Yash Srivastava Yash Srivastava - 2 months ago 22
JSON Question

How to save JSON response in dynamodb in GO

I want to save a JSON response in aws-dynamodb, I am using aws-dynamodb-sdk. What I'm currently doing is:

func (e *DB) saveToDynamodb(data map[string]interface{}){
params := &dynamodb.PutItemInput{
Item: map[string]*dynamodb.AttributeValue{
"Key": {
M: data,
},
},
TableName: aws.String("Asset_Data"),
}
resp, err := e.dynamodb.PutItem(params)

if err != nil {
fmt.Println(err.Error())
return
}
fmt.Println(resp)
}


But as you can see data is of map[string]interface{} type while the expected type is map[string]*AttributeValue that's why giving compilation error.

Is there any workaround to save a json response?

Answer

To put JSON in aws-dynamodb we first need to iterate through each attribute of JSON struct and convert it to dynamodb.AttributeValue in the following manner:

func (e *DB) saveToDynamodb(data map[string]interface{}){
var vv=make(map[string]*dynamodb.AttributeValue)

for k,v:=range data{
    x:=(v.(string)) //assert string type
    xx:=&(x)
    vv[k]=&dynamodb.AttributeValue{S: xx,}
}
//s:=data["asset_id"].(string)
params := &dynamodb.PutItemInput{
    Item: vv,
    TableName: aws.String("Asset_Data"), // Required
}
resp, err := e.dynamodb.PutItem(params)

if err != nil {
    // Print the error, cast err to awserr.Error to get the Code and
    // Message from an error.
    fmt.Println(err.Error())
    return
}

// Pretty-print the response data.
fmt.Println(resp)
}