Adding tons of introspection code to parse attributes.

BDKUntappd.podspec

@@ -12,13 +12,13 @@ Pod::Spec.new do |s|
   s.osx.deployment_target = '10.8'
   s.requires_arc = true
 
-  s.source_files = 'Classes'
-  s.resources = 'Assets'
-
+  s.source_files = 'Classes/**/*.{h,m}'
+  # s.resources = 'Assets'
   s.ios.exclude_files = 'Classes/osx'
   s.osx.exclude_files = 'Classes/ios'
   # s.public_header_files = 'Classes/**/*.h'
   # s.frameworks = 'SomeFramework', 'AnotherFramework'
   s.dependency 'AFNetworking/Serialization', '>= 2.0.0'
   s.dependency 'AFNetworking/NSURLSession', '>= 2.0.0'
+  s.dependency 'TransformerKit'
 end

Classes/BDKUntappd.m

@@ -7,6 +7,8 @@
 
 #import "BDKUntappd.h"
 
+#import "BDKUntappdModels.h"
+
 NSString * const BDKUntappdBaseURL = @"http://api.untappd.com/v4";
 NSString * const BDKUntappdAuthenticateURL = @"https://untappd.com/oauth/authenticate";
 NSString * const BDKUntappdAuthorizeURL = @"https://untappd.com/oauth/authorize";
@@ -71,7 +73,12 @@ - (void)checkinsForUser:(NSString *)username completion:(BDKUntappdResultBlock)c
 
     NSString *url = [NSString stringWithFormat:@"/v4/user/checkins%@%@", username ? @"/" : @"", username ?: @""];
     [self GET:url parameters:[self authorizationParams] success:^(NSURLSessionDataTask *task, id responseObject) {
-        completion(responseObject, nil);
+        NSMutableArray *checkins = [NSMutableArray array];
+        [responseObject[@"response"][@"checkins"][@"items"] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
+            BDKUntappdCheckin *checkin = [BDKUntappdCheckin modelWithDictionary:obj];
+            [checkins addObject:checkin];
+        }];
+        completion(checkins, nil);
     } failure:^(NSURLSessionDataTask *task, NSError *error) {
         completion(nil, error);
     }];

Classes/BDKUntappdCheckin.h

@@ -0,0 +1,24 @@
+//
+//  BDKUntappdCheckin.h
+//
+//  Created by Ben Kreeger on 3/4/14.
+//  Copyright (c) 2014 Ben Kreeger. All rights reserved.
+//
+
+#import "BDKUntappdModel.h"
+
+@interface BDKUntappdCheckin : BDKUntappdModel
+
+@property (strong, nonatomic) NSArray *badges;
+@property (strong, nonatomic) NSDictionary *beer;
+@property (strong, nonatomic) NSDictionary *brewery;
+@property (strong, nonatomic) NSArray *comments;
+@property (strong, nonatomic) NSDate *createdAt;
+@property (strong, nonatomic) NSArray *media;
+@property (strong, nonatomic) NSNumber *ratingScore;
+@property (strong, nonatomic) NSDictionary *source;
+@property (strong, nonatomic) NSArray *toasts;
+@property (strong, nonatomic) NSDictionary *user;
+@property (strong, nonatomic) NSDictionary *venue;
+
+@end

Classes/BDKUntappdCheckin.m

@@ -0,0 +1,18 @@
+//
+//  BDKUntappdCheckin.h
+//
+//  Created by Ben Kreeger on 3/4/14.
+//  Copyright (c) 2014 Ben Kreeger. All rights reserved.
+//
+
+#import "BDKUntappdCheckin.h"
+
+@implementation BDKUntappdCheckin
+
+#pragma mark - BDKUntappdModel
+
+- (NSString *)remoteIdentifierName {
+    return @"checkin_id";
+}
+
+@end

Classes/BDKUntappdModel.h

@@ -0,0 +1,17 @@
+//
+//  BDKUntappdModel.h
+//
+//  Created by Ben Kreeger on 3/4/14.
+//  Copyright (c) 2014 Ben Kreeger. All rights reserved.
+//
+
+@interface BDKUntappdModel : NSObject <NSCoding>
+
+@property (strong, nonatomic) NSString *identifier;
+@property (readonly, strong, nonatomic) NSString *remoteIdentifierName;
+
++ (instancetype)modelWithDictionary:(NSDictionary *)dictionary;
+- (instancetype)initWithDictionary:(NSDictionary *)dictionary;
+- (void)updateWithDictionary:(NSDictionary *)dictionary;
+
+@end

