PFObject Subclass as a Property in another PFObject Subclass - ios

Question

[X-Post from parse.com]
Person is a subclass of PFObject.
Address is also a subclass of PFObject. Address has a #property of type Person.
i.e.
// Person.h
#interface Person : PFObject<PFSubclassing>
#property (retain) NSString *firstName;
#property (retain) NSString *secondName;
+ (NSString *)parseClassName;
#end
// Person.m
#import <Parse/PFObject+Subclass.h>
#implementation PP4MEAddress
#dynamic firstName;
#dynamic firstName;
+ (NSString *)parseClassName {
return #"Person";
}
// Address.h
#interface Address : PFObject<PFSubclassing>
#property (retain) Person *deliverToPerson;
#property (retain) NSString *line1;
#property (retain) NSString *line2;
+ (NSString *)parseClassName;
// Address.m
#import <Parse/PFObject+Subclass.h>
#implementation PP4MEAddress
#dynamic deliverToPerson;
#dynamic line1;
#dynamic line2;
+ (NSString *)parseClassName {
return #"Address";
}
Both subclasses are registered in the App Delegate.
In a method in MyViewController I want to set these as so
e.g.
-(void)myMethod
{
Address *address = [Address object];
address.deliverToPerson.firstName = #"John";
address.deliverToPerson.secondName = #"Smith";
address.line1 = #"123";
address.line2 = #"Main Street";
[address saveInBackground];
}
When this code executes, an entry of Class Address is input into the Data Browser on the Parse.com Web App. However, the only columns are objectId, createdAt, updatedAt and ACL
I imagine this is because, under the hood the Address #property of type Person is not being allocated and initialised.
How do I overcome this?
Do I write a custom setter and getter for
#property (retain) Person *deliverToPerson;
in Address.m ?
If so, I notice that the #property is atomic and thus will I need to write locking code in said setter and getter?
Thank You

Answer 1

I am not familiar with parse.com, but I strongly assume that you have to
allocate the Person object before setting the relationship. Something like
Address *address = [Address object];
address.line1 = #"123";
address.line2 = #"Main Street";
Person *person = [Person object];
person.firstName = #"John";
person.secondName = #"Smith";
address.deliverToPerson = person;
[address saveInBackground];

Answer 2

you have to set your PFobject
like this
PFObject *anotherPlayer = [PFObject objectWithClassName:#"Player"];
[anotherPlayer setObject:#"DataValue" forKey:#"Name"];