Batch insertion of spreadsheet cells using gdata-objectivec-client not working

Question

I am trying to add a batch of cells to a Google Spreadsheet using the GData Objective-C Client as described here: http://code.google.com/p/gdata-objectivec-client/wiki/GDataObjCIntroduction#Batch_requests.

Here is the code of interest:

                      GDataFeedSpreadsheetCell *batchFeed = [GDataFeedSpreadsheetCell spreadsheetCellFeed];
                  NSURL *batchUrl = [[batchFeed batchLink] URL];

                  NSMutableArray *cells = [NSMutableArray array];

                  GDataSpreadsheetCell *cell = [GDataSpreadsheetCell cellWithRow:1 column:1 inputString:@"test" numericValue:nil resultString:nil];

                  GDataEntrySpreadsheetCell *cellEntry = [GDataEntrySpreadsheetCell spreadsheetCellEntryWithCell:cell];
                  [cells addObject:cellEntry];                      
                  [batchFeed setEntries:cells];

                  GDataBatchOperation *op;
                  op = [GDataBatchOperation batchOperationWithType:kGDataBatchOperationInsert];
                  [batchFeed setBatchOperation:op];

                  [service fetchFeedWithBatchFeed:batchFeed forBatchFeedURL:batchUrl completionHandler:nil];

It doesn't work. Clearly, the fetchFeedWithBatchFeed has no reference to my GDataWorksheetEntry object -- so it doesn't surprise me that it isn't working.

What am I leaving out?

Thanks in advance.

Answer 1

And here is the final answer.

You must perform a query before the batch update to get the entries you are going to update. Sounds obvious in retrospect. Sure does make for a lot of nested blocks though.

                     NSURL *cellsFeedUrl = [[worksheetEntry cellsLink] URL];

                  GDataQuerySpreadsheet *querySpreadsheet = [GDataQuerySpreadsheet spreadsheetQueryWithFeedURL:cellsFeedUrl];
                  [querySpreadsheet setMinimumRow:1];
                  [querySpreadsheet setMaximumRow:1];
                  [querySpreadsheet setMinimumColumn:1];
                  [querySpreadsheet setMaximumColumn:7];
                  [querySpreadsheet setShouldReturnEmpty:TRUE];

                  [service fetchFeedWithQuery:querySpreadsheet completionHandler:
                   ^(GDataServiceTicket *ticket, GDataFeedBase *feed, NSError *error) {

                       // Update one of these cells as a test.
                       GDataEntrySpreadsheetCell *spreadsheetCellEntry = [[feed entries] lastObject];
                       [[spreadsheetCellEntry cell] setInputString:@"test"];

                       NSArray *updatedEntries = [feed entries];
                       NSString *eTag = feed.ETag;

                       // Get worksheet cells feed
                       [service fetchFeedWithURL:cellsFeedUrl completionHandler:
                        ^(GDataServiceTicket *ticket, GDataFeedBase *feed, NSError *error) {

                            NSURL *batchUrl = [[feed batchLink] URL];
                            GDataFeedSpreadsheetCell *batchFeed = [GDataFeedSpreadsheetCell spreadsheetCellFeed];

                            [batchFeed setEntriesWithEntries:updatedEntries];

                            GDataBatchOperation *op;
                            op = [GDataBatchOperation batchOperationWithType:kGDataBatchOperationUpdate];
                            [batchFeed setBatchOperation:op];
                            [batchFeed setETag:eTag];

                            // Perform batch update
                            [service fetchFeedWithBatchFeed:batchFeed forBatchFeedURL:batchUrl
                                          completionHandler:
                             ^(GDataServiceTicket *ticket, GDataFeedBase *feed, NSError *error) {

                                 // no op

                             }];
                        }];
                   }];