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Rails detect if request was AJAX

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How to delete a whole folder and content?

...er. You can delete its contents by using the method below: Updated as per comments File dir = new File(Environment.getExternalStorageDirectory()+"Dir_name_here"); if (dir.isDirectory()) { String[] children = dir.list(); for (int i = 0; i < children.length; i++) { new File(d...
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WPF: How to display an image at its original size?

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How do I set a conditional breakpoint in gdb, when char* x points to a string whose value equals “he

...ynamic libraries get loaded. For source, google it and find: stackoverflow.com/questions/10000335/… :-) – Ciro Santilli 郝海东冠状病六四事件法轮功 Nov 13 '15 at 9:52 ...
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Validate uniqueness of multiple columns

... In Rails 4, this becomes: validates :user_id, uniqueness: {scope: :friend_id} – Marina Martin Jan 26 '14 at 18:36 ...
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Java unchecked: unchecked generic array creation for varargs parameter

...eation of an array at the calling site. So List<List<String>> combinations = Utils.createCombinations(cocNumbers, vatNumbers, ibans); is actually List<List<String>> combinations = Utils.createCombinations(new List<String>[]{cocNumbers, vatNumbers, ibans}); ...
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How does Activity.finish() work in Android?

... Does it exits immediately or completes the function from which it was called ? The method that called finish() will run to completion. The finish() operation will not even begin until you return control to Android. ...
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How to change the decimal separator of DecimalFormat from comma to dot/point?

...looks like, e.g. String formatString = "#,###,###,##0.00"; see docs.oracle.com/javase/7/docs/api/java/text/DecimalFormat.html for syntax – Vulpo Mar 31 '16 at 13:55 ...
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How to open a web server port on EC2 instance

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Visual Studio setup problem - 'A problem has been encountered while loading the setup components. Ca

...er-so-useful error 'A problem has been encountered while loading the setup components. Canceling setup.' whenever I try to uninstall, reinstall or repair Visual Studio 2008 (team system version). If I can't resolve this issue I have no choice but to completely wipe my computer and start again which ...