- fix the long delay/spinner when selecting tables:

  > [NSTableView removeColumns] method was taking a LONG time to return - clearing the data first and then removing the columns made a big difference.
  > also, reload table view (2nd time) after allowing main thread to return. user will see a faster table selection & an empty table view - then data will populate

Author: Joe Page

CoreDataUtil/CoreData/MFLCoreDataIntrospection.m

@@ -417,7 +417,7 @@ - (NSArray*) getDataAtRow: (NSUInteger) row {
         return (self.entityData)[row];
     }
     else {
-        NSLog(@"getDataAtRow: bad row:%d", (int)row);
+        NSLog(@"getDataAtRow: bad row:%d, #rows:%d", (int)row, (int)[self entityDataCount]);
         return nil;
     }
 }
@@ -434,7 +434,6 @@ - (void)setCurrentHistoryIndex:(NSInteger)currentIndex
 
 - (void)updateCoreDataHistory:(NSString *)name predicate:(NSPredicate *)predicate objectType:(MFLObjectType)type
 {
-    NSTimeInterval startTime = [[NSDate date] timeIntervalSince1970];
     if (self.coreDataHistory == nil)
     {
         self.coreDataHistory = [[NSMutableArray alloc] initWithCapacity:CORE_DATA_HISTORY_MAX];
@@ -468,7 +467,6 @@ - (void)updateCoreDataHistory:(NSString *)name predicate:(NSPredicate *)predicat
             [self.coreDataHistory removeObjectAtIndex:currentHistoryIndex + 1];
         }
     }
-    NSLog(@"updateCoreDataHistory: %@, %@ms", name, [MFLUtils duration:startTime]);
 }
 
 @end

CoreDataUtil/MFLMainWindowController.m

@@ -250,10 +250,9 @@ - (void)onEntitySelected {
     if ([self.dataSourceList selectedRow] >= 0)
     {
         NSTimeInterval startTime = [[NSDate date] timeIntervalSince1970];
-
-        [self removeColumns];
         [self.coreDataIntrospection clearEntityData];
         [self.entityContentTable reloadData];
+        [self removeColumns];
 
         self.sortType = Unsorted;
         OutlineViewNode *selectedNode = [self.dataSourceList itemAtRow:[self.dataSourceList selectedRow]];
@@ -286,7 +285,11 @@ - (void)onEntitySelected {
                                                     predicate:[[self.coreDataIntrospection fetchRequest:selected] predicate]
                                                    objectType:MFLObjectTypeFetchRequest];
         }
-        [self.entityContentTable reloadData];
+
+        // allow main thread to return before calling reloadData again. user will see a faster table selection & an empty table view - then data will populate
+        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+            [self.entityContentTable reloadData];
+        }];
 
         [self enableDisableHistorySegmentedControls];
         NSLog(@"Selected %@, selected=%d, section:%d, %@ms", selectedNode.title, (int)selected, (int)section, [MFLUtils duration:startTime]);