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Couldn't connect to server 127.0.0.1:27017
...indicates that mongodb is terminating because there is an old lock file.
If you are not and were not running with journaling, remove the lock file, run repair, and start mongodb again.
If you are or were running with journaling turned on, see the relevant Mongo DB docs. Note that they say "If you...
Get JSF managed bean by name in any Servlet related class
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In a servlet based artifact, such as @WebServlet, @WebFilter and @WebListener, you can grab a "plain vanilla" JSF @ManagedBean @RequestScoped by:
Bean bean = (Bean) request.getAttribute("beanName");
and @ManagedBean @SessionScoped by:
Bean bean =...
Best practice using NSLocalizedString
...he existing string files as closely as possible to avoid having too big a diff when updating them.
Naming your strings
If you use NSLocalizedString as advertised:
NSLocalizedString(@"Cancel or continue?", @"Cancel notice message when a download takes too long to proceed");
You may end up defini...
Heavy usage of Python at Google [closed]
...ome specialized languages such as sawzall are also in the mix for very specific tasks, and of course Javascript is very important for browser-side work.
Other languages, including the ones that Greg mentioned back in '06, are either "kind of accidental" or used for other specific tasks (e.g., Objec...
Why can't static methods be abstract in Java?
...ements no functionality", and "static" means: "There is functionality even if you don't have an object instance". And that's a logical contradiction.
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How do I detach objects in Entity Framework Code First?
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If you want to detach existing object follow @Slauma's advice. If you want to load objects without tracking changes use:
var data = context.MyEntities.AsNoTracking().Where(...).ToList();
As mentioned in comment this will n...
How many random elements before MD5 produces collisions?
...uadrillion 607 trillion 431 billion 768 million 211 thousand 456.
However if you keep all the hashes then the probability is a bit higher thanks to birthday paradox. To have a 50% chance of any hash colliding with any other hash you need 264 hashes. This means that to get a collision, on average, y...
How to get all of the immediate subdirectories in Python
...scandir:
list_subfolders_with_paths = [f.path for f in os.scandir(path) if f.is_dir()]
Bonus: With scandir you can also simply only get folder names by using f.name instead of f.path.
This (as well as all other functions below) will not use natural sorting. This means results will be sorted lik...
What to put in a python module docstring? [closed]
...ion are roughly equivalent to help in terms of amount of information). So if you have in x.py:
"""This module does blah blah."""
class Blah(object):
"""This class does blah blah."""
then:
>>> import x; help(x)
shows:
Help on module x:
NAME
x - This module does blah blah.
FI...
Have a reloadData for a UITableView animate when changing
...ITableView that has two modes. When we switch between the modes I have a different number of sections and cells per section. Ideally, it would do some cool animation when the table grows or shrinks.
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