SwiftData context is empty after saving

Using Swift
1

Hi there,

Super beginner in Swift and SwiftData here. I created a simple project to import data from a .json file into a Swift model using SwiftData. The process involves loading and decoding the .json file, then saving the data into a model context. However, when I attempt to fetch the data from context, the result is empty. I’ve highlighted the issue within the code.

struct ContentView: View {
    @Environment(\.modelContext) private var modelContext
    @Query private var dataItems: [DataItem]
    var body: some View {
            Button("Import JSON to SwiftData") {
                importJSONToSwiftData(context: modelContext)
// some other views
// ....
}

func importJSONToSwiftData(context: ModelContext) {
        if let jsonData = loadJSON() {
            if let decodedData = decodeJSON(data: jsonData) {
                saveToSwiftData(decodedData: decodedData, context: context)
            }
        }
    }

func saveToSwiftData(decodedData: [MyData], context: ModelContext) {
    
    for item in decodedData {
        let newData = DataItem(field1: item.field1, field2: item.field2)
        // the newData is as expected
        context.insert(newData)
    }
    do {
            try context.save() // Persist the changes to SwiftData
            
// PROBLEM: try to fetch but get nothing
        } catch {
            print("Failed to save data to SwiftData: \(error)")
    }
}


struct MyData: Codable {
    let field1: String
    let field2: Int
}

@Model
class DataItem: Identifiable {
    
    var id: String
    var field1: String
    var field2: Int

    init(field1: String, field2: Int) {
        self.id = UUID().uuidString
        self.field1 = field1
        self.field2 = field2
    }
}

Thanks for any responds.