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Index on multiple columns in Ruby on Rails
...ut checking uniqueness at validation time vs. on index: the latter is done by database while the primer is done by the model. Since there might be several concurrent instances of a model running at the same time, the validation is subject to race conditions, which means it might fail to detect dupli...
val-mutable versus var-immutable in Scala
...method. If the method is short, even better. If it isn't, try to reduce it by extracting other methods.
On the other hand, a mutable collection has the potential to escape, even if it doesn't. When changing code, you might then want to pass it to other methods, or return it. That's the kind of thin...
Why is Android Studio reporting “URI is not registered”? [closed]
...oject root>\<project name>\build\res\all\debug\layout (it is open by default I think, and being used to working from top to bottom I guess that explains the confusion). Instead, one should indeed look at <project root>\<project name>\src\main\res\layout.
– ...
Android Studio - local path doesn't exist
...e.org/distributions/gradle-1.11-all.zip
3.Sync project with gradle files by pressing the button to the left of the avd button
4.Try to build project again. If still having issues possibly try File > Invalidate Caches/Restart
NOTE: If you are using 0.9.+ and it gives Could not GET 'http://re...
What is more efficient? Using pow to square or just multiply it with itself?
...logy in my testing is correct.)
This is in response to the comment made by An Markm:
Even if a using namespace std directive was issued, if the second parameter to pow is an int, then the std::pow(double, int) overload from <cmath> will be called instead of ::pow(double, double) from <m...
How can I extract embedded fonts from a PDF as valid font files?
...'m aware of the pdftk.exe utility that can indicate which fonts are used by a PDF, and wether they are embedded or not.
8...
HTML/CSS: Make a div “invisible” to clicks?
...
It can be done by refiring the event after you temporarily hide the overlay.
See the first answer to this question:
HTML "overlay" which allows clicks to fall through to elements behind it
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jQuery returning “parsererror” for ajax request
...om the object literal...
Method Two
Or you can do what @Sagiv was saying by returning your data as Json.
The reason why this parsererror message occurs is that when you simply return a string or another value, it is not really Json, so the parser fails when parsing it.
So if you remove the dat...
scrollIntoView Scrolls just too far
...iv's scroll offset like that:
el.scrollIntoView(true);
document.getElementById("containingDiv").scrollTop -= 10;
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How can I make setuptools install a package that's not on PyPI?
... http://github.com/mtai/python-gearman/tarball/master. However, that link by itself won't work, because easy_install can't tell just by looking at the URL what it's going to get.
By changing it to http://github.com/mtai/python-gearman/tarball/master#egg=gearman-2.0.0beta instead, easy_install will...