Classes/BDKUntappdModel.m

@@ -0,0 +1,187 @@
+//
+//  BDKUntappdModel.m
+//
+//  Created by Ben Kreeger on 3/4/14.
+//  Copyright (c) 2014 Ben Kreeger. All rights reserved.
+//
+
+#import "BDKUntappdModel.h"
+
+#import "NSObject+BDKUntappd.h"
+
+#import <TransformerKit/TransformerKit.h>
+#import <TransformerKit/NSValueTransformer+TransformerKit.h>
+#import <objc/runtime.h>
+
+// Praise be to Jastor. https://github.com/elado/jastor
+static const char *property_getTypeName(objc_property_t property) {
+	const char *attributes = property_getAttributes(property);
+	char buffer[1 + strlen(attributes)];
+	strcpy(buffer, attributes);
+	char *state = buffer, *attribute;
+	while ((attribute = strsep(&state, ",")) != NULL) {
+		if (attribute[0] == 'T') {
+			size_t len = strlen(attribute);
+			attribute[len - 1] = '\0';
+			return (const char *)[[NSData dataWithBytes:(attribute + 3) length:len - 2] bytes];
+		}
+	}
+	return "@";
+}
+
+@implementation BDKUntappdModel
+
++ (instancetype)modelWithDictionary:(NSDictionary *)dictionary {
+    return [[self alloc] initWithDictionary:dictionary];
+}
+
+- (instancetype)initWithDictionary:(NSDictionary *)dictionary {
+    self = [super init];
+    if (!self) return nil;
+    [self updateWithDictionary:dictionary];
+    return self;
+}
+
+- (void)updateWithDictionary:(NSDictionary *)dictionary {
+    NSArray *properties = [[self class] propertyNamesForClass:[self class]];
+    [properties enumerateObjectsUsingBlock:^(NSString *propertyName, NSUInteger idx, BOOL *stop) {
+        NSString *remoteName = [[self class] remotePropertyNameForLocalPropertyName:propertyName];
+        id val = dictionary[remoteName];
+        if (![val bdk_isPresent]) return;
+        if ([[self class] property:propertyName isReadOnlyForClass:[self class]]) return;
+
+        if ([val isKindOfClass:[NSDictionary class]]) {
+            // Untappd's API has arrays nested in dictionaries with some metadata; this pulls it out and rights it.
+            if (val[@"items"]) {
+                val = val[@"items"];
+            } else {
+                Class klass = [[self class] classForPropertyName:propertyName inClass:[self class]];
+                val = [[klass alloc] initWithDictionary:val];
+            }
+
+        }
+
+        if ([val isKindOfClass:[NSArray class]]) {
+            NSArray *valuesForVal = (NSArray *)val;
+            NSMutableArray *objects = [NSMutableArray arrayWithCapacity:[valuesForVal count]];
+            [valuesForVal enumerateObjectsUsingBlock:^(id subVal, NSUInteger idx, BOOL *stop) {
+                if ([[subVal class] isSubclassOfClass:[NSDictionary class]]) {
+                    SEL classSelector = NSSelectorFromString([NSString stringWithFormat:@"%@_class", propertyName]);
+                    if ([[self class] respondsToSelector:classSelector]) {
+                        Class klass = [[self class] performSelector:classSelector];
+                        if ([klass isSubclassOfClass:[BDKUntappdModel class]]) {
+                            BDKUntappdModel *model = [[klass alloc] initWithDictionary:subVal];
+                            [objects addObject:model];
+                            return;
+                        }
+                    }
+                    [objects addObject:subVal];
+                }
+            }];
+            val = [objects copy];
+
+        }
+
+        [self setValue:val forKey:propertyName];
+    }];
+
+    id identifierValue = [dictionary objectForKey:self.remoteIdentifierName];
+    if ([identifierValue bdk_isPresent]) {
+        if (![identifierValue isKindOfClass:[NSString class]]) {
+            identifierValue = [NSString stringWithFormat:@"%@", identifierValue];
+        }
+        [self setValue:identifierValue forKey:@"identifier"];
+    }
+}
+
+- (void)dealloc {
+    self.identifier = nil;
+}
+
+- (NSString *)description {
+    return [NSString stringWithFormat:@"<%@ %p> { id: %@ }", NSStringFromClass([self class]), self, self.identifier];
+}
+
+#pragma mark - Properties
+
+- (NSString *)remoteIdentifierName {
+    return @"id";
+}
+
+#pragma mark - NSCoding
+
+- (instancetype)initWithCoder:(NSCoder *)aDecoder {
+    self = [super init];
+    if (!self) return nil;
+
+    id decoded = [aDecoder decodeObjectForKey:@"identifier"];
+    [self setValue:decoded forKey:@"identifier"];
+
+    NSArray *propertyNames = [[self class] propertyNamesForClass:[self class]];
+    [propertyNames enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop) {
+        if ([[self class] property:key isReadOnlyForClass:[self class]]) return;
+        id decoded = [aDecoder decodeObjectForKey:key];
+        if (![decoded bdk_isPresent]) return;
+        [self setValue:decoded forKey:key];
+    }];
+    return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+    [aCoder encodeObject:self.identifier forKey:@"identifier"];
+    NSArray *propertyNames = [[self class] propertyNamesForClass:[self class]];
+    [propertyNames enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop) {
+		[aCoder encodeObject:[self valueForKey:key] forKey:key];
+    }];
+}
+
+#pragma mark - Private methods
+
++ (NSArray *)propertyNamesForClass:(Class)klass {
+    if (klass == [BDKUntappdModel class]) {
+        return [NSArray array];
+    }
+
+	int numberOfProperties = 0;
+	objc_property_t *propertyTypes = class_copyPropertyList(klass, &numberOfProperties);
+
+	NSMutableArray *propertyList = [NSMutableArray arrayWithCapacity:numberOfProperties];
+	for (int idx = 0; idx < numberOfProperties; idx++) {
+		objc_property_t property = propertyTypes[idx];
+		[propertyList addObject:[NSString stringWithUTF8String:property_getName(property)]];
+	}
+
+	free(propertyTypes);
+    return propertyList;
+}
+
++ (NSString *)remotePropertyNameForLocalPropertyName:(NSString *)localPropertyName {
+    NSString *unLlamad = [[NSValueTransformer valueTransformerForName:TTTLlamaCaseStringTransformerName]
+                          reverseTransformedValue:localPropertyName];
+    return [[NSValueTransformer valueTransformerForName:TTTTrainCaseStringTransformerName] transformedValue:unLlamad];
+}
+
++ (BOOL)property:(NSString *)propertyName isReadOnlyForClass:(Class)klass {
+    const char *type = property_getAttributes(class_getProperty(klass, [propertyName UTF8String]));
+    NSString *typeAttribute = [[[NSString stringWithUTF8String:type] componentsSeparatedByString:@","] objectAtIndex:1];
+    return [typeAttribute rangeOfString:@"R"].length > 0;
+}
+
++ (Class)classForPropertyName:(NSString *)propertyName inClass:(Class)klass {
+	int numberOfProperties = 0;
+	objc_property_t *propertyTypes = class_copyPropertyList(klass, &numberOfProperties);
+	const char *cPropertyName = [propertyName UTF8String];
+
+	for (int idx = 0; idx < numberOfProperties; idx++) {
+		objc_property_t property = propertyTypes[idx];
+		if (strcmp(cPropertyName, property_getName(property)) == 0) {
+			free(propertyTypes);
+			return NSClassFromString([NSString stringWithUTF8String:property_getTypeName(property)]);
+		}
+	}
+
+    free(propertyTypes);
+	return [self classForPropertyName:propertyName inClass:class_getSuperclass(klass)];
+}
+
+@end

