Chat

#import <Realm/Realm.h>
#import "Member.h"

@interface Chat : RLMObject

@property NSString *Id;
@property NSString *info;
@property RLMArray<Member *> <Member> *members;

@end


@implementation Chat

+ (NSString *)primaryKey {
    return @"Id";
}

@end

Member

#import <Realm/Realm.h>

@class User;

@interface Member : RLMObject

@property NSString *Id;
@property NSString *info;
@property User *user;

@end

RLM_ARRAY_TYPE(Member)


@implementation Member

+ (NSString *)primaryKey {
    return @"Id";
}

@end

User

#import <Realm/Realm.h>

@interface User : RLMObject

@property NSString *Id;
@property NSString *name;
@property NSString *status;

@end
  
  
@implementation User

+ (NSString *)primaryKey {
    return @"Id";
}

@end

ViewController.m

#import "ViewController.h"
#import <Realm/Realm.h>
#import "User.h"
#import "Member.h"
#import "Chat.h"

@interface ViewController ()

@property Chat *chat;
@property RLMResults *list;
@property RLMNotificationToken *tokenChat;
@property RLMNotificationToken *tokenList;

@property RLMRealm *realm;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    _realm = [RLMRealm defaultRealm];
    
    [self _generateChat];
    [self _configureResults];
    [self _configureListResults];
}

#pragma mark - Actions
- (IBAction)changeChat:(id)sender {
    [_realm beginWriteTransaction];
    
    Chat *obj = [Chat objectInRealm:_realm forPrimaryKey:@"first"];
    obj.info = [NSUUID UUID].UUIDString;
    
    [_realm addOrUpdateObjects:@[obj]];
    [_realm commitWriteTransaction];
}

- (IBAction)changeMember:(id)sender {
    [_realm beginWriteTransaction];

    Member *member = [Member objectInRealm:_realm forPrimaryKey:@"member_0"];
    member.info = [NSUUID UUID].UUIDString;

    [_realm addOrUpdateObjects:@[member]];
    [_realm commitWriteTransaction];
}

- (IBAction)changeUser:(id)sender {
    [_realm beginWriteTransaction];

    User *user = [User objectInRealm:_realm forPrimaryKey:@"user_0"];
    user.name = [NSUUID UUID].UUIDString;
    
    [_realm addOrUpdateObjects:@[user]];
    [_realm commitWriteTransaction];
}

#pragma mark - Configure
- (void)_configureResults {
    Chat *chat = [Chat objectInRealm:_realm forPrimaryKey:@"first"];

    RLMNotificationToken *tok = [chat addNotificationBlock:^(BOOL deleted, NSArray<RLMPropertyChange *> * _Nullable changes, NSError * _Nullable error) {
        NSLog(@"== receive notification chat ==");
    }];
    _tokenChat = tok;
    _chat = chat;
}

- (void)_configureListResults {
    RLMResults *res = [Chat allObjects];
    
    RLMNotificationToken *tok = [res addNotificationBlock:^(RLMResults * _Nullable results, RLMCollectionChange * _Nullable change, NSError * _Nullable error) {
        NSLog(@"== receive notification list ==");
    }];
    _tokenList = tok;
    _list = res;
}

#pragma mark - Generate
- (void)_generateChat {
    Chat *chat = [Chat new];
    chat.Id = @"first";
    
    for (NSInteger i = 0; i < 10; i ++) {
        User *user = [[User alloc] init];
        user.Id = [NSString stringWithFormat:@"user_%lu",i];
        user.status = @"hello";
        Member *member = [[Member alloc] init];
        member.Id = [NSString stringWithFormat:@"member_%lu",i];
        member.user = user;
    
        [chat.members addObject:member];
    }
    
    [self _saveChat:chat];
}

#pragma mark - Storage
- (void)_saveChat:(Chat *)chat {
    RLMRealm *realm = _realm;
    [realm beginWriteTransaction];
    [realm addOrUpdateObject:chat];
    [realm commitWriteTransaction];
}

@end