FINAL

.gitignore

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+# Xcode
+.DS_Store
+*/build/*
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+*.xcworkspace
+!default.xcworkspace
+xcuserdata
+profile
+*.moved-aside
+DerivedData
+.idea/
+*.hmap

HabraReader/Author+Create.h

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+//
+//  Author+Create.h
+//  HabraReader Prototype
+//
+//  Created by Sergey on 04.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import "Author.h"
+
+@interface Author (Create)
+
+- (NSString *)description;
+
++ (Author *)authorWithName:(NSString *)name inManagedObjectContext:(NSManagedObjectContext *)context;
+
+@end

HabraReader/Author+Create.m

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+//
+//  Author+Create.m
+//  HabraReader Prototype
+//
+//  Created by Sergey on 04.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import "Author+Create.h"
+
+@implementation Author (Create)
+
+- (NSString *)description {
+    return self.nickName;
+}
+
++ (Author *)authorWithName:(NSString *)name inManagedObjectContext:(NSManagedObjectContext *)context {
+
+    Author *author = nil;
+
+    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Author"];
+    request.predicate = [NSPredicate predicateWithFormat:@"nickName = %@", name];
+    NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"nickName" ascending:YES];
+    request.sortDescriptors = @[sortDescriptor];
+
+    NSError *error = nil;
+    NSArray *authors = [context executeFetchRequest:request error:&error];
+
+    if (!authors || ([authors count] > 1)) {
+        // TODO: handle error
+    } else if (![authors count]) {
+        author = [NSEntityDescription insertNewObjectForEntityForName:@"Author" inManagedObjectContext:context];
+        author.nickName = name;
+    } else {
+        author = [authors lastObject];
+    }
+
+    return author;
+}
+
+@end

HabraReader/Author.h

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+//
+//  Author.h
+//  HabraReader
+//
+//  Created by Sergey on 09.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <CoreData/CoreData.h>
+
+@class Comment, Post;
+
+@interface Author : NSManagedObject
+
+@property (nonatomic, retain) NSString * nickName;
+@property (nonatomic, retain) NSSet *comments;
+@property (nonatomic, retain) NSSet *posts;
+@end
+
+@interface Author (CoreDataGeneratedAccessors)
+
+- (void)addCommentsObject:(Comment *)value;
+- (void)removeCommentsObject:(Comment *)value;
+- (void)addComments:(NSSet *)values;
+- (void)removeComments:(NSSet *)values;
+
+- (void)addPostsObject:(Post *)value;
+- (void)removePostsObject:(Post *)value;
+- (void)addPosts:(NSSet *)values;
+- (void)removePosts:(NSSet *)values;
+
+@end

HabraReader/Author.m

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+//
+//  Author.m
+//  HabraReader
+//
+//  Created by Sergey on 09.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import "Author.h"
+#import "Comment.h"
+#import "Post.h"
+
+
+@implementation Author
+
+@dynamic nickName;
+@dynamic comments;
+@dynamic posts;
+
+@end

HabraReader/Comment+Description.h

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+//
+//  Comment+Description.h
+//  HabraReader
+//
+//  Created by Sergey Starukhin on 22.12.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import "Comment.h"
+
+@interface Comment (Description)
+
+- (NSString *)description;
+
+@end

HabraReader/Comment+Description.m

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+//
+//  Comment+Description.m
+//  HabraReader
+//
+//  Created by Sergey Starukhin on 22.12.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import "Comment+Description.h"
+
+@implementation Comment (Description)
+
+- (NSString *)description {
+    return [NSString stringWithFormat:@"%@, %@\n\n%@", self.author, self.publicationDate, self.content];
+}
+
+@end

HabraReader/Comment.h

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+//
+//  Comment.h
+//  HabraReader
+//
+//  Created by Sergey on 09.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <CoreData/CoreData.h>
+#import "Message.h"
+
+@class Author, Message;
+
+@interface Comment : Message
+
+@property (nonatomic) BOOL isRead;
+@property (nonatomic, retain) Author *author;
+@property (nonatomic, retain) Message *replyTo;
+
+@end

HabraReader/Comment.m

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+//
+//  Comment.m
+//  HabraReader
+//
+//  Created by Sergey on 09.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import "Comment.h"
+#import "Author.h"
+#import "Message.h"
+
+
+@implementation Comment
+
+@dynamic isRead;
+@dynamic author;
+@dynamic replyTo;
+
+@end

