Cannot convert return expression of type 'FetchedResults<>' to return type '[St-CodePudding

I'm trying to search through a list of bookmarks by name stored in Core Data but I'm getting this error next to 'return items' in var searchResults

"Cannot convert return expression of type 'FetchedResults <MyBookmark to return type '[String]'"

 @FetchRequest(sortDescriptors: [NSSortDescriptor(keyPath: \MyBookmark.name, ascending: true)], animation: .default)
 private var items: FetchedResults<MyBookmark>
 @State private var searchText = ""

         ForEach(searchResults, id: \.self) { myBookmark in                        
                    Text(myBookmark.name!)
                    Text(myBookmark.url!)
                   }
                   .searchable(text: $searchText)




         var searchResults: [String] {
            if searchText.isEmpty {
               return items
          } else {
              return items.filter { $0.localizedCaseInsensitiveContains(searchText) }
            }
         }

MyBookmark

@objc(MyBookmark)
public class MyBookmark: NSManagedObject, BaseModel {
    static var all: NSFetchRequest<MyBookmark> {
        let request: NSFetchRequest<MyBookmark> = MyBookmark.fetchRequest()
        request.sortDescriptors = []
        return request
    }
    
}


extension MyBookmark {

    @nonobjc public class func fetchRequest() -> NSFetchRequest<MyBookmark> {
        return NSFetchRequest<MyBookmark>(entityName: "MyBookmark")
    }

    @NSManaged public var name: String?
    @NSManaged public var url: String?

}

extension MyBookmark : Identifiable {

}

This is for a macOS app

CodePudding user response：

To be able to use MyBookmark in your ForEach properly the search functionality should also work with MyBookmark

So change the search result array to use MyBookmark instead

var searchResults: [MyBookmark] {
    if searchText.isEmpty {
        return items
    } else {
        return items.filter {  
            $0.name.localizedCaseInsensitiveContains(searchText) }
        }
    }
}

CodePudding user response：

That var must return an array of String, but you are returning the array items, which is an array of type MyBookmark.

Solution: convert the array to a type of [String].

Replace that variable with:

         var searchResults: [String] {
            if searchText.isEmpty {
               return items.compactMap { $0.name }
          } else {
              return items.compactMap { $0.name }.filter { $0.localizedCaseInsensitiveContains(searchText) }
            }
         }