Is there a willing soul who could kindly help me with this problem?
This is my scenario:
I need to upload form attachments to the server. So here are the steps:
Retrieve attachment headers from server using Web service.
Match the attachment header with local attachments.
Upload attachments to server.
The Problem:
Using RACSignal I can successfully obtain the attachment headers but when it's time to upload the attachments using NSArray the inner RACSignal of the UploadFormItemAttachments method will not execute.
Additional Information:
This is the code snippet that shows how the RACSignals are handled. BatchSignal is never executed!:
[[[self getFormItemAttachmentHeaders:listName
topListItemID:form.topListItemID
form:form
] map:^id(NSMutableArray* value) {
NSArray* attachmentHeaders = [value copy];
// the code of uploadFormItemAttachments is called but the inner signal does not execute. Why?
return [self uploadFormItemAttachments:pendingAttachments
attachmentHeaders:attachmentHeaders
form:form];
}
] subscribeNext:^(id value) {
// I was expecting the completion result form uploadFormItemAttachments here.
}
];
This the method that iterates over the attachments array and uploads it to the server:
- (RACSignal *)uploadFormItemAttachments:(NSArray*)pendingAttachments attachmentHeaders:(NSArray*)attachmentHeaders form:(SEFSManagedForm*)form
{
RACSignal* batchSignal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[attachmentHeaders enumerateObjectsUsingBlock:^(SEFSFormItemAttachmentHeader* attachmentHeader, NSUInteger idx, BOOL *stop)
{
// Look for the local attachment using attachment header from server
NSPredicate* predicate = [NSPredicate predicateWithFormat:@"identifier = %@", attachmentHeader.document];
NSArray* foundAttachment = [pendingAttachments filteredArrayUsingPredicate:predicate];
SEFSManagedAttachment* fullAttachment = foundAttachment[0];
RACSignal* uploadFormItemAttachmentSignal = [[self uploadFormItemAttachment:fullAttachment
attachmentHeader:attachmentHeader ] map:^id(NSNumber* value) {
NSMutableArray* valuesArray = [NSMutableArray array];
[valuesArray addObject:value];
[valuesArray addObject:attachmentHeader.document];
RACTuple* tuple = [RACTuple tupleWithObjectsFromArray:valuesArray
convertNullsToNils:YES];
return tuple;
}];
[subscriber sendNext:uploadFormItemAttachmentSignal];
}];
[subscriber sendCompleted];
return nil;
}];
return [batchSignal flatten:2];
}