MTJSONUtils
An NSObject category for when you're working with it converting to/from JSON.
Installation
In your Podfile, add this line:
pod "MTJSONUtils"
Methods
Use the following for a shortcut to generating JSON data from a dictionary (or any NSObject):
- (NSData *)JSONData;
The requirements of NSJSONSerialization state that all objects must be instances of NSString, NSNumber, NSArray, NSDictionary, or NSNull. The following can be called on any NSObject and will return a safe deep copy of the receiver:
- (id)objectWithJSONSafeObjects;
This will:
- Replace NSDate objects with their ISO string representation. (e.g.
2012-08-12T04:17:30Z) - Replace any other non-valid objects with their string description.
- More coming...
The following methods allow you to query into an object graph that includes arrays (not just dictionaries):
- (id)valueForComplexKeyPath:(NSString *)keyPath;
- (NSString *)stringValueForComplexKeyPath:(NSString *)key;
Available Subscripting Values:
- 0..infinity
- first
- last
Example
Given this object:
NSDictionary *dictionary = @{
@"parent" : @{
@"name" : @"Nathan",
@"children" : @[ @{
@"name" : @"adam",
@"apple_products" : @[ @{
@"title" : @"macbook",
@"price" : @1399.99,
@"date_bought" : [NSDate dateWithTimeInterval:-22342 sinceDate:[NSDate date]]
},
@{
@"title" : @"mac mini",
@"price" : @599.99,
@"date_bought" : [NSDate dateWithTimeInterval:-30223 sinceDate:[NSDate date]]
},
@{
@"title" : @"iphone",
@"price" : @199.99,
@"date_bought" : [NSDate dateWithTimeInterval:-123453 sinceDate:[NSDate date]]
}]
},
@{
@"name" : @"amanda",
@"apple_products" : @[ @{
@"title" : @"nano",
@"price" : @299.99,
@"date_bought" : [NSDate dateWithTimeInterval:-123453 sinceDate:[NSDate date]]
}]
},
@{
@"name" : @"andrew",
@"apple_products" : @[ @{
@"title" : @"ipad",
@"price" : @499.99,
@"date_bought" : [NSDate dateWithTimeInterval:-2452342 sinceDate:[NSDate date]]
},
@{
@"title" : @"ipod touch",
@"price" : @399.99,
@"date_bought" : [NSDate dateWithTimeInterval:-430223 sinceDate:[NSDate date]]
}]
}]
}
};
You could query the values like this:
[[dictionary valueForComplexKeyPath:@"parent.name"] // => "Nathan"
[[dictionary valueForComplexKeyPath:@"parent.children[0].name"] // => "adam"
[[dictionary valueForComplexKeyPath:@"parent.children[1].name"] // => "amanda"
[[dictionary valueForComplexKeyPath:@"parent.children[2].name"] // => "andrew"
[[dictionary valueForComplexKeyPath:@"parent.children[first].name"] // => "adam"
[[dictionary valueForComplexKeyPath:@"parent.children[last].name"] // => "andrew"
[[dictionary valueForComplexKeyPath:@"parent.children[first].apple_products[0].title"] // => "macbook"
[[dictionary valueForComplexKeyPath:@"parent.children[first].apple_products[1].title"] // => "mac mini"
[[dictionary valueForComplexKeyPath:@"parent.children[first].apple_products[2].title"] // => "iphone"
[[dictionary valueForComplexKeyPath:@"parent.children[first].apple_products[last].title"] // => "iphone"
[[dictionary valueForComplexKeyPath:@"parent.children[last].apple_products[last].title"] // => "ipod touch"
[[dictionary valueForComplexKeyPath:@"parent.children[last].apple_products[last].price"] // => 399.99
Misc
And some nifty macros for dealing with NSNull and nil:
// swaps NSNull for nil
#define NILL(a) ([a isKindOfClass:[NSNull class]] ? nil : a)
// swaps nil for NSNull
#define NUL(a) a ? a : [NSNull null]
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