Getting ValidationException for Dynamodb in Golang-CodePudding

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

CodePudding user response：

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"`
        [...]
}