Polymorph

Polymorph transforms the enemy into a sheep.

Transform value of dictionary to property of Objective-C class, by using a @dynamic like directive.

Usage

Say we have a Movie class.

@interface Movie : PLMModel

@property (nonatomic, readonly) NSString *identifier;
@property (nonatomic, readonly) NSString *title;
@property (nonatomic, readonly) NSString *year;
@property (nonatomic, readonly) NSString *subtype;
@property (nonatomic, readonly) float rating;
@property (nonatomic, readonly) NSArray<Celebrity *> *casts;

@end

Instead of implementing accessor methods for each property, we can use plm_dynamic macro to generate getter and setter automatically.

@implementation Movie

// Property `identifier` comes from `id` field。
@plm_dynamic(identifier, @"id")

// Property `title` comes from field with same name `title`.
@plm_dynamic(title)

// `year` and `subtype` comes from fields with same names.
@plm_dynamic_multi(year, subtype)

// `rating` comes from `rating.average` keypath. Field value will be transformed to `float` as it's declared.
@plm_dynamic_keypath(rating, @"rating.average")

// `casts` comes from `casts` field. Field value, which is an object array, will be transformed to NSArray with Celebrity instance.
@plm_dynamic(casts, @"casts", PLMArrayTransformerNameForClass([Celebrity class]))

@end

plm_dynamic macro associate property and dictionary field, use NSValueTransformer to transform dictionary value to declared type. See comments in Polymorph.h for detailed usage.

Without inheritance

You can also use Polymorph without extending PLMModel. Conform to PLMRawDataProvider protocol, invoke plm_activate, and you are ready to go.

License

Polymorph is released under BSD license. See LICENSE for more.