Listing CoreData object through Relationship - swift

Question

I had this working without CoreData relationships (multiple fetches), but it occurred to me that I should probably have relationships between these entities implemented, so that I can just fetch from a single entity to get all attributes.
When I fetch accountNames from the Accounts entity directly for my AccountsList.swift (to create accounts) - it works just fine, but when I try to call them through the relationship (originAccounts), it doesn't show anything in the list. Same issue for the Categories picker.
I have 3 CoreData entities, and two Pickers (for category and account)
Expenses
expenseAccount:String
expenseCategory:String
expenseCost:Double
expenseDate:Date
expenseId:UUID
expenseIsMonthly:Bool
expenseName:String
Categories
categoryName:String
Accounts
accountName:String
Expenses has a many to one relationship with both Accounts and Categories
import SwiftUI
import CoreData
struct ExpenseDetail: View {
#Environment(\.managedObjectContext) var context
#Environment(\.presentationMode) var presentationMode
#FetchRequest(fetchRequest: Expenses.expensesList)
var results: FetchedResults<Expenses>
var logToEdit: Expenses?
#State var name: String = ""
#State var amount: String = ""
#State var category: String?
#State var date: Date = Date()
#State var account: String?
#State var isMonthly: Bool = false
var currencyFormatter: NumberFormatter = {
let f = NumberFormatter()
f.numberStyle = .currency
return f
}()
var body: some View {
NavigationView {
Form{
TextField("Expense Name", text: $name)
Section{
HStack{
TextField("$\(amount)", text: $amount)
.keyboardType(.decimalPad)
.textFieldStyle(PlainTextFieldStyle())
.disableAutocorrection(true).multilineTextAlignment(.leading)
}
DatePicker(selection: $date, displayedComponents: .date) {
Text("Date")
}.onAppear{self.hideKeyboard()}
Picker(selection: $category, label: Text("Category")) {
ForEach(results) { (log: Expenses) in
Text(log.originCategories?.categoryName ?? "No Category").tag(log.originCategories?.categoryName)
}
}
Picker(selection: $account, label: Text("Account")) {
ForEach(results) { (log: Expenses) in
Text(log.originAccounts?.accountName ?? "No Account").tag(log.originAccounts?.accountName)
}
}
Toggle(isOn: $isMonthly) {
Text("Monthly Expense")
}.toggleStyle(CheckboxToggleStyle())
}
Section{
Button(action: {
onSaveTapped()
}) {
HStack {
Spacer()
Text("Save")
Spacer()
}
}
}
Section{
Button(action: {
self.presentationMode.wrappedValue.dismiss()
}) {
HStack {
Spacer()
Text("Cancel").foregroundColor(.red)
Spacer()
}
}
}
}.navigationBarTitle("Add Expense")
}
}
private func onSaveTapped() {
let expenseLog: Expenses
if let logToEdit = self.logToEdit {
expenseLog = logToEdit
} else {
expenseLog = Expenses(context: self.context)
expenseLog.expenseId = UUID()
}
expenseLog.expenseName = self.name
expenseLog.originCategories?.categoryName = self.category
expenseLog.expenseCost = Double(self.amount) ?? 0
expenseLog.expenseDate = self.date
expenseLog.originAccounts?.accountName = self.account
print("\(self.account ?? "NoAccountValue")")
expenseLog.expenseIsMonthly = self.isMonthly
do {
try context.save()
} catch let error as NSError {
print(error.localizedDescription)
}
self.presentationMode.wrappedValue.dismiss()
}
}
#if canImport(UIKit)
extension View {
func hideKeyboard() {
UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
}
}
#endif
struct ExpenseDetail_Previews: PreviewProvider {
static var previews: some View {
ExpenseDetail()
}
}
struct CheckboxToggleStyle: ToggleStyle {
func makeBody(configuration: Configuration) -> some View {
return HStack {
configuration.label
Spacer()
Image(systemName: configuration.isOn ? "checkmark.square" : "square")
.resizable()
.frame(width: 22, height: 22)
.onTapGesture { configuration.isOn.toggle() }
}
}
}
expensesList fetch details, if needed
static var expensesList: NSFetchRequest<Expenses> {
let request: NSFetchRequest<Expenses> = Expenses.fetchRequest()
request.sortDescriptors = [NSSortDescriptor(key: "expenseName", ascending: true)]
return request
}