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Rails :dependent => :destroy VS :dependent => :delete_all
...te_all is made directly in your application and deletes by SQL :
DELETE * FROM users where compagny_id = XXXX
With the :destroy, there is an instantiation of all of your children. So, if you can't destroy it or if each has their own :dependent, its callbacks can be called.
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JSON and XML comparison [closed]
... little background:
edit: I should mention that this comparison is really from the perspective of using them in a browser with JavaScript. It's not the way either data format has to be used, and there are plenty of good parsers which will change the details to make what I'm saying not quite valid.
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using jquery $.ajax to call a PHP function
... basically put that PHP script inside a function and call the PHP function from javascript.
6 Answers
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Should one use < or
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I remember from my days when we did 8086 Assembly at college it was more performant to do:
for (int i = 6; i > -1; i--)
as there was a JNS operation that means Jump if No Sign. Using this meant that there was no memory lookup afte...
Understanding FFT output
...ioned by you in point 1) is, in general? In my case, on a signal of values from an accelerometer (is m/s^2). I can't quite figure it out.
– Markus Wüstenberg
Jan 27 '14 at 17:19
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C++11 std::threads vs posix threads
...ement is boost::thread - it is very similar to std::thread (actually it is from the same author) and works reliably, but, of course, it introduces another dependency from a third party library.
Edit: As of 2017, std::thread mostly works on native Android. Some classes, like std::timed_mutex are s...
Is git good with binary files?
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From the git community book (book.git-scm.com/7_how_git_stores_objects.html): "In order to save that space, Git utilizes the packfile. This is a format where Git will only save the part that has changed in the second file, wi...
java.sql.SQLException: Incorrect string value: '\xF0\x9F\x91\xBD\xF0\x9F…'
...orry about converting characters or
losing data when upgrading utf8 data from older versions of MySQL.
So to support these characters, your MySQL needs to be 5.5+ and you need to use utf8mb4 everywhere. Connection encoding needs to be utf8mb4, character set needs to be utf8mb4 and collaction nee...
Can “using” with more than one resource cause a resource leak?
C# lets me do the following (example from MSDN):
5 Answers
5
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Task continuation on UI thread
...standard' way to specify that a task continuation should run on the thread from which the initial task was created?
5 Answe...