private static async Task <object> FindResource(SubmitContext context, DataModificationItem item, CancellationToken cancellationToken)
{
var apiBase = context.Api;
var query = apiBase.GetQueryableSource(item.ResourceSetName);
query = item.ApplyTo(query);
var result = await apiBase.QueryAsync(new QueryRequest(query), cancellationToken).ConfigureAwait(false);
var resource = result.Results.SingleOrDefault();
if (resource == null)
{
throw new StatusCodeException(HttpStatusCode.NotFound, Resources.ResourceNotFound);
}
// This means no If-Match or If-None-Match header
if (item.OriginalValues == null || item.OriginalValues.Count == 0)
{
return(resource);
}
resource = item.ValidateEtag(result.Results.AsQueryable());
return(resource);
}
private static async Task <object> FindEntity(
SubmitContext context,
DataModificationItem entry,
CancellationToken cancellationToken)
{
IQueryable query = context.ApiContext.GetQueryableSource(entry.ResourceSetName);
query = entry.ApplyTo(query);
QueryResult result = await context.ApiContext.QueryAsync(new QueryRequest(query), cancellationToken);
object entity = result.Results.SingleOrDefault();
if (entity == null)
{
// TODO GitHubIssue#38 : Handle the case when entity is resolved
// there are 2 cases where the entity is not found:
// 1) it doesn't exist
// 2) concurrency checks have failed
// we should account for both - I can see 3 options:
// a. always return "PreConditionFailed" result
// - this is the canonical behavior of WebAPI OData, see the following post:
// "Getting started with ASP.NET Web API 2.2 for OData v4.0" on http://blogs.msdn.com/b/webdev/.
// - this makes sense because if someone deleted the record, then you still have a concurrency error
// b. possibly doing a 2nd query with just the keys to see if the record still exists
// c. only query with the keys, and then set the DbEntityEntry's OriginalValues to the ETag values,
// letting the save fail if there are concurrency errors
////throw new EntityNotFoundException
throw new InvalidOperationException(Resources.ResourceNotFound);
}
return(entity);
}
private static async Task <object> FindEntity(
SubmitContext context,
DataModificationItem item,
CancellationToken cancellationToken)
{
IQueryable query = context.ApiContext.GetQueryableSource(item.EntitySetName);
query = item.ApplyTo(query);
QueryResult result = await context.ApiContext.QueryAsync(new QueryRequest(query), cancellationToken);
object entity = result.Results.SingleOrDefault();
if (entity == null)
{
throw new ResourceNotFoundException(Resources.ResourceNotFound);
}
// This means no If-Match or If-None-Match header
if (item.OriginalValues == null || item.OriginalValues.Count == 0)
{
return(entity);
}
var etagEntity = item.ApplyEtag(result.Results.AsQueryable()).SingleOrDefault();
if (etagEntity == null)
{
// If ETAG does not match, should return 412 Precondition Failed
var message = string.Format(
CultureInfo.InvariantCulture,
Resources.PreconditionCheckFailed,
new object[] { item.DataModificationItemAction, entity });
throw new PreconditionFailedException(message);
}
return(etagEntity);
}
