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Rails “validates_uniqueness_of” Case Sensitivity
...
Process B does the same thing
Process A validates the uniqueness of 'foo' by asking the DB if that name exists yet and the DB says the name doesn't exist yet.
Process B does the same thing and gets the same response
Process A submits the insert statement for the new record and succeeds
If you have ...
How can I enable or disable the GPS programmatically on Android?
...
the GPS can be toggled by exploiting a bug in the power manager widget. see this xda thread for discussion.
here's some example code i use
private void turnGPSOn(){
String provider = Settings.Secure.getString(getContentResolver(), Settings.Se...
GCC -fPIC option
...loaded to.
In the above example, the "111" in the non-PIC code is written by the loader the first time it was loaded.
For not shared objects, you may want it to be like that because the compiler can make some optimizations on that code.
For shared object, if another process will want to "link" to...
How can I get the full object in Node.js's console.log(), rather than '[Object]'?
...fault without allowing you to change it); console.dir() has the same limit by default, but you can pass in an options object as the 2nd argument to change that (which is passed through to util.inspect(); note that console.dir() can only ever print 1 object at a time, however. To print with unlimite...
Is it safe to parse a /proc/ file?
...quite different than having an ordinary file on disk that is being changed by the kernel.
All the kernel does is print its internal state into its own memory using a sprintf-like function, and that memory is copied into userspace whenever you issue a read(2) system call.
The kernel handles these c...
Chrome Dev Tools: How to trace network for a link that opens a new tab?
... log' on the 'Network' tab:
and force all links to open in the same tab by executing the following code in the console:
[].forEach.call(document.querySelectorAll('a'),
function(link){
if(link.attributes.target) {
link.attributes.target.value = '_self';
}
});
...
String vs. StringBuilder
...o another thread), a good optimizer could determine that a is not accessed by any other code during this sequence of lines; only the final value of a matters. So it could treat those three lines of code as if they were written a = b + c + d;.
– ToolmakerSteve
N...
What is the difference between `raise “foo”` and `raise Exception.new(“foo”)`?
...e is that although you can raise any type of object, the blank rescue will by default only catch anything that inherits from StandardError. Everything else has to be specific.
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How do I rename a repository on GitHub?
... existing local clones to point to the new repository URL. You can do this by using git remote on the command line:
git remote set-url origin new_url
Beware though:
GitHub Pages sites are not automatically redirected when their repositories are renamed at this time.
Renaming a Pages repository wi...
What is the correct SQL type to store a .Net Timespan with values > 24:00:00?
...-01' date doesn't matter, of course, it's just the third variable required by the DATEADD(...) function. Remember there are 100 nanoseconds in a tick, but if you use DATEADD(NANOSECOND... you're likely to get an overflow, hence using milliseconds. Also remember that you should check this fact using ...