根据模型类获取 CoreData 实体，而不是创建单独的 NSManaged 子类

Question

Let's say I have a model like below

class Employee: Codable {    
    var id: String?
    var personalDetails: Person?
}

class Person: Codable {
    var firstName:String?
    var lastName: String?
}

Now I have to maintain an Entity (say DBEmployee) inside CoreData which will have the exact same properties

Now, is there a way to NOT create a separate NSManaged subclass(DBEmployee) for that entity which will have the same properties(as Employee) and have that entity extract it's properties as per the properties of Employee

My main problem is when I create my CoreData operations for fetch, it returns me DBEmployee which I then have to convert to Employee which has exactly the same properties (because the method that uses this fetch accepts Employee as the parameter and not DBEmployee)

Answer 1

You can get values back as either a NSManaged object / subclass or a dictionary of [String:Any] depending on the fetch result type. However, neither of those is a POSO (plain old Swift object.)

Since they both have the exact same properties, can you can change the method / API to take a protocol instead?

It really comes down to if the API really needs a Codable model (because it's going to serialize it, for example) or if you can change the method (or possibly add to it)