DynamoDB query on boolean key

I'm new to DynamoDB (and to noSQL in general) and am struggling a little to get my head round some of the concepts. One thing in particular is giving me some problems, which is around querying a table based on a boolean key.

I realise that I can't created a primary or secondary index on a boolean key, but I can't see how I should ideally index and query a table with the following strcture;

reportId: string (uuid) reportText: string isActive: boolean category: string

I would like to be able to complete the following searches;

Access a specific report directly (a primary hash index of reportId) List reports of a specific category (a primary hash index on category)

These are both straightforward, but I would like to perform two other queries;

List all reports that are marked as isActive = true List all reports of a specific category that are marked as isActive = true

My first approach would be to create a primary hashkey index on 'isActive', with a rangekey on 'category', but I'm only able to choose String, Number of Boolean as the key type.

Storing isActive as a string (saved as 'true' rather than a boolean true) solves the problem, but its horrible using a string for a boolean property.

Am I missing something? Is there a simple way to query the table directly on a boolean value?

Any advice duly appreciated.

Thanks in advance.