses                  map[string]OrderAddresses `json:"addresses"`
}

type OrderAddresses []struct {
    Region      string  `json:"region"`
    Postcode    string  `json:"postcode"`
    Lastname    string  `json:"lastname"`
    Street      string  `json:"street"`
    City        string  `json:"city"`
    Email       string  `json:"email"`
    Telephone   string  `json:"telephone"`
    CountryID   string  `json:"country_id"`
    Firstname   string  `json:"firstname"`
    AddressType string  `json:"address_type"`
    Prefix      *string `json:"prefix"`
    Middlename  *string `json:"middlename"`
    Suffix      *string `json:"suffix"`
    Company     *string `json:"company"`
}
然后，我尝试这样处理它（函数
getFromOrdersAPI（page）
返回上述
Orders
类型中提到的JSON）：

页面的
：=1；page<3；页面++{
订单：=getFromOrdersAPI（第页）
对于u，订单：=范围订单{
//处理除地址外的所有订单项
fmt.Println（“处理实体：”，orders.EntityID）
对于,orderaddress:=范围order.Addresses{
//尝试访问地址值-下面的示例
fmt.Println（orderaddress.Region）
}
}
}
运行此操作时，我得到错误信息：

orderaddress.Region未定义（类型OrderAddresses没有字段或方法区域）

我哪里出错了？

您得到的错误是由于您定义
OrderAddresses
结构的方式造成的。而不是

type OrderAddresses []struct {
如果你使用

type OrderAddresses struct {
如果没有大括号，编译错误就会消失

尽管如此，考虑到我所看到的blob，我不确定您的json是否会像您期望的那样进行解析。json blob中的
地址
似乎是一个数组。这意味着与其将其表示为


Addresses map[string]OrderAddresses `json:"addresses"`


您只需将其作为
OrderAddresses


Addresses []OrderAddresses `json:"addresses"`



您遇到的错误是由于您定义
OrderAddresses
结构的方式造成的。而不是


type OrderAddresses []struct {


如果你使用


type OrderAddresses struct {


如果没有大括号，编译错误就会消失

尽管如此，考虑到我所看到的blob，我不确定您的json是否会像您期望的那样进行解析。json blob中的
地址
似乎是一个数组。这意味着与其将其表示为


Addresses map[string]OrderAddresses `json:"addresses"`


您只需将其作为
OrderAddresses


Addresses []OrderAddresses `json:"addresses"`



之所以出现
orderaddress.Region undefined
错误，是因为
for
循环中的
orderaddress
是一个基于
OrderAddresses
类型的数组。显然，数组没有名为
Region
的字段或方法

如果您想检查
for
循环中的
orderaddress
是什么样子，您可以像这样对其进行
range
：


{
    "3211": {
        "entity_id": "3211",
        "status": "complete",
        "coupon_code": "COUPON",
        "shipping_description": "Shipping - AU Courier",
        "customer_id": "2775",
        "base_discount_amount": "-50.0000",
        "base_grand_total": "149.0000",
        "base_shipping_amount": "0.0000",
        "base_shipping_tax_amount": "0.0000",
        "base_subtotal": "199.0000",
        "base_tax_amount": "0.0000",
        "base_total_paid": "149.0000",
        "base_total_refunded": null,
        "discount_amount": "-50.0000",
        "grand_total": "149.0000",
        "shipping_amount": "0.0000",
        "shipping_tax_amount": "0.0000",
        "store_to_order_rate": "1.0000",
        "subtotal": "199.0000",
        "tax_amount": "0.0000",
        "total_paid": "149.0000",
        "total_refunded": null,
        "base_shipping_discount_amount": "0.0000",
        "base_subtotal_incl_tax": "199.0000",
        "base_total_due": "0.0000",
        "shipping_discount_amount": "0.0000",
        "subtotal_incl_tax": "199.0000",
        "total_due": "0.0000",
        "increment_id": "200000423",
        "base_currency_code": "AUD",
        "discount_description": "COUPON",
        "remote_ip": "123.123.123.123",
        "store_currency_code": "AUD",
        "store_name": "Australia",
        "created_at": "2017-07-17 03:07:40",
        "shipping_incl_tax": "0.0000",
        "payment_method": "ewayrapid_ewayone",
        "gift_message_from": null,
        "gift_message_to": null,
        "gift_message_body": null,
        "tax_name": null,
        "tax_rate": null,
        "addresses": [
            {
                "region": "South Australia",
                "postcode": "5000",
                "lastname": "Doe",
                "street": "Level 6\n25 Example Street",
                "city": "Adelaide",
                "email": "example@email.com",
                "telephone": "+61 123 456 789",
                "country_id": "AU",
                "firstname": "John",
                "address_type": "billing",
                "prefix": null,
                "middlename": null,
                "suffix": null,
                "company": null
            },
            {
                "region": "South Australia",
                "postcode": "5000",
                "lastname": "Doe",
                "street": "Level 6\n25 Example Street",
                "city": "Adelaide",
                "email": "example@email.com",
                "telephone": "+61 123 456 789",
                "country_id": "AU",
                "firstname": "John",
                "address_type": "shipping",
                "prefix": null,
                "middlename": null,
                "suffix": null,
                "company": null
            }
        ]
    }
}



for _, orderaddress := range order.Addresses {
  for _, addressData := range orderaddress{
      fmt.Printf("%+v\n", addressData)
  }
}


我创造了一个例子


也就是说，在JSON数据中，
addresses
字段是一个数组，而不是一个映射。因此，
Order
结构中的
Addresses
字段也必须是数组。然后，您的
orderaddress
应该只是一个结构，而不是结构的一部分。
获取
orderaddress.Region undefined
错误的原因是
for
循环中的
orderaddress
是一个数组，基于
orderaddress
类型。显然，数组没有名为
Region
的字段或方法

如果您想检查
for
循环中的
orderaddress
是什么样子，您可以像这样对其进行
range
：


{
    "3211": {
        "entity_id": "3211",
        "status": "complete",
        "coupon_code": "COUPON",
        "shipping_description": "Shipping - AU Courier",
        "customer_id": "2775",
        "base_discount_amount": "-50.0000",
        "base_grand_total": "149.0000",
        "base_shipping_amount": "0.0000",
        "base_shipping_tax_amount": "0.0000",
        "base_subtotal": "199.0000",
        "base_tax_amount": "0.0000",
        "base_total_paid": "149.0000",
        "base_total_refunded": null,
        "discount_amount": "-50.0000",
        "grand_total": "149.0000",
        "shipping_amount": "0.0000",
        "shipping_tax_amount": "0.0000",
        "store_to_order_rate": "1.0000",
        "subtotal": "199.0000",
        "tax_amount": "0.0000",
        "total_paid": "149.0000",
        "total_refunded": null,
        "base_shipping_discount_amount": "0.0000",
        "base_subtotal_incl_tax": "199.0000",
        "base_total_due": "0.0000",
        "shipping_discount_amount": "0.0000",
        "subtotal_incl_tax": "199.0000",
        "total_due": "0.0000",
        "increment_id": "200000423",
        "base_currency_code": "AUD",
        "discount_description": "COUPON",
        "remote_ip": "123.123.123.123",
        "store_currency_code": "AUD",
        "store_name": "Australia",
        "created_at": "2017-07-17 03:07:40",
        "shipping_incl_tax": "0.0000",
        "payment_method": "ewayrapid_ewayone",
        "gift_message_from": null,
        "gift_message_to": null,
        "gift_message_body": null,
        "tax_name": null,
        "tax_rate": null,
        "addresses": [
            {
                "region": "South Australia",
                "postcode": "5000",
                "lastname": "Doe",
                "street": "Level 6\n25 Example Street",
                "city": "Adelaide",
                "email": "example@email.com",
                "telephone": "+61 123 456 789",
                "country_id": "AU",
                "firstname": "John",
                "address_type": "billing",
                "prefix": null,
                "middlename": null,
                "suffix": null,
                "company": null
            },
            {
                "region": "South Australia",
                "postcode": "5000",
                "lastname": "Doe",
                "street": "Level 6\n25 Example Street",
                "city": "Adelaide",
                "email": "example@email.com",
                "telephone": "+61 123 456 789",
                "country_id": "AU",
                "firstname": "John",
                "address_type": "shipping",
                "prefix": null,
                "middlename": null,
                "suffix": null,
                "company": null
            }
        ]
    }
}



for _, orderaddress := range order.Addresses {
  for _, addressData := range orderaddress{
      fmt.Printf("%+v\n", addressData)
  }
}


我创造了一个例子


也就是说，在JSON数据中，
addresses
字段是一个数组，而不是一个映射。因此，
Order
结构中的
Addresses
字段也必须是数组。那么您的
OrderAddresses
应该只是一个结构，而不是结构的一部分。
谢谢Vikram，您的解释帮助很大。我最近从PHP转向了PHP，我仍然对它耿耿于怀。我很高兴它起到了作用！谢谢Vikram，你的解释帮了大忙。我最近从PHP转向了PHP，我仍然对它耿耿于怀。我很高兴它起到了作用！