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// DogToy.h
@interface DogToy : RLMObject
@property NSString *name;
@end
// Dog.h
@interface Dog : RLMObject
@property NSString *name;
@property int age;
@property NSString *color;
// To-one relationship
@property DogToy *favoriteToy;
@end
// Enable Dog for use in RLMArray
RLM_COLLECTION_TYPE(Dog)
// Person.h
// A person has a primary key ID, a collection of dogs, and can be a member of multiple clubs.
@interface Person : RLMObject
@property int _id;
@property NSString *name;
// To-many relationship - a person can have many dogs
@property RLMArray<Dog *><Dog> *dogs;
// Inverse relationship - a person can be a member of many clubs
@property (readonly) RLMLinkingObjects *clubs;
@end
RLM_COLLECTION_TYPE(Person)
// DogClub.h
@interface DogClub : RLMObject
@property NSString *name;
@property RLMArray<Person *><Person> *members;
@end
// Dog.m
@implementation Dog
@end
// DogToy.m
@implementation DogToy
@end
// Person.m
@implementation Person
// Define the primary key for the class
+ (NSString *)primaryKey {
    return @"_id";
}
// Define the inverse relationship to dog clubs
+ (NSDictionary *)linkingObjectsProperties {
    return @{
        @"clubs": [RLMPropertyDescriptor descriptorWithClass:DogClub.class propertyName:@"members"],
    };
}
@end
// DogClub.m
@implementation DogClub
@end

// Get the default realm.
// You only need to do this once per thread.
RLMRealm *realm = [RLMRealm defaultRealm];
// Instantiate the class.
Dog *dog = [[Dog alloc] init];
dog.name = @"Max";
dog.age = 5;
// Open a thread-safe transaction.
[realm transactionWithBlock:^() {
    // Add the instance to the realm.
    [realm addObject:dog];
}];

// (1) Create a Dog object from a dictionary
Dog *myDog = [[Dog alloc] initWithValue:@{@"name" : @"Pluto", @"age" : @3}];
// (2) Create a Dog object from an array
Dog *myOtherDog = [[Dog alloc] initWithValue:@[@"Pluto", @3]];
RLMRealm *realm = [RLMRealm defaultRealm];
// Add to the realm with transaction
[realm transactionWithBlock:^() {
    [realm addObject:myDog];
    [realm addObject:myOtherDog];
}];

// Instead of using pre-existing dogs...
Person *aPerson = [[Person alloc]
    initWithValue:@[@123, @"Jane", @[aDog, anotherDog]]];
// ...we can create them inline
Person *anotherPerson = [[Person alloc]
    initWithValue:@[@123, @"Jane", @[@[@"Buster", @5], @[@"Buddy", @6]]]];

// Specify a dog toy in JSON
NSData *data = [@"{\"name\": \"Tennis ball\"}" dataUsingEncoding: NSUTF8StringEncoding];
RLMRealm *realm = [RLMRealm defaultRealm];
// Insert from NSData containing JSON
[realm transactionWithBlock:^{
    id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];
    [DogToy createInRealm:realm withValue:json];
}];

RLMRealm *realm = [RLMRealm defaultRealm];
[realm transactionWithBlock:^{
    Address *address = [[Address alloc] init];
    address.street = @"123 Fake St.";
    address.city = @"Springfield";
    address.country = @"USA";
    address.postalCode = @"90710";
    
    Contact *contact = [Contact contactWithName:@"Nick Riviera"];
    
    // Assign the embedded object property
    contact.address = address;
    [realm addObject:contact];
    
    NSLog(@"Added contact: %@", contact);
}];