Not able to use one-to-many relationship in sharkORM - ios

Question

I'm using KeyValueObjectMapping to convert JSON string to Model class.
Here is JSON string:
{
"id_str": "123456",
"name": "Some Name",
"protected": false,
"created_at": "Tue Mar 31 18:01:12 +0000 2009",
"tweets" : [
{
"created_at" : "Sat Apr 14 00:20:07 +0000 2012",
"id_str" : 190957570511478784,
"text" : "Tweet text",
"comments": {
"id_str":"2343",
"text":"This is comment1"
}
},
{
"created_at" : "Sat Apr 14 00:20:07 +0000 2012",
"id_str" : 190957570511478784,
"text" : "Tweet text",
"comments": {
"id_str":"2343",
"text":"This is comment2"
}
}
]
}
For which I have created model classes, like this:
For User,
#interface User : SRKObject
#property(nonatomic, strong) NSString *idStr;
#property(nonatomic, strong) NSString *name;
#property(nonatomic, strong) BOOL protected;
#property(nonatomic, strong) NSDate *createdAt;
#property(nonatomic, strong) NSArray *tweets;
#end
For tweets,
#interface Tweet : SRKObject
#property(nonatomic, strong) NSString *idStr;
#property(nonatomic, strong) NSString *text;
#property(nonatomic, strong) NSDate *createdAt;
#property(nonatomic, strong) Comments *comments;
#end
For Comments,
#interface Comments : SRKObject
#property(nonatomic, strong) NSString *idStr;
#property(nonatomic, strong) NSString *text;
#end
It is working absolutely fine and I'm getting tweets in array. And I get tweets as user.tweets.
To save this in database, I'm using SharkORM for ORM. But while saving either it crash or don't save tweets at all.
Here is the issue open in repo (but using different example) - https://github.com/sharksync/sharkorm/issues/78

Answer 1

The reason for the crash was the persistence of an array of Tweets stored in a User object as opposed to storing them as a separate class. See: This
Ultimately what you want to end up with is ....
#interface Tweet : NSObject
#property(nonatomic, strong) User* user;
#property(nonatomic, strong) NSString *idStr;
#property(nonatomic, strong) NSString *text;
#property(nonatomic, strong) NSDate *createdAt;
#end
As storing all tweets in an array object will just tie you in knots quickly (no searching, ever increasing save times).
So, when you get the JSON down, you can map the first class no problem, then iterate the tweets creating objects which are related to the User class.
Relating objects is just a case of setting the .user property with the relevant User entity which you have either created or queried for.

Answer 2

Thanks to #Adrian_H for the efforts. I figured out the solution and posting here.
I have added below code in Tweet & Comments model to save tweets as NSArray and comments as model object and it worked.
- (void)encodeWithCoder:(NSCoder *)aCoder;
-(id)initWithCoder:(NSCoder *)aDecoder;