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Temporarily disable auto_now / auto_now_add
...tion. I needed to "force" an expired timestamp. In my case I did the trick by using a queryset update. Like this:
# my model
class FooBar(models.Model):
title = models.CharField(max_length=255)
updated_at = models.DateTimeField(auto_now=True, auto_now_add=True)
# my tests
foo = FooBar.ob...
How to set environment variables from within package.json
...t variable in a natively cross platform fashion, but the key is it is used by npm in an ad hoc and one-time fashion, just for the npm script execution. (It's not set or exported for future reference.) As long as you're running your command from the npm script, there's no issue. Also, the "&&a...
Why is the String class declared final in Java?
....
One advantage of immutable objects is that
You can share duplicates by pointing them to a single instance.
(from here).
If String were not final, you could create a subclass and have two strings that look alike when "seen as Strings", but that are actually different.
...
What does “Git push non-fast-forward updates were rejected” mean?
...e without losing commits, so it refuses the push.
Usually this is caused by another user pushing to the same branch. You can remedy this by fetching and merging the remote branch, or using pull to perform both at once.
In other cases this error is a result of destructive changes made locally ...
Require either of two arguments using argparse
...
HEy @ijoseph, this answer is prett old by now. I'm not sure what the answer was any more. It probably has been removed by now. Sorry for that!
– jlengrand
Apr 13 '18 at 9:13
...
How to define multiple name tags in a struct
...
It says in the documentation of the reflect package:
By convention, tag strings are a concatenation of optionally space-separated key:"value" pairs. Each key is a non-empty string consisting of non-control characters other than space (U+0020 ' '), quote (U+0022 '"'), and colon ...
How do I hide .class files from the Open Resource dialog in Eclipse?
... '.class' files, they probably aren't being marked as derived. If they're by themselves in their own folder hierarchy you can fix this by right-clicking the root folder to edit folder properties, and check the 'Derived' checkbox. If they're mixed with your '.java' files...tough luck, you'll need t...
What is difference between instantiating an object using new vs. without
...ope, generally on the stack, which will be destroyed when its scope ends.
By contrast:
Time* t = new Time(12, 0, 0);
... allocates a block of memory by calling either ::operator new() or Time::operator new(), and subsequently calls Time::Time() with this set to an address within that memory bloc...
How to make a cross-module variable?
...l from any other module that includes __builtin__ -- which is all of them, by default.
a.py contains
print foo
b.py contains
import __builtin__
__builtin__.foo = 1
import a
The result is that "1" is printed.
Edit: The __builtin__ module is available as the local symbol __builtins__ -- that's...
What is the difference among col-lg-*, col-md-* and col-sm-* in Bootstrap?
...trol grid behavior on different widths. The different tiers are controlled by CSS media queries.
So in Bootstrap's 12-column grid...
col-sm-3 is 3 of 12 columns wide (25%) on a typical small device width (> 768 pixels)
col-md-3 is 3 of 12 columns wide (25%) on a typical medium device width (> ...