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Best way to create unique token in Rails?
...safe random token and ensuring it's uniqueness for the model (when using Ruby 1.9 and ActiveRecord):
class ModelName < ActiveRecord::Base
before_create :generate_token
protected
def generate_token
self.token = loop do
random_token = SecureRandom.urlsafe_base64(nil, false)
...
Coalesce function for PHP?
..... if you are thinking of squeezing this millisecond of performance or few bytes of memory out of your application you're probably looking at the wrong performance/memory bottleneck
– ChrisR
Mar 26 '10 at 13:53
...
MVC3 DropDownListFor - a simple example?
...elect list constructor is a selected value - The last parameter is ignored by the method (which internally builds its own SelectList). Its the value of the property (ContribType) which determines what is selected (that's how model binding works) and the code should just be @Html.DropDownListFor(m =&...
Calculate a Running Total in SQL Server
...do things like:
SELECT somedate, somevalue,
SUM(somevalue) OVER(ORDER BY somedate
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
AS RunningTotal
FROM Table
SQL Server gives you no clean solution to this problem. My gut is telling me that this is one of those rare cases w...
What columns generally make good indexes?
...ur tables:
Only index those columns that are required in WHERE and ORDER BY clauses. Indexing columns in abundance will result in some disadvantages.
Try to take benefit of "index prefix" or "multi-columns index" feature of MySQL. If you create an index such as INDEX(first_name, last_name), don...
Align DIV's to bottom or baseline
...
The answer posted by Y. Shoham (using absolute positioning) seems to be the simplest solution in most cases where the container is a fixed height, but if the parent DIV has to contain multiple DIVs and auto adjust it's height based on dynamic ...
What happens to a detached thread when main() exits?
... end of its execution has-happened-before the receiving of said signalling by a waiting thread), because, in general, there will be more code executed after e.g. a notify_all() of a condition variable, in particular the destructors of automatic and thread-local objects.
Running the signalling as th...
Webview load html from assets directory
...t.webview);
WebView wv;
wv = (WebView) findViewById(R.id.webView1);
wv.loadUrl("file:///android_asset/aboutcertified.html"); // now it will not fail here
}
}
share
...
How to crop circular area from bitmap in Android
...
You could also do this by clipping the bitmap against a circular clipping path. You could either do this every time you draw the bitmap, which means you'd never actually create a bitmap with transparent pixels, or you could draw the clipped bitmap...
Reload an iframe with jQuery
... a different domain, you could do something like this:
document.getElementById(FrameID).contentDocument.location.reload(true);
But since the iframe is on a different domain, you will be denied access to the iframe's contentDocument property by the same-origin policy.
But you can hackishly force ...