Present User an error message when SwiftData save fails

Have a data model that sets certain fields as unique. If the user attempts to save a duplicate value, the save fails quietly with no indication to the user that the save failed. The program is on Mac OS 26.0.1

    @Environment(\.modelContext) var modelContext
    @Query private var typeOfContracts: [TypeOfContract]
    @State private var typeName: String = ""
    @State private var typeCode: String = ""
    @State private var typeDescription: String = ""
    @State private var contracts: [Contract] = []
    @State private var errorMessage: String? = "Data Entered"
    @State private var showAlert: Bool = false
    var body: some View {
        Form {
            Text("Enter New Contract Type")
                .font(.largeTitle)
                .foregroundStyle(Color(.green))
                .multilineTextAlignment(.center)
                TextField("Contract Type Name", text: $typeName)
                    .frame(width: 800, height: 40)
                TextField("Contract Type Code", text: $typeCode)
                    .frame(width: 800, height: 40)
                Text("Contract Type Description")
                TextEditor(text: $typeDescription)
                    .frame(width: 800, height: 200)
                    .scrollContentBackground(.hidden)
                    .background(Color.teal)
                    .font(.system(size: 24))
            Button(action: {
                self.saveContractType()
            })
            {
                Text("Save new contract type")
            }
        }
        
    }
    
    func saveContractType() {
        let typeOfContract = TypeOfContract(contracts: [])
        typeOfContract.typeName = typeName
        typeOfContract.typeCode = typeCode
        typeOfContract.typeDescription = typeDescription
        modelContext.insert(typeOfContract)
        do {
            try modelContext.save()
        }catch {
            errorMessage = "Error saving data: \(error.localizedDescription)"
            
        }
    }
}

I have tried to set alerts but Xcode tells me that the alerts are not in scope