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Rails migration for has_and_belongs_to_many join table

... One example is if the relationship is important enough to have a view. It can also be used to speed up accessing the databas by passing around the relationship.id instead of looking it up repeatedly. It also makes troublesh...
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How to check if a file is a valid image file?

... Your answer is actually better, thanks. Like someone above said ...but solving a problem 99% of the way is often better then not solving it at all.. – RinkyPinku Jun 3 '15 at 11:54 ...
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How can I set the color of a selected row in DataGrid

... Finally found the one if it doesn't have Focus: SystemColors.ControlBrushKey. – Rolfi May 16 '13 at 6:43 ...
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Does Android keep the .apk files? if so where?

...ions are in /data/app. I guess you can't access unless you have a rooted phone. I don't have a rooted phone here but try this code out: public class Testing extends Activity { private static final String TAG = "TEST"; @Override public void onCreate(Bundle savedInstanceState) { s...
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CSS transition effect makes image blurry / moves image 1px, in Chrome?

... Can someone confirm if this still work, because whenever I add ` -webkit-backface-visibility` and -webkit-transform, I can't really see a change, and when I open chromes developer console. I see those 2 css properties are stroked thr...
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Copy a variable's value into another

...e any arbitrary object, you can use an object cloning function such as the one listed in Armand's answer, or since you're using jQuery just use the $.extend() function. This function will make either a shallow copy or a deep copy of an object. (Don't confuse this with the $().clone() method which is...
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Bring a window to the front in WPF

... Actually it can be done with this: if (myWindow.WindowState == WindowState.Minimized) myWindow.WindowState = WindowState.Normal; Oddly it will also preserve any Maximized windows and not revert them to a Normal state. –...
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Best way to iterate through a Perl array

...you'll find #1 and #4 to be slightly faster because the iteration work is done in C instead of Perl, and no needless copying of the array elements occurs. ($_ is aliased to the element in #1, but #2 and #3 actually copy the scalars from the array.) #5 might be similar. In terms memory usage: They'r...
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What does it mean: The serializable class does not declare a static final serialVersionUID field? [d

... You can also let your IDE to autogenerate one. – BalusC Feb 18 '10 at 14:08 4 ...
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How to pass prepareForSegue: an object

... This is one of the most thorough answers I've ever seen. Good code samples, solves the issue, offers downloadable sample... wow. I'm impressed! – lewiguez Jun 17 '12 at 3:14 ...