Dynamically filter a single view/mappings from full-text search results with inter-dependent results

[king7532]

I'm using the YapDatabaseFullTextSearch extension to index and search all my user data, Contacts and Notes, see below. They are in separate collections, and only Notes has a property to reference its Contact ID. In the main user interface, I have a YapDatabase view and mappings to show all the Contacts. And I have a search controller to search all the Contacts and Notes. I want to dynamically filter only all the contacts view/mappings as the user searches, and only show the contacts for which there are search results in either Contacts or Notes. I do not want to show the Notes, only the Contact that is associated with the Note in the search results.

///// Data models
struct Contact {
    var id: String
    var name: String
}

struct Note {
    var id: String
    var contactID: String   // A contact can have many notes
    var text: String
}

Currently, in may SearchResultsViewController, I have rigged up a YapDatabaseFilteredView that is updated (by incrementing the versionTag) as the user types a search query, see performSearch below. What is the best way to dynamically filter a view/mappings? Any help or advice will be greatly appreciated. Thank you.

func performSearch(_ query: String) {
        
        filteredContacts.removeAll()   // A `Set<String>` of all the filtered contact IDs
        
        dbConnection.read { transaction in
            guard let ftsTransaction = transaction.ext("contacts_notes_fts") as? YapDatabaseFullTextSearchTransaction,
                  let filterTransaction = transaction.ext("filteredSearchContacts") as? YapDatabaseFilteredViewTransaction
            else { return }
            
            let options = YapDatabaseFullTextSearchSnippetOptions()
            ftsTransaction.enumerateKeysAndObjects(matching: query, with: options) { snippet, collection, key, object, stop in
                if let contact = object as? Contact {
                    self.filteredContacts.insert(key)
                } else if let note = object as? Note {
                    self.filteredContacts.insert(note.contactID)
                }
                os_log("filteredContacts.count: %d", self.filteredContacts.count)
            }
        }

        searchConnection.readWrite { transaction in
            guard let filterTransaction = transaction.ext("filteredSearchContacts") as? YapDatabaseFilteredViewTransaction
            else { return }
            SearchResultsViewController.FilterVersion += 1  // You need to update the versionTag or it won't run your filter closure `self.filtering`
            filterTransaction.setFiltering(self.filtering, versionTag: String(SearchResultsViewController.FilterVersion))
        }
    }