Picker using SwiftData

I am attempting to impliment a a Picker that uses SwiftData to fill in the choices. I am missing something because I can get the picker to appear with the proper selections but the picker does not register my choice (no check mark appears and the text in the picker window is blank after I move to the next field.

The model import Foundation import SwiftData //Model one: type of contract, i.e. Firm Fixed Price, etc @Model final class TypeOfContract { var contracts: [Contract] @Attribute(.unique) var typeName: String @Attribute(.unique) var typeCode: String var typeDescription: String

init(contracts: [Contract], typeName: String = "", typeCode: String = "", typeDescription: String = "") {
    self.contracts = contracts
    self.typeName = typeName
    self.typeCode = typeCode
    self.typeDescription = typeDescription
}

} //Model two: the Contract @Model final class Contract { var contractType: TypeOfContract? var costReports: [CostReport] @Attribute(.unique) var contractNumber: String @Attribute(.unique) var contractName: String var startDate: Date var endDate: Date var contractValue: Decimal var contractCompany: String var contractContact: String var contactEmail: String var contactPhone: String var contractNotes: String init(contractType: TypeOfContract? = nil, costReports: [CostReport], contractNumber: String = "", contractName: String = "", startDate: Date = .now, endDate: Date = .now, contractValue: Decimal = 0.00, contractCompany: String = "", contractContact: String = "", contactEmail: String = "", contactPhone: String = "", contractNotes: String = "") { self.contractType = contractType self.costReports = costReports self.contractNumber = contractNumber self.contractName = contractName self.startDate = startDate self.endDate = endDate self.contractValue = contractValue self.contractCompany = contractCompany self.contractContact = contractContact self.contactEmail = contactEmail self.contactPhone = contactPhone self.contractNotes = contractNotes } } //Model Three: The Cost Reports @Model final class CostReport { var contract: Contract? var periodStartDate: Date var periodEndDate: Date var bCWP: Double //Budgeted Cost Work Performed var aCWP: Double //Actual Cost Work Performed var bCWS: Double //Budgeted Cost Work Scheduled //Calculated fields

init(contract: Contract? = nil, periodStartDate: Date = .now, periodEndDate: Date = .now, bCWP: Double = 0.0, aCWP: Double = 0.0, bCWS: Double = 0.0) {
    self.contract = contract
    self.periodStartDate = periodStartDate
    self.periodEndDate = periodEndDate
    self.bCWP = bCWP
    self.aCWP = aCWP
    self.bCWS = bCWS
    
}

} The Swift Code for the input form

import SwiftData
struct EnterNewContract: View {
    @Environment(\.modelContext) var modelContext
    @Query(sort: \TypeOfContract.typeCode) private var typeOfContracts: [TypeOfContract]
    @Query private var contracts: [Contract]
    @State private var costReports: [CostReport] = []
    @State private var contractType: [TypeOfContract] = []
    @State private var contractNumber: String = ""
    @State private var contractName: String = ""
    @State private var startDate: Date = Date()
    @State private var endDate: Date = Date()
    @State private var contractValue: Decimal = 0
    @State private var contractCompany: String = ""
    @State private var contractContact: String = ""
    @State private var contactEmail: String = ""
    @State private var contactPhone: String = ""
    @State private var contractNotes: String = ""
    var body: some View {
        Form {
            VStack {
            Section(header: Text("Enter New Contract")
                .foregroundStyle(.green)
                .font(.headline)){
                    Picker("Select a type of contract", selection: $contractType) {
                        ForEach(typeOfContracts, id: \.self) { typeOfContracts in
                            Text(typeOfContracts.typeCode)
                                .tag(contractType)
                        }
                    }
                TextField("Contract Number", text: $contractNumber)
                    .frame(width: 800, height: 40)
                TextField("Contract Name", text: $contractName)
                    .frame(width: 800, height: 40)
                DatePicker("Contract Start Date", selection: $startDate, displayedComponents: [.date])
                    DatePicker("Contract End Date", selection: $endDate, displayedComponents: [.date])
                    
                }
            }
        }
    }
}