Topic and post creating, editing, and deleting

Examples/RKDiscussionBoardExample/DiscussionBoard/Classes/Controllers/DBPostsTableViewController.m

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+//
+//  DBPostsTableViewController.m
+//  DiscussionBoard
+//
+//  Created by Jeremy Ellison on 1/7/11.
+//  Copyright 2011 __MyCompanyName__. All rights reserved.
+//
+
+#import "DBPostsTableViewController.h"
+#import "DBPost.h"
+#import <RestKit/Three20/Three20.h>
+#import "DBUser.h"
+
+@implementation DBPostsTableViewController
+
+- (id)initWithTopicID:(NSString*)topicID {
+	if (self = [super initWithStyle:UITableViewStylePlain]) {
+		_topicID = [topicID retain];
+		
+		self.title = @"Posts";
+		_resourcePath = [[NSString stringWithFormat:@"/topics/%@/posts", _topicID] retain];
+		_resourceClass = [DBPost class];
+	}
+	return self;
+}
+
+- (void)dealloc {
+	[_topicID release];
+	[super dealloc];
+}
+
+- (void)loadView {
+	[super loadView];
+	self.variableHeightRows = YES;
+	
+	UIBarButtonItem* newItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addButtonWasPressed:)] autorelease];
+	self.navigationItem.rightBarButtonItem = newItem;
+}
+
+- (void)addButtonWasPressed:(id)sender {
+	NSString* url = [NSString stringWithFormat:@"db://topics/%@/posts/new", _topicID];
+	TTOpenURL(url);
+}
+
+- (void)createModel {
+	if (nil == [DBTopic objectWithPrimaryKeyValue:_topicID]) {
+		// this topic was deleted or something.
+		[self.navigationController popToRootViewControllerAnimated:YES];
+		return;
+	}
+	[super createModel];
+}
+
+- (void)didLoadModel:(BOOL)firstTime {
+	[super didLoadModel:firstTime];
+	if ([self.model isKindOfClass:[RKRequestTTModel class]]) {
+		RKRequestTTModel* model = (RKRequestTTModel*)self.model;
+		NSMutableArray* postItems = [NSMutableArray arrayWithCapacity:[model.objects count]];
+		NSMutableArray* topicItems = [NSMutableArray arrayWithCapacity:2];
+		
+		[topicItems addObject:[TTTableTextItem itemWithText:self.topic.name]];
+		// only add edit item if there is no current user (lazy login) or
+		// the current user id == topic user id.
+		NSNumber* topicUserId = self.topic.userID;
+		// if topicUserId is nil, the topic has no user for some reason (perhaps they got deleted).
+		if ([DBUser currentUser] == nil || 
+			(topicUserId && [[DBUser currentUser].userID isEqualToNumber:topicUserId])) {
+			NSString* editURL = [NSString stringWithFormat:@"db://topics/%@/edit", _topicID];
+			[topicItems addObject:[TTTableTextItem itemWithText:@"Edit" URL:editURL]];
+		}
+		
+		for(DBPost* post in model.objects) {
+			NSString* url = [NSString stringWithFormat:@"db://posts/%@", post.postID];
+			[postItems addObject:[TTTableLongTextItem itemWithText:post.body URL:url]];
+		}
+		
+		self.dataSource = [TTSectionedDataSource dataSourceWithArrays:@"Topic",
+																	  topicItems,
+																	  @"Posts",
+																	  postItems, nil];
+	}
+}
+
+- (DBTopic*)topic {
+	return [DBTopic objectWithPrimaryKeyValue:_topicID];
+}
+
+@end