HabraReader/Company+Create.h

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+//
+//  Company+Create.h
+//  HabraReader Prototype
+//
+//  Created by Sergey on 04.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import "Company.h"
+
+@interface Company (Create)
+
++ (Company *)companyWithName:(NSString *)name inManagedObjectContext:(NSManagedObjectContext *)context;
+
+@end

HabraReader/Company+Create.m

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+//
+//  Company+Create.m
+//  HabraReader Prototype
+//
+//  Created by Sergey on 04.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import "Company+Create.h"
+
+@implementation Company (Create)
+
++ (Company *)companyWithName:(NSString *)name inManagedObjectContext:(NSManagedObjectContext *)context {
+
+    Company *company = nil;
+
+    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:NSStringFromClass(self)];
+    request.predicate = [NSPredicate predicateWithFormat:@"name = %@", name];
+    NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
+    request.sortDescriptors = @[sortDescriptor];
+
+    NSError *error = nil;
+    NSArray *companies = [context executeFetchRequest:request error:&error];
+
+    if (!companies || ([companies count] > 1)) {
+        // TODO: handle error
+    } else if (![companies count]) {
+        company = [NSEntityDescription insertNewObjectForEntityForName:NSStringFromClass(self) inManagedObjectContext:context];
+        company.name = name;
+    } else {
+        company = [companies lastObject];
+    }
+
+    return company;
+}
+
+@end

HabraReader/Company.h

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+//
+//  Company.h
+//  HabraReader
+//
+//  Created by Sergey on 09.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <CoreData/CoreData.h>
+#import "GenericHub.h"
+
+
+@interface Company : GenericHub
+
+
+@end

HabraReader/Company.m

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+//
+//  Company.m
+//  HabraReader
+//
+//  Created by Sergey on 09.10.12.
+//  Copyright (c) 2012 Sergey Starukhin. All rights reserved.
+//
+
+#import "Company.h"
+
+
+@implementation Company
+
+
+@end

HabraReader/CoreDataTableViewController.h

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+//
+//  CoreDataTableViewController.h
+//
+//  Created for Stanford CS193p Fall 2011.
+//  Copyright 2011 Stanford University. All rights reserved.
+//
+// This class mostly just copies the code from NSFetchedResultsController's documentation page
+//   into a subclass of UITableViewController.
+//
+// Just subclass this and set the fetchedResultsController.
+// The only UITableViewDataSource method you'll HAVE to implement is tableView:cellForRowAtIndexPath:.
+// And you can use the NSFetchedResultsController method objectAtIndexPath: to do it.
+//
+// Remember that once you create an NSFetchedResultsController, you CANNOT modify its @propertys.
+// If you want new fetch parameters (predicate, sorting, etc.),
+//  create a NEW NSFetchedResultsController and set this class's fetchedResultsController @property again.
+//
+
+#import <UIKit/UIKit.h>
+#import <CoreData/CoreData.h>
+
+@interface CoreDataTableViewController : UITableViewController <NSFetchedResultsControllerDelegate>
+
+// The controller (this class fetches nothing if this is not set).
+@property (strong, nonatomic) NSFetchedResultsController *fetchedResultsController;
+
+// Causes the fetchedResultsController to refetch the data.
+// You almost certainly never need to call this.
+// The NSFetchedResultsController class observes the context
+//  (so if the objects in the context change, you do not need to call performFetch
+//   since the NSFetchedResultsController will notice and update the table automatically).
+// This will also automatically be called if you change the fetchedResultsController @property.
+- (void)performFetch;
+
+// Turn this on before making any changes in the managed object context that
+//  are a one-for-one result of the user manipulating rows directly in the table view.
+// Such changes cause the context to report them (after a brief delay),
+//  and normally our fetchedResultsController would then try to update the table,
+//  but that is unnecessary because the changes were made in the table already (by the user)
+//  so the fetchedResultsController has nothing to do and needs to ignore those reports.
+// Turn this back off after the user has finished the change.
+// Note that the effect of setting this to NO actually gets delayed slightly
+//  so as to ignore previously-posted, but not-yet-processed context-changed notifications,
+//  therefore it is fine to set this to YES at the beginning of, e.g., tableView:moveRowAtIndexPath:toIndexPath:,
+//  and then set it back to NO at the end of your implementation of that method.
+// It is not necessary (in fact, not desirable) to set this during row deletion or insertion
+//  (but definitely for row moves).
+@property (nonatomic) BOOL suspendAutomaticTrackingOfChangesInManagedObjectContext;
+
+// Set to YES to get some debugging output in the console.
+@property BOOL debug;
+
+@end