How to disable default nil-initialization of Optional - swift

Question

Let's say I have these two structures:
struct DataOne {
let id: String
// ...
}
struct DataTwo {
let id: String
// ...
}
And there is a separate conversion function:
extension DataOne {
func convertToDataTwo() -> DataTwo {
.init(
id: self.id,
// ...
)
}
}
At some point, the var name: String? field is added to both structures:
struct DataOne {
let id: String
var name: String?
// ...
}
struct DataTwo {
let id: String
var name: String?
// ...
}
But the assembly does not swear because the field is optional.
And when converting, the name field is lost.
Is it possible to disable the autofill of the option or to call the warnings?
I tried to find such a rule in SwiftLint, but I didn't find it.

Answer 1

If your var's type is written T? with no default value, and Swift synthesizes a memberwise init for your type, then the synthesized init uses a default value of nil for that var.
However, if your var's type is written Optional<T> with no default value, then the synthesized init does not use a default value.
So write this instead:
struct DataOne {
let id: String
var name: Optional<String>
// ...
}
struct DataTwo {
let id: String
var name: Optional<String>
// ...
}
Or write out your init instead of letting the compiler synthesize it:
struct DataOne {
let id: String
var name: String?
init(id: String, name: String?) {
self.id = id
self.name = name
}
}
struct DataTwo {
let id: String
var name: String?
init(id: String, name: String?) {
self.id = id
self.name = name
}
}
You can use Xcode's Editor > Refactor > Generate Memberwise Initializer command to write most of the init for you, then delete the = nil default: