aws-sdk-go-v2的attributevalue.Marshaler接口不起作用。

huangapple
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英文:

aws-sdk-go-v2 attributevalue.Marshaler interface not working

问题

我尝试实现aws-sdk-go-v2的attributevalue.Marshaler接口，但没有效果。始终在数据库中存储一个空对象。

我有以下结构体：

  1. type ID struct {
  2. 	value string
  3. }

我尝试了两个版本的marshaler：

  1. func (id *ID) MarshalDynamoDBAttributeValue() (types.AttributeValue, error) {
  2. 	return &types.AttributeValueMemberM{
  3. 		Value: map[string]types.AttributeValue{
  4. 			"value": &types.AttributeValueMemberS{Value: id.value},
  5. 		},
  6. 	}, nil
  7. }

和

  1. func (id *ID) MarshalDynamoDBAttributeValue() (types.AttributeValue, error) {
  2.     return &types.AttributeValueMemberS{Value: id.value}, nil
  3. }

在这两种情况下，我可以通过调试器看到它进入了函数，并且返回的值看起来是正确的。但是在检查数据库后，id被存储为一个没有属性的对象。

英文:

I try to implement the aws-sdk-go-v2 attributevalue.Marshaler interface but it has no effect. An empty object is always stored on the db.

I have the following struct

  1. type ID struct {
  2. 	value string
  3. }

it tried both versions of the marshaler

  1. func (id *ID) MarshalDynamoDBAttributeValue() (types.AttributeValue, error) {
  2. 	return &types.AttributeValueMemberM{
  3. 		Value: map[string]types.AttributeValue{
  4. 			"value": &types.AttributeValueMemberS{Value: id.value},
  5. 		},
  6. 	}, nil
  7. }

and

  1. func (id *ID) MarshalDynamoDBAttributeValue() (types.AttributeValue, error) {
  2.     return &types.AttributeValueMemberS{Value: id.value}, nil
  3. }

in both cases I can see with the debugger that it enters on the function and looks likes the returned value is correct. But after that when I check on the db the id is stored as an object without properties.

答案1

得分: 1

问题是 ID 上的链接无法工作：

这个不会工作：

  1. func (id *ID) MarshalDynamoDBAttributeValue() (types.AttributeValue, error) {
  2. 	return &types.AttributeValueMemberS{Value: id.value}, nil
  3. }

但是去掉链接的相同代码可以工作：

  1. func (id ID) MarshalDynamoDBAttributeValue() (types.AttributeValue, error) {
  2. 	return &types.AttributeValueMemberS{Value: id.value}, nil
  3. }
英文:

The problem is the link on the ID

that will not work:

  1. func (id *ID) MarshalDynamoDBAttributeValue() (types.AttributeValue, error) {
  2.     return &types.AttributeValueMemberS{Value: id.value}, nil
  3. }

but the same thing without link works

  1. func (id ID) MarshalDynamoDBAttributeValue() (types.AttributeValue, error) {
  2. 	return &types.AttributeValueMemberS{Value: id.value}, nil
  3. }

huangapple
  • 本文由 发表于 2023年4月13日 18:40:37
  • 转载请务必保留本文链接：https://go.coder-hub.com/76004479.html
  • amazon-dynamodb
  • go
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