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Ruby on Rails Callback, what is difference between :before_save and :before_create?
... read update instead of create everywhere (and UPDATE instead of INSERT).
From this, you can see that validation is carried out before the before_save and before_create callbacks.
The before_save occurs slightly before the before_create. To the best of my knowledge, nothing happens between them; ...
How does Chrome's “Request Desktop Site” option work?
...if you "Request desktop site" it will change the User-Agent and re-request from somesite.com
Unless: you had gone directly in on the mobile URL of somesite.com/m in the first place, in which case it just reloads somesite.com/m.
I would expect that this works with HTTP 301 and 302 redirects, I know...
Debug Error \"pure virtual function call\" 原因解析 - 更多技术 - 清泛...
...抛出异常！"，就像Scott同学说的：Item 11: Prevent exceptions from leaving destructors；就像C++ FAQ中说的：Never throw an exception from a destructor.
虽然，也有人站出来说，there is nothing wrong with throwing destructors，但我还是支持你的观点，我们的确...
Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar
...
I used the following psd that I derived from http://www.teehanlax.com/blog/?p=447
http://www.chrisandtennille.com/pictures/backbutton.psd
I then just created a custom UIView that I use in the customView property of the toolbar item.
Works well for me.
Edit: A...
are there dictionaries in javascript like python?
...
If the value comes from the user, then care needs to be taken to use Object.hasOwnProperty.call(dictionary, key) (otherwise the user can enter a value of valueOf and dictionary['valueOf'] returns the Object.valueOf() function belonging to the O...
C++ const map element access
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Does the C++ standard forbid the implementation from defining additional non-standard member functions in library classes?
– Tim Martin
Feb 27 '11 at 17:31
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Testing Abstract Classes
... stubs and mock objects to help you testing this kind of things.
Straight from PHPUnit manual:
abstract class AbstractClass
{
public function concreteMethod()
{
return $this->abstractMethod();
}
public abstract function abstractMethod();
}
class AbstractClassTest exten...
Sending email through Gmail SMTP server with C#
...ord is too weak" and wouldn't let me go back to my old password. I figured from this that it was erroring out because either a) you need to change your password once every x amount of months or b). as I said before, their password strength algorithms changed and therefore the weak password i had was...
How do I detect unsigned integer multiply overflow?
...tegers mod 2^32 (or 2^64). The distinction between overflow as a deviation from mathematical infinite-sized integer behaviour, and overflow as an undefined behaviour in the language seems rarely to be made explicit.
– Chris Johnson
Oct 3 '09 at 18:47
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How to handle multiple heterogeneous inputs with Logstash?
.... Deprecated settings will continue to work, but are scheduled for removal from logstash in the future. You can achieve this same behavior with the new conditionals, like: if [type] == "sometype" { stdout { ... } }." I retract my previous comment. :)
– Tony Cesaro
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