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NSFetchRequest *fetchRequest = [TGRTweet fetchRequestForAllTweets];
NSArray *tweets = [self.managedObjectContext executeFetchRequest:fetchRequest error:NULL];

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@interface TGRManagedObject : NSManagedObject

+ (NSString *)entityName;
+ (NSFetchRequest *)fetchRequest;

+ (id)insertNewObjectInManagedObjectContext:(NSManagedObjectContext *)context;
+ (id)importFromDictionary:(NSDictionary *)dictionary inManagedObjectContext:(NSManagedObjectContext *)context;

- (void)importValuesFromDictionary:(NSDictionary *)dictionary;

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+ (NSString *)entityName
{
    return NSStringFromClass([self class]);
}

+ (NSFetchRequest *)fetchRequest
{
    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:[self entityName]];
    [fetchRequest setFetchBatchSize:25];
    

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#import "TGRManagedObject.h"

@class TGRTweet;

@interface TGRTwitterUser : TGRManagedObject
...

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+ (NSFetchRequest *)fetchRequestForTwitterUserWithIdentifier:(NSNumber *)identifier;

+ (id)twitterUserWithIdentifier:(NSNumber *)identifier
         inManagedObjectContext:(NSManagedObjectContext *)context;

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+ (NSFetchRequest *)fetchRequestForTwitterUserWithIdentifier:(NSNumber *)identifier
{
    static dispatch_once_t onceToken;
    static NSPredicate *predicateTemplate;
    
    dispatch_once(&onceToken, ^{
        predicateTemplate = [NSPredicate predicateWithFormat:@"identifier == $IDENTIFIER"];
    });
    
    NSPredicate *predicate = [predicateTemplate predicateWithSubstitutionVariables:

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+ (id)twitterUserWithIdentifier:(NSNumber *)identifier inManagedObjectContext:(NSManagedObjectContext *)context
{
    NSFetchRequest *fetchRequest = [self fetchRequestForTwitterUserWithIdentifier:identifier];
    return [[context executeFetchRequest:fetchRequest error:NULL] lastObject];
}

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- (void)importValuesFromDictionary:(NSDictionary *)dictionary
{
    self.identifier = dictionary[@"id"];
    self.name = dictionary[@"name"];
    self.screenName = dictionary[@"screen_name"];
    self.imageLink = dictionary[@"profile_image_url"];
}

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#import "TGRManagedObject.h"

@class TGRTwitterUser;

@interface TGRTweet : TGRManagedObject
...

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+ (NSFetchRequest *)fetchRequestForAllTweets;

+ (id)firstTweetInManagedObjectContext:(NSManagedObjectContext *)context;
+ (id)lastTweetInManagedObjectContext:(NSManagedObjectContext *)context;