Binding var inside NSPredicate - SwiftUI

user_15294351 0
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I am trying to compose a dynamic filter in my Codre Data filters like this (using SwiftUI):

@State var NumberOfRooms: Int
    init(NumberOfRooms: Int) {
        self.NumberOfRooms = NumberOfRooms
    }

    @FetchRequest(entity: Listing.entity(),sortDescriptors:[NSSortDescriptor(keyPath: \Listing.publishdate, ascending: false),],predicate: NSPredicate(format: "category == %@ AND rooms ", "House", "\($NumberOfRooms)"))

In the view i want to modify the value of the variable like this:

Text("2")
      .onTapGesture {
       self.NumberOfRooms = 2
       }

I get the error at NSPredicate:

Cannot use instance member '$NumberOfRooms' within property initializer; property initializers run before 'self' is available

Basically i want to dynamically compose the predicates. Any help is deeply appreciated.

swiftui nspredicate core-data
1 Answers

Initialize your request inside the init like this.

var fetchRequest: FetchRequest<Listing>

@State var NumberOfRooms: Int = 10

init(NumberOfRooms: Int) {
    fetchRequest = FetchRequest<BlogIdea>(entity: Listing.entity(),sortDescriptors:[],predicate: NSPredicate(format: "category == %@ AND rooms ", "House", "\(NumberOfRooms)"))
    self.NumberOfRooms = NumberOfRooms
}
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