FetchedResultsController and data for custom header section
I am using the fetchedResultsController with the sectionNameKeyPath as below.
let fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: self.managedObjectContext, sectionNameKeyPath: "relName.APropertyName", cacheName: nil)
the section name key is the relationship to the parent table and its one of the property name in the parent table.
I have a custom section header by overriding the below func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView?
in this header i would like to access the parent entity and its few other properties ( not just the property mentioned in the sectionNameKeyPath)
I have not enforced any uniqueness on the parent entity with the property "APropertyName" .
I would like to query the parent entity when i write the custom header for the section. How do I achieve this?
Thanks
I used the one to many relationship with the parent and child and used the "objectID" as the sectionNameKeyPath while declaring the fetchedResultsController.
Below was the deceleration of fetchedResultsController.
let fetchRequest = NSFetchRequest(entityName: "Child")
let fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: self.managedObjectContext, sectionNameKeyPath: "relParent.objectID", cacheName: nil)
Once the fetch is complete and ready to display the header information on the cell I used fetchedResultsController.sections?[section].objects property to traverse to the parent. below is the code to render the custom header cell.
override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let headerCell = tableView.dequeueReusableCellWithIdentifier("headerCell") as? ChildEntityHeaderCell
if let cell = headerCell {
if let sectionData = fetchedResultsController.sections?[section] {
if sectionData.objects != nil && sectionData.objects!.count > 0 {
if let child = sectionData.objects?[0] as? ChildEntity , parent = child.relChild // child entity has inverse relationship with the parent [ two way relationship]
{
if let name = parent.PropertyA {
cell.LabelField.text = name
}
}
}
}
}
return headerCell
}