AWS DynamoDB : Unmarshalliing BatchGetItem response - amazon-web-services

Question

I am using GO SDK and using the DynamnoDB BatchGetItem API.
I saw this code example -
https://github.com/aws/aws-sdk-go/blob/master/service/dynamodb/examples_test.go
Is there any other code example which shows unmarshalling of the response from the BatchGetItem API?

Answer 1

Let me share piece of the code. The key to understand it is that when you send GetBatchItem request to dynamodb, you specify map of table names and keys for that table, so response you get is a map of tables names and matched items
placeIDs := []string { "london_123", "sanfran_15", "moscow_9" }
type Place {
ID string `json:"id"`
Name string `json:"name"`
Description string `json:"description"`
}
mapOfAttrKeys := []map[string]*dynamodb.AttributeValue{}
for _, place := range placeIDs {
mapOfAttrKeys = append(mapOfAttrKeys, map[string]*dynamodb.AttributeValue{
"id": &dynamodb.AttributeValue{
S: aws.String(place),
},
"attr": &dynamodb.AttributeValue{
S: aws.String("place"),
},
})
}
input := &dynamodb.BatchGetItemInput{
RequestItems: map[string]*dynamodb.KeysAndAttributes{
tableName: &dynamodb.KeysAndAttributes{
Keys: mapOfAttrKeys,
},
},
}
batch, err := db.BatchGetItem(input)
if err != nil {
panic(fmt.Errorf("batch load of places failed, err: %w", err))
}
for _, table := range batch.Responses {
for _, item := range table {
var place Place
err = dynamodbattribute.UnmarshalMap(item, &place)
if err != nil {
panic(fmt.Errorf("failed to unmarshall place from dynamodb response, err: %w", err))
}
places = append(places, place)
}
}