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Select DISTINCT individual columns in django?
...g note in the docs about using distinct(). The above example will work but all combinations of distinct() and values() may not.
PS: it is a good idea to use lower case names for fields in a model. In your case this would mean rewriting your model as shown below:
class ProductOrder(models.Model):
...
Store JSON object in data attribute in HTML jQuery
...in the text just use $('#myElement').data('key',jsonObject);
it won't actually be stored in the html, but if you're using jquery.data, all that is abstracted anyway.
To get the JSON back don't parse it, just call:
var getBackMyJSON = $('#myElement').data('key');
If you are getting [Object Objec...
How can I make git show a list of the files that are being tracked?
...
If you want to list all the files currently being tracked under the branch master, you could use this command:
git ls-tree -r master --name-only
If you want a list of files that ever existed (i.e. including deleted files):
git log --pretty=f...
Best practices around generating OAuth tokens?
...ere are any best practices for creating significantly secure tokens (especially Token/Secret combinations).
1 Answer
...
tinyxml XML解析库下载（tinyxml2.h 和 tinyxml2.cpp） - 源码下载 - 清泛...
...>
# include <cstdarg>
#endif
/*
TODO: intern strings instead of allocation.
*/
/*
gcc:
g++ -Wall -DDEBUG tinyxml2.cpp xmltest.cpp -o gccxmltest.exe
Formatting, Artistic Style:
AStyle.exe --style=1tbs --indent-switches --break-closing-brackets --indent-preproce...
Argparse: Required argument 'y' if 'x' is present
...
No, there isn't any option in argparse to make mutually inclusive sets of options.
The simplest way to deal with this would be:
if args.prox and (args.lport is None or args.rport is None):
parser.error("--prox requires --lport and --rport.")
...
SET versus SELECT when assigning variables?
...ed then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from its previous value)
As far as speed differences - there are no direct differences between SET and SELECT. However SELECT's ability to make multiple assignments in one shot does ...
How to put a unicode character in XAML?
...
Markup files that are created in Microsoft Visual Studio are
automatically saved in the Unicode UTF-8 file format, which means that
most special characters, such as accent marks, are encoded correctly.
However, there is a set of commonly-used special characters that are
handled differentl...
What's the difference between “groups” and “captures” in .NET regular expressions?
...hat
each Group object contains a
collection of Captures representing
all the intermediary matches by the
group during the match, as well as the
final text matched by the group.
And a few pages later, this is his conclusion:
After getting past the .NET
documentation and actually
...
docker mounting volumes on host
...independent of the container's life cycle. Docker therefore never automatically delete volumes when you remove a container, nor will it "garbage collect" volumes that are no longer referenced by a container." One of these statements must be wrong.
– mc0e
May 6...