How to apply the search in list type field in dynamodb?

Question

We are using $all in mongodb repository like below:

@Query(value = "{ 'subscriptions' : {$all : ?0 }}")

public List<ContentItem> findBySubscription(String[] subscriptionCode);

it works good for mongo but we need its alternative in dynamodb

Answer 1

The below solution uses AWS SDK DynamoDB . Currently, I think there is only community version of Spring data available for DynamoDB. So, I have provided the solution using AWS SDK .

QuerySpec Class

The CONTAINS comparison operator can be used to search for the values in LIST data type.

CONTAINS is supported for lists: When evaluating "a CONTAINS b", "a" can be a list; however, "b" cannot be a set, a map, or a list.

Example:-

QuerySpec querySpec = new QuerySpec();
querySpec.withKeyConditionExpression("yearkey = :yearval and title = :title")
                .withFilterExpression("contains (subscriptions, :subscriptions)")
                .withValueMap(
                        new ValueMap().withNumber(":yearval", yearKey)
                        .withString(":title", title) 
                        .withString(":subscriptions", subscriptions));

Edit:-

Currently, the second parameter can't be list because the API can't process it as per the specification. The workaround would be to use AND condition with multiple CONTAINS . Example below:-

.withFilterExpression("contains (subscriptions, :subscriptions1) AND contains (subscriptions, :subscriptions2)")