如何为 Protobuf 消息中的重复 oneof 字段分配值？

huangapple
go评论106阅读模式
英文:

How do I assign value to a repeated oneof field in a protobuf message?

问题

我有一个名为CoverageReport的protobuf消息，结构如下：

  1. message Deductible {
  2.   double amount = 1;
  3.   string currency = 2;
  4. }
  6. message Insurance {
  7.   string type = 1;
  8.   string policyNumber = 2;
  9.   string agreementName = 3;
  10.   string appliedTo = 4;
  11.   string validFrom = 5;
  12.   string validTo = 6;
  13.   Deductible deductible = 7;
  14. }
  16. message Warranty {
  17.   string type = 1;
  18.   string warrantyType = 2;
  19.   string agreementName = 3;
  20.   string appliedTo = 4;
  21.   string validFrom = 5;
  22.   string validTo = 6;
  23. }
  25. message Coverage {
  26.   oneof item {
  27.     Insurance insurance = 1;
  28.     Warranty warranty = 2;
  29.   }
  30. }
  32. message CoverageReport {
  33.   bool coverageAppliance = 1;
  34.   repeated Coverage coverages = 2;
  35. }

在我的程序中，我试图给一个消息实例赋值，但我不确定如何给oneof字段Coverage赋值，然后将其附加到Coverages中，就像这样：

我从一个API中获取响应，将其解组成与protobuf类似结构的CoverageReport结构体。然后，我需要使用结构体中的值创建一个protobuf消息。但是似乎无法给oneof字段赋值！

  1. type CoverageReport struct {
  2. 	CoverageAppliance string `json:"coverageAppliance"`
  3. 	Coverages         []struct {
  4. 		Type          string `json:"type"`
  5. 		PolicyNumber  string `json:"policyNumber,omitempty"`
  6. 		AgreementName string `json:"agreementName"`
  7. 		AppliedTo     string `json:"appliedTo"`
  8. 		ValidFrom     string `json:"validFrom"`
  9. 		ValidTo       string `json:"validTo"`
  10. 		Deductible    struct {
  11. 			Amount   float64 `json:"amount"`
  12. 			Currency string  `json:"currency"`
  13. 		} `json:"deductible,omitempty"`
  14. 		WarrantyType string `json:"warrantyType,omitempty"`
  15. 	} `json:"coverages"`
  16. }
  18. var coveragereport *CoverageReport
  20. err = json.Unmarshal(body, &coveragereport)
  22. var cr *vcsproto.CoverageReport
  24. if coveragereport.CoverageAppliance == "Yes" {
  25. 	cr.CoverageAppliance = true
  26. }
  28. for _, item := range coveragereport.Coverages {
  29. 	if item.Type == "Warranty" {
  30. 		var warranty *vcsproto.Warranty
  31. 		warranty.Type = item.Type
  32. 		warranty.WarrantyType = item.WarrantyType
  33. 		warranty.AgreementName = item.AgreementName
  34. 		warranty.AppliedTo = item.AppliedTo
  35. 		warranty.ValidFrom = item.ValidFrom
  36. 		warranty.ValidTo = item.ValidTo
  38. 		var coverage *vcsproto.Coverage
  39. 		coverage.Item.Warranty = warranty
  41. 		cr.Coverages = append(cr.Coverages, coverage)
  42. 	} else {
  43. 		var insurance *vcsproto.Insurance
  44. 		insurance.Type = item.Type
  45. 		insurance.PolicyNumber = item.PolicyNumber
  46. 		insurance.AgreementName = item.AgreementName
  47. 		insurance.AppliedTo = item.AppliedTo
  48. 		insurance.ValidFrom = item.ValidFrom
  49. 		insurance.ValidTo = item.ValidTo
  50. 		insurance.Deductible.Currency = item.Deductible.Currency
  51. 		insurance.Deductible.Amount = item.Deductible.Amount
  53. 		var coverage *vcsproto.Coverage
  54. 		coverage.Item.Insurance = insurance
  56. 		cr.Coverages = append(cr.Coverages, coverage)
  57. 	}
  58. }

以上是你提供的代码的翻译。

英文:

I have a protobuf message CoverageReport like this:

  1.  message Deductible {
  2. double amount = 1;
  3. string currency = 2;
  4. }
  5. message Insurance{
  6. string type = 1;
  7. string policyNumber = 2;
  8. string agreementName = 3;
  9. string appliedTo = 4;
  10. string validFrom = 5;
  11. string validTo = 6;
  12. Deductible deductible = 7;
  13. }
  14. message Warranty {
  15. string type = 1;
  16. string warrantyType = 2;
  17. string agreementName = 3;
  18. string appliedTo = 4;
  19. string validFrom = 5;
  20. string validTo = 6;
  21. }
  22. message Coverage {
  23. oneof item {
  24. Insurance insurance = 1;
  25. Warranty warranty = 2;
  26. }
  27. }
  28. message CoverageReport {
  29. bool coverageAppliance = 1;
  30. repeated Coverage coverages = 2;
  31. }

In my program I'm trying to assign values to a message instance, but I'm not sure how to assign to the oneof field Coverage which should then be appended to Coverages, like this
I get a response from an api, which i unmarshal into the struct CoverageReport which has similar structure to the protobuf. Then i need to create a protobuf message using the values from the struct. But it doesn't seem to work to asssign to the one of field!

  1. type CoverageReport struct {
  2. CoverageAppliance string `json:"coverageAppliance"`
  3. Coverages         []struct {
  4. Type          string `json:"type"`
  5. PolicyNumber  string `json:"policyNumber,omitempty"`
  6. AgreementName string `json:"agreementName"`
  7. AppliedTo     string `json:"appliedTo"`
  8. ValidFrom     string `json:"validFrom"`
  9. ValidTo       string `json:"validTo"`
  10. Deductible    struct {
  11. Amount   float64 `json:"amount"`
  12. Currency string  `json:"currency"`
  13. } `json:"deductible,omitempty"`
  14. WarrantyType string `json:"warrantyType,omitempty"`
  15. } `json:"coverages"`
  16. }
  17. var coveragereport *CoverageReport
  18. err = json.Unmarshal(body, &coveragereport)
  19. var cr *vcsproto.CoverageReport
  20. if coveragereport.CoverageAppliance == "Yes" {
  21. cr.CoverageAppliance = true
  22. }
  23. for _, item := range coveragereport.Coverages {
  24. if item.Type == "Warranty"{
  25. var warranty *vcsproto.Warranty 
  26. warranty.Type = item.Type
  27. warranty.WarrantyType = item.WarrantyType
  28. warranty.AgreementName = item.AgreementName
  29. warranty.AppliedTo = item.AppliedTo
  30. warranty.ValidFrom = item.ValidFrom
  31. warranty.ValidTo = item.ValidTo
  32. var coverage *vcsproto.Coverage
  33. coverage.Item.Warranty = warranty
  34. cr.Coverages = append(cr.Coverages, coverage)
  35. } else {
  36. var insurance *vcsproto.Insurance
  37. insurance.Type = item.Type
  38. insurance.PolicyNumber = item.PolicyNumber
  39. insurance.AgreementName = item.AgreementName
  40. insurance.AppliedTo = item.AppliedTo
  41. insurance.ValidFrom = item.ValidFrom
  42. insurance.ValidTo = item.ValidTo. 
  43. insurance.Deductible.Currency = item.Deductible.Currency 
  44. insurance.Deductible.Amount = item.Deductible.Amount 
  45. var coverage *vcsproto.Coverage
  46. coverage.Item.Insurance = Insurance
  47. cr.Coverages = append(cr.Coverages, coverage)
  48. }
  49. }

答案1

得分: 1

请看这里生成的代码这里。

你不直接给Warranty或Insurance子字段赋值，而是直接给Item字段赋值。所以coverage.Item = {insurance/warranty}应该可以工作。

还要注意，在你的代码中，你赋值了coverage.Item.Insurance = Insurance - 你可能想要将第二个Insurance改为变量insurance。

英文:

Take a look in the generated code here.

You do not assign directly to the Warranty nor Insurance subfields, but directly to the Item field. so coverage.Item = {insurance/warranty} should work.

Also note that in your code you're assigning coverage.Item.Insurance = Insurance - you probably meant the second Insurance to be the variable insurance instead.

huangapple
  • 本文由 发表于 2021年10月5日 19:41:46
  • 转载请务必保留本文链接：https://go.coder-hub.com/69449795.html
  • go
  • protocol-buffers
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