Question

I would like to use JSON in my application, i have not never use it. i have an object like this :

@interface Selection : NSManagedObject

@property (nonatomic, retain) NSString * book_id;
@property (nonatomic, retain) NSString * contenu;
@property (nonatomic, retain) NSNumber * page_id;
@property (nonatomic, retain) NSNumber * nbrOfOccurences;
@property (nonatomic, retain) NSString * next;
@property (nonatomic, retain) NSString * previous;

@end

I would like to construct the JSON to synchronize to my server. What is the structure to use of my objects "Selection", i.e. : How to represent many objects of "Selection" in JSON format ? thanks for your answers.

Answer 1

Do this:

NSArray *objects = [NSArray arrayWithObjects:book_id, 
                                             contenu,
                                             page_id,
                                             nbrOfOccurences,
                                             next,
                                             previous,
                                             nil];
NSError *error = nil;
NSData *jsonData = [JSONSerializer dataWithJSONObject:objects
                                              options:0
                                                error:&error];

Now jsonData contains a JSON-encoded representation of the objects array. To get them back, reverse the process:

NSArray *objects = [JSONSerializer JSONObjectWithData:jsonData
                                              options:0
                                              error:&error];