How to insert into Sqlite with optional parameters using Swift 3 - swift3

Question

I have this class with some optional properties:
class Address {
var Id: Int64
var AddressType: Int64
var AddressStatus: Int64
var Address1: String?
var Address2: String?
var City: String?
var State: String?
var Zip: String?
var Country: String?
var Latitude: Double?
var Longitude: Double?
}
I am trying to insert into a Sqlite database, like this:
let insert = table.insert(or: .replace, Id <- item.Id, AddressType <- item.AddressType, AddressStatus <- item.AddressStatus, Address1 <- item.Address1?, Address2 <- item.Address2?, City <- item.City?, State <- item.State?, Zip <- item.Zip?, Country <- item.Country?, Latitude <- item.Latitude?, Longitude <- item.Longitude?)
But I get this build error:
Value of optional type 'String?' not unwrapped; did you mean to use '!' or '?'?
If I use '!' it will build, but I get this error when I run:
unexpectedly found nil while unwrapping an Optional value
I am still new to Swift, but from what I know, I don't want to use '!' when the value can be nil, correct?
I'm not sure what I'm doing wrong here.

Answer 1

Make all your class properties constants (declare with let) and make them non optional adding a required init() with all your Address properties parameters. BTW it is Swift convention to start your vars naming with a lowercase letter. Note: You should use Int instead of Int64 unless it is a requirement. Regarding the optionality of your properties you can just assign a default value for them at initialization time. Btw It is better to use a struct unless you need to make your object persist (NSCoding compliant):
struct Address {
let id: Int
let addressType: Int
let addressStatus: Int
let address1: String
let address2: String
let city: String
let state: String
let zip: String
let country: String
let latitude: Double?
let longitude: Double?
init(id: Int, addressType: Int, addressStatus: Int, address1: String = "", address2: String = "", city: String = "", state: String = "", zip: String = "", country: String = "", latitude: Double = nil, longitude: Double = nil) {
self.id = id
self.addressType = addressStatus
self.addressStatus = addressStatus
self.address1 = address1
self.address2 = address2
self.city = city
self.state = state
self.zip = zip
self.country = country
self.latitude = latitude
self.longitude = longitude
}
}
So you can create your new object Address as follow:
let address1 = Address(id: 1, addressType: 2, addressStatus: 3)
let address2 = Address(id: 2, addressType: 3, addressStatus: 4, address1: "Any Address", latitude: 22.0, longitude: 43.0) // You don't need to add all parameters as long as you keep them in the same order as your initializer
address2.latitude // 22.0