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git log --all -p file_path

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        // remove stuff from core data before fetching again
        RKObjectManager *sharedObjectManager = [RKObjectManager sharedManager];
        NSError *err = nil;
        [sharedObjectManager.managedObjectStore resetPersistentStores:&err];
        
        self.searchCollectionView.hidden = YES;
        self.fetchedResultsController = nil;
        [self.searchCollectionView reloadData];

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- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *kStandardCellID = @"StandardCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kStandardCellID];
    
    if (cell.accessoryView == nil) {
        // Only configure the Checkbox control once.
        cell.accessoryView = [[Checkbox alloc] initWithFrame:CGRectMake(0, 0, 25, 43)];
        cell.accessoryView.opaque = NO;
        cell.backgroundColor = [UIColor clearColor];

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subl `bundle show sitemap_generator`

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testing -> code -> testing -> code ....

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http://stackoverflow.com/questions/2894321/how-to-access-the-price-of-a-product-in-skpayment

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// 原代码块一
self.indicator.hidden = NO;
[self.indicator startAnimating];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    // 原代码块二
    NSURL * url = [NSURL URLWithString:@"http://www.youdao.com"];
    NSError * error;
    NSString * data = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];
    if (data != nil) {
        // 原代码块三

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self.tableView.tableFooterView = [[UIView alloc] init];

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 bundle exec rails c production
 tail -f production.log

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http://tech.glowing.com/cn/practice-in-uiscrollview/