Issue with creating and then updating existing elements in Realm database - swift

Question

I have a realm database which consists of Year -> Month -> Day -> Items
arrows go from parent category to the child category.
I am able to save the calculation once but if I do it again it will throw an error that Month of a primary key 0 already exists. I do know what it exists that is why I want Realm to update it. As I want to save each month only once and each year only once.
//MARK: - Realm Database Saving option
#objc func saveCalculation(){
let date = Date()
let dateElements = getDate()
let yearObject = Year()
yearObject.number = dateElements.year
let monthObject = Month()
monthObject.number = dateElements.month
monthObject.monthName = dateElements.monthName
let dayObject = Day()
dayObject.id = realm.objects(Day.self).count
dayObject.date = date
dayObject.number = dateElements.day
dayObject.dayName = dateElements.dayNameInWeek
dayObject.hoursPerDay = hoursPerDay
dayObject.ratePerHour = ratePerHour
dayObject.minutesOfNormalPay = minutesOfNormalPay
dayObject.earnedPerDay = earnedPerDay
dayObject.howManyRows = rowViews.count
do {
try realm.write {
realm.add(yearObject, update: true)
yearObject.months.append(monthObject)
realm.add(monthObject, update: true)
monthObject.days.append(dayObject)
realm.add(dayObject, update: false)
for (index, row) in rowViews.enumerated() {
let item = Item()
item.id = index
item.date = date
item.amount = Double(row.amountTextField.text!) ?? 0.0
item.price = Double(row.priceTextField.text!) ?? 0.0
print("Item amount: \(item.amount) and price: \(item.price)")
dayObject.items.append(item)
realm.add(item)
}
}
} catch {
print(error.localizedDescription)
}
}
func getDate() -> (day: Int, dayNameInWeek: String, month: Int, monthName: String, year: Int) {
let date = Date()
let dayNameInWeek = date.getDayName()
let monthName = date.getMonthName()
let calendar = Calendar.current
let components = calendar.dateComponents([.year, .month, .day], from: date)
let year = components.year!
let month = components.month!
let day = components.day!
print(year)
print(month)
print(monthName)
print(day)
print(dayNameInWeek)
return (day,dayNameInWeek, month, monthName, year)
}
each database class respectively:
import Foundation
import RealmSwift
class Year: Object {
//#objc dynamic var year = Date()
#objc dynamic var id: Int = 0
#objc dynamic var number: Int = 2008
let months = List<Month>() //forward relationship to Months
override class func primaryKey() -> String {
return "id"
}
}
Month:
import Foundation
import RealmSwift
class Month: Object {
#objc dynamic var id: Int = 0
#objc dynamic var number: Int = 0
#objc dynamic var monthName: String = ""
#objc dynamic var monthYear: Int = 0
let days = List<Day>() //forward relationship to Days
let parentYear = LinkingObjects(fromType: Year.self, property: "months") //back relationship to year
override class func primaryKey() -> String {
return "id"
}
}
Day:
import Foundation
import RealmSwift
class Day: Object {
#objc dynamic var id: Int = 0
#objc dynamic var date: Date = Date()
#objc dynamic var number: Int = 0
#objc dynamic var dayName: String = ""
#objc dynamic var hoursPerDay: Double = 0.0
#objc dynamic var ratePerHour: Double = 0.0
#objc dynamic var minutesOfNormalPay: Double = 0.0
#objc dynamic var earnedPerDay: Double = 0.0
#objc dynamic var howManyRows: Int = 0
let items = List<Item>() //forward relationship to Items
let parentMonth = LinkingObjects(fromType: Month.self, property: "days") //back relationship to months
override class func primaryKey() -> String {
return "id"
}
}
Item:
import Foundation
import RealmSwift
class Item: Object {
#objc dynamic var id: Int = 0
#objc dynamic var date: Date = Date()
#objc dynamic var amount: Double = 0.0
#objc dynamic var price: Double = 0.0
let parentDay = LinkingObjects(fromType: Day.self, property: "items") //back relationship to days
}

Answer 1

I have managed to solve the problem with some if else conditions. If someone knows a cleeaner way of writing it then please post it below, as I am really interested of getting this code shortened.
//MARK: - Realm Database Saving option
#objc func saveCalculation(){
let date = Date()
let dateElements = getDate()
var isParentYear = false
var isParentMonth = false
let yearObject: Year
if let currentYearObject = realm.objects(Year.self).first(where: {$0.number == dateElements.year}) {
yearObject = currentYearObject
isParentYear = true
} else {
yearObject = Year()
yearObject.id = realm.objects(Year.self).count
yearObject.number = dateElements.year
}
let monthObject: Month
if let currentMonthObject = realm.objects(Month.self).first(where: {$0.monthYear == dateElements.year && $0.number == dateElements.month}) {
monthObject = currentMonthObject
isParentMonth = true
} else {
monthObject = Month()
monthObject.id = realm.objects(Month.self).count
monthObject.number = dateElements.month
monthObject.monthYear = dateElements.year
monthObject.monthName = dateElements.monthName
}
let dayObject = Day()
dayObject.id = realm.objects(Day.self).count
dayObject.date = date
dayObject.number = dateElements.day
dayObject.dayName = dateElements.dayNameInWeek
dayObject.hoursPerDay = hoursPerDay
dayObject.ratePerHour = ratePerHour
dayObject.minutesOfNormalPay = minutesOfNormalPay
dayObject.earnedPerDay = earnedPerDay
dayObject.howManyRows = rowViews.count
do {
try realm.write {
if isParentYear && isParentMonth{
print("Parent Year is: \(isParentYear) and parent Month is: \(isParentMonth)")
monthObject.days.append(dayObject)
realm.add(dayObject, update: false)
} else if isParentYear && !isParentMonth {
print("Parent Year is: \(isParentYear) and parent Month is: \(isParentMonth)")
yearObject.months.append(monthObject)
realm.add(monthObject, update: true)
monthObject.days.append(dayObject)
realm.add(dayObject, update: false)
} else if !isParentYear && !isParentMonth {
print("Parent Year is: \(isParentYear) and parent Month is: \(isParentMonth)")
realm.add(yearObject, update: true)
yearObject.months.append(monthObject)
realm.add(monthObject, update: true)
monthObject.days.append(dayObject)
realm.add(dayObject, update: false)
} else {
print("THISH SHOULD NEVER BE CALLED IF CALLED SOMETHING IS VERY WRONG")
}
for (index, row) in rowViews.enumerated() {
let item = Item()
item.id = index
item.date = date
item.amount = Double(row.amountTextField.text!) ?? 0.0
item.price = Double(row.priceTextField.text!) ?? 0.0
print("Item amount: \(item.amount) and price: \(item.price)")
dayObject.items.append(item)
realm.add(item)
}
}
} catch {
print(error.localizedDescription)
}
}