Model1.swift

public enum Model: String {
    case Company
    case Team
    case Employee
}

extension NSEntityDescription {
    public class func entity(model: Model, inManagedObjectContext context: NSManagedObjectContext) -> NSEntityDescription {
        // Since we know we always have a matching entity, we can just force-unwrap this.
        return NSEntityDescription.entityForName(model.rawValue, inManagedObjectContext: context)!
    }
}

extension NSFetchResult {
    public convenience init(model: Model) {
        self.init(name: model.rawValue)
    }
}

public final class Employee: NSManagedObject {

    // properties here

    public init(/* properties here */, inManagedObjectContext context: NSManagedObjectContext) {
        let entity = NSEntityDescription.entity(Model.Employee, inManagedObjectContext: context)
        super.init(entity: entity, insertIntoManagedObjectContext: context)

        // initialize properties
    }

}

// To create an object:
Employee(..., inManagedObjectContext: context)

// To create a fetch result:
NSFetchResult(model: Model.Employee)

Model2.swift

public enum Model: String {
    case Company
    case Team
    case Employee
    
    public func entityInManagedObjectContext(context: NSManagedObjectContext) -> NSEntityDescription {
        // Since we know we always have a matching entity, we can just force-unwrap this.
        return NSEntityDescription.entityForName(self.rawValue, inManagedObjectContext: context)!
    }
    
    public func fetchResult() -> NSFetchResult {
        return NSFetchResult(name: self.rawValue)
    }
}

public final class Employee: NSManagedObject {

    // properties here

    public init(/* properties here */, inManagedObjectContext context: NSManagedObjectContext) {
        let entity = Model.Employee.entityInManagedObjectContext(context)
        super.init(entity: entity, insertIntoManagedObjectContext: context)

        // initialize properties
    }

}

// To create an object:
Employee(..., inManagedObjectContext: context)

// To create a fetch result:
Model.Employee.fetchResult()