我从包含一个或多个“实体”的API收到JSON响应。 JSON看起来像这样：
{
"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
}
]
}
}
我写了以下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"`
}
然后我尝试像这样处理它（getFromOrdersAPI(page)函数返回Orders类型中上面提到的JSON：
for page := 1; page < 3; page++ {
orders := getFromOrdersAPI(page)
for _, order := range orders {
//Process all the order items except addresses
fmt.Println("Processing entity:", orders.EntityID)
for _, orderaddress := range order.Addresses {
//Trying to access address values - example below
fmt.Println(orderaddress.Region)
}
}
}
运行时，我收到错误：
orderaddress.Region undefined（类型OrderAddresses没有字段或方法Region）
我哪里错了？
答案 0 :(得分：2)
您获得的错误是由于您定义OrderAddresses结构的方式。而不是
type OrderAddresses []struct {
如果您使用
type OrderAddresses struct {
没有大括号，你的编译错误应该消失。
话虽如此，我不确定你的json是否会像我期待的那样解析我看到的blob。看来json blob中的addresses是一个数组。这意味着不要将其表示为
Addresses map[string]OrderAddresses `json:"addresses"`
您应该简单地将其分成OrderAddresses
Addresses []OrderAddresses `json:"addresses"`
答案 1 :(得分：1)
您收到orderaddress.Region undefined错误的原因是因为orderaddress循环中的for是基于OrderAddresses类型的数组。显然，数组没有名为Region的字段或方法。
如果您想查看orderaddress循环中for的内容，您可以range覆盖它：
for _, orderaddress := range order.Addresses {
for _, addressData := range orderaddress{
fmt.Printf("%+v\n", addressData)
}
}
我创建了一个示例here。
也就是说，在您的JSON数据中，addresses字段是一个数组，而不是一个映射。因此，Addresses结构中的Order字段也必须是数组。那么你的OrderAddresses应该只是一个结构，而不是结构的一部分。