Hello together, I hope someone can answer and can give me maybe a little guidance. Is it possible to access and change a child value from a child class in SwiftData? I tried now different ways but couldn't get it to work although I don't get any errors but I am not able to change or set any values.
So the code example below is only a simplified example and I know some minor errors but it is about the principle. Can the Father class access somehow the Children class and for example read the childrenName?
@Model class Father {
var father: String
var child: Child?
}
@Model class Child {
var childName: String
var child: Children?
var father: Father
}
@Model class Children {
var childrenName: String
var parent: Child
}
I don't need direct access from the Father to the Children class - it has to go via the child class.
Thanks for any direction or feedback in advance.
Here is an example if I understand correctly what you want to achieve.
I have changed some var names to make it clearer for me when coding. I also removed the @Model for this test.
/*@Model*/ class Father {
var name: String = ""
var child: Child?
}
/*@Model*/ class Child {
var name: String = ""
var grandChild: GrandChild?
var father: Father = Father()
}
/*@Model*/ class GrandChild {
var name: String = ""
var parent: Child = Child()
}
struct ContentView: View {
@State var fatherEd = Father()
@State var childBob = Child()
@State var grandChildTom = GrandChild()
@State var someChange = false // a trick to force a state change and force redraw ; could be replaced by Observed, but simpler here
init() {
grandChildTom.name = "Tom"
grandChildTom.parent = childBob
childBob.name = "Bob"
childBob.grandChild = grandChildTom
childBob.father = fatherEd
fatherEd.name = "father Eduard"
fatherEd.child = childBob
}
var body: some View {
VStack {
Text("Hello")
Spacer()
.frame(height: 20)
if someChange || !someChange {
Text("father:\(fatherEd.name)")
Spacer()
.frame(height: 20)
if fatherEd.child != nil {
Text("child:\(childBob.name)")
Text("same as \(fatherEd.child!.name)")
}
Spacer()
.frame(height: 20)
if fatherEd.child?.grandChild != nil {
Text("grandchild:\(grandChildTom.name)")
Text("same as \(fatherEd.child!.grandChild!.name)")
}
Spacer()
.frame(height: 20)
}
Button(action: { // Change the grandChild name through the child
if someChange {
fatherEd.child?.grandChild?.name = "Tom"
} else {
fatherEd.child?.grandChild?.name = "Laureen"
}
someChange.toggle() // just to force a change in the state var.
}) {
if someChange {
Text("Revert grandChild name to Tom")
} else {
Text("Change grandChild name to Laureen")
}
}
}
}
}
