[FunctionName("DeleteQuestion")]
public static async Task<IActionResult> RunDelete([HttpTrigger(AuthorizationLevel.Anonymous, "put", Route = null)] HttpRequest req,
                                                   ILogger log)
{
    log.LogInformation("Editing Question:");
    var content = await new StreamReader(req.Body).ReadToEndAsync();
    var documentToDeleteId = JsonConvert.DeserializeObject<string>(content);
    Uri collectionUri = UriFactory.CreateDocumentCollectionUri("QUIZDB", "QUIZContainer");
    var feedOptions = new FeedOptions { EnableCrossPartitionQuery = true };
    var docDbEndpoint = Environment.GetEnvironmentVariable("DocumentsDbEndpoint");
    var docMasterKey = Environment.GetEnvironmentVariable("DocumentsKey");
    using (var client = new DocumentClient(new Uri(docDbEndpoint), docMasterKey))
    {
        var existingDocument = client.CreateDocumentQuery<Quiz>(collectionUri, feedOptions)
 
        if (existingDocument == null)
        {
            log.LogWarning($"Questions: {documentToDeleteId} not found.");
            return new BadRequestObjectResult($"Question not found.");
         }
 
         var documentUri = UriFactory.CreateDocumentUri("QUIZDB", "QUIZContainer", documentToDeleteId);
         await client.DeleteDocumentAsync(documentUri,
                                          new RequestOptions
                                          {
                                              PartitionKey = new PartitionKey(documentToDeleteId)
                                          });
            }
 
        return new OkObjectResult(true);
}