英文:
Getting ValidationException for Dynamodb in Golang
问题
我已经创建了一个类似这样的模式：
type Movie struct {Year int `json:"year"`Title string `json:"title"`Key string `json:"userId"`Email string `json:"email"`Bio string `json:"bio"`Number int `json:"phoneNumber"`SocialHandle string `json:"socialHandle"`Onboarding string `json:"username"`BankDetails string `json:"bankDetails"`Image string `json:"image"`Password string `json:"password"`Resume string `json:"resume"`Pincode string `json:"pinCode"`}
在这里，Key和Onboarding分别是我的主键和排序键。然后我添加了如下的数据：
movie := Movie{Key: "2323",Onboarding: "The Big New Movie",}
然后，我使用这个数据创建了一个普通的MarshalMap，并使用该数据获取了项目。
key, err := dynamodbattribute.MarshalMap(movie)if err != nil {fmt.Println(err.Error())return}input := &dynamodb.GetItemInput{Key: key,TableName: aws.String("tablename"),}result, err := svc.GetItem(input)if err != nil {fmt.Println(err)fmt.Println(err.Error())return}
奇怪的是，我使用相同的代码插入数据时没有问题，但在获取数据时出现错误：ValidationException: The provided key element does not match the schema。
英文:
I've made a schema like this~
type Movie struct {Year int `json:"year"`Title string `json:"title"`Key string `json:"userId"`Email string `json:"email"`Bio string `json:"bio"`Number int `json:"phoneNumber"`SocialHandle string `json:"socialHandle"`Onboarding string `json:"username"`BankDetails string `json:"bankDetails"`Image string `json:"image"`Password string `json:"password"`Resume string `json:"resume"`Pincode string `json:"pinCode"`}
Here Key and onboarding are my primary and sorting keys respectively. Then I added data like this~
movie := Movie{Key: "2323",Onboarding: "The Big New Movie",}
Then a normal MarshalMap of the thing I made, and used the data to get the item.
key, err := dynamodbattribute.MarshalMap(movie)if err != nil {fmt.Println(err.Error())return}input := &dynamodb.GetItemInput{Key: key,TableName: aws.String("tablename"),}result, err := svc.GetItem(input)if err != nil {fmt.Println(err)fmt.Println(err.Error())return}
The weird thing being I inserted data using the same code with few changes, but while fetching data it shows error ~ ValidationException: The provided key element does not match the schema
答案1
得分: 1
这个错误可能是由于在GetItem调用中发送非关键属性引起的。当你使用MarshalMap时，它会在键对象中包含所有其他属性的空值。
你可以手动构建键：
Key: map[string]*dynamodb.AttributeValue{"userId": {S: aws.String("2323"),},"username": {S: aws.String("The Big New Movie"),},},
或者在结构字段中添加omitempty，当它们没有值时，它将从编组的映射中排除这些属性：
type Movie struct {Year int `json:"year,omitempty"`Title string `json:"title,omitempty"`[...]}
英文:
This error is likely caused by sending non-key attributes in the GetItem call. When you use MarshalMap, it is including a null value for all other attributes in the key object.
Either you can construct the key manually:
Key: map[string]*dynamodb.AttributeValue{"userId": {S: aws.String("2323"),},"username": {S: aws.String("The Big New Movie"),},},
Or add omitempty to the struct fields, which will exclude these attributes from the marshalled map when they have no value:
type Movie struct {Year int `json:"year,omitempty"`Title string `json:"title,omitempty"`[...]}
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