Classes/BDKUntappdModels.h

@@ -0,0 +1,2 @@
+#import "BDKUntappdModel.h"
+#import "BDKUntappdCheckin.h"

Classes/Categories/NSObject+BDKUntappd.h

@@ -0,0 +1,12 @@
+//
+//  NSObject+BDKUntappd.h
+//
+//  Created by Ben Kreeger on 3/5/14.
+//  Copyright (c) 2014 Ben Kreeger. All rights reserved.
+//
+
+@interface NSObject (BDKUntappd)
+
+- (BOOL)bdk_isPresent;
+
+@end

Classes/Categories/NSObject+BDKUntappd.m

@@ -0,0 +1,16 @@
+//
+//  NSObject+BDKUntappd.m
+//
+//  Created by Ben Kreeger on 3/5/14.
+//  Copyright (c) 2014 Ben Kreeger. All rights reserved.
+//
+
+#import "NSObject+BDKUntappd.h"
+
+@implementation NSObject (BDKUntappd)
+
+- (BOOL)bdk_isPresent {
+    return ![self isEqual:[NSNull null]];
+}
+
+@end

Project/Podfile.lock

@@ -11,6 +11,8 @@ PODS:
   - BDKUntappd (0.1.0):
     - AFNetworking/NSURLSession (>= 2.0.0)
     - AFNetworking/Serialization (>= 2.0.0)
+    - TransformerKit
+  - TransformerKit (0.3.1)
 
 DEPENDENCIES:
   - BDKUntappd (from `../BDKUntappd.podspec`)
@@ -21,6 +23,7 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   AFNetworking: e8cfd8f3fe3bfe19124a0cc63f4d45752d892a56
-  BDKUntappd: f904c5255674ad5ff6260be467db8d08075c8af9
+  BDKUntappd: 527ef70470c6071031237e38b2d89db2928fa1b4
+  TransformerKit: 612d3966b31e345f2abc8221fe6657379bb5d8b6
 
 COCOAPODS: 0.29.0