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How does type Dynamic work and how to use it?
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Scalas type Dynamic allows you to call methods on objects that don't exist or in other words it is a replica of "method missing" in dynamic languages.
It is correct, scala.Dynamic doesn't have any members, it is just a marker interface - the co...
Test if something is not undefined in JavaScript
...this is not a good way to perform the check because undefined is not a JavaScript keyword (although everyone seems to think it is). If you want to, you could create a variable called undefined and then this check will be incorrect. The only correct way is to check (typeof myVar !== 'undefined').
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Cannot resolve the collation conflict between “SQL_Latin1_General_CP1_CI_AS” and “Latin1_General_CI_
...lations are needed and used when ordering and comparing strings. It's generally a good idea to have a single, unique collation used throughout your database - don't use different collations within a single table or database - you're only asking for trouble....
Once you've settled for one single col...
How can I make PHP display the error instead of giving me 500 Internal Server Error [duplicate]
...ese settings (except display_startup_errors) at the very beginning of your script to set them at runtime (though you may not catch all errors this way):
error_reporting(E_ALL);
ini_set('display_errors', 'On');
After that, restart server.
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Keyboard Interrupts with python's multiprocessing Pool
...s to set up the worker processes to ignore SIGINT altogether, and confine all the cleanup code to the parent process. This fixes the problem for both idle and busy worker processes, and requires no error handling code in your child processes.
import signal
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def init_worker():
signal.sign...
Checking for empty queryset in Django
...if not my_objects: to demonstrate that this is how they do it in the docs. All else is utterly irrelevant so I do not get your point. They could as well make a thousand queries and it would still be totally irrelevant as this is not the point of this answer, with which I make clear that I agree.
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jQuery get the image src
...onsole.log('for relative image url ' + $('#imageId').attr('src'));
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<img id='imageId' src='images/image1.jpg' height='50px' width='50px'/>
<input type='button' onclick='showImgUrl()' ...
Can PostgreSQL index array columns?
... to this question in the documentation. If a column is an array type, will all the entered values be individually indexed?
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Is there a short contains function for lists?
...her have said, you may also be interested to know that what in does is to call the list.__contains__ method, that you can define on any class you write and can get extremely handy to use python at his full extent.
A dumb use may be:
>>> class ContainsEverything:
def __init__(self):...
Node.js / Express.js - How does app.router work?
...use is app.use() . When the middleware is being executed, it will either call the next middleware by using next() or make it so no more middleware get called. That means that the order in which I place my middleware calls is important, because some middleware depends on other middleware, and some...