Error with NSJSONSerialization - Invalid type in JSON write (Menu)

Question

I have an App using core data with 3 entities with very similar attributes. The relationship is such as:

Branch ->> Menu ->> Category ->> FoodItem

Each ent

Answer 1

There is a class method isValidJSONObject on NSJSONSerialization that tells you if a object can be serialised. As Julien pointed out you probably have to convert your object to a NSDictionary. NSManagedModel provides some handy methods to get all your attributes for your entity. So you could create a category for NSManagedObject that has a method to convert it over to a NSDictionary. This way you don't have to write a toDictionary method for each entity you want to convert to a dictionary.

@implementation NSManagedObject (JSON)

- (NSDictionary *)toDictionary
{
    NSArray *attributes = [[self.entity attributesByName] allKeys];
    NSDictionary *dict = [self dictionaryWithValuesForKeys:attributes];
    return dict;
}