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How do I filter ForeignKey choices in a Django ModelForm?
...his in a form class, but can do it directly in the ModelAdmin, as Django already includes this built-in method on the ModelAdmin (from the docs):
ModelAdmin.formfield_for_foreignkey(self, db_field, request, **kwargs)¶
'''The formfield_for_foreignkey method on a ModelAdmin allows you to
overrid...
Difference between android-support-v7-appcompat and android-support-v4
... was answered. Good thing is, it is very well documented also. So you must read Support Library Documentation for more details and more available support library.
Starting with Support Library release 26.0.0 (July 2017), the minimum
supported API level across most support libraries has increa...
C++ 读写xml方法整理（持续更新） - C/C++ - 清泛网 - 专注C/C++及内核技术
...art, end);
for (;;) {
int done;
int len;
len = (int)fread(Buff, 1, BUFFSIZE, stdin);
if (ferror(stdin)) {
fprintf(stderr, "Read error\n");
exit(-1);
}
done = feof(stdin);
if (XML_Parse(p, Buff, len, done) == XML_STATUS_ERROR) {
fprintf...
SAML: Why is the certificate within the Signature?
...se the user details supplied in the SAML attributes supplied.
You could already have the public key, meaning that the signature shouldn't need to include the public key again, but you could also have multiple possible known senders, or even a chain of known senders.
For instance you may have two t...
Linux的诞生和发展 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的一个问题时，所说的第一句话是"阅读源代码"（"RTFSC (Read the Fucking Source Code :-)"）。他认为答案就在源程序中。这也说明了对于学习系统软件来说，你不光需要懂得系统的工作基本原理，还需要结合实际系统，学习实际系统的...
How to simulate Android killing my process
...
@DavidWasser Read the spec! developer.android.com/guide/components/services.html#Foreground A foreground service is a service that the user is actively aware of and is not a candidate for the system to kill when low on memory.
...
Python Logging (function name, file name, line number) using a single file
...
The correct answer for this is to use the already provided funcName variable
import logging
logger = logging.getLogger('root')
FORMAT = "[%(filename)s:%(lineno)s - %(funcName)20s() ] %(message)s"
logging.basicConfig(format=FORMAT)
logger.setLevel(logging.DEBUG)
The...
boolean in an if statement
...eck is appropriate given the desire of the code. For example:
// The DOM ready check for Internet Explorer
function doScrollCheck() {
if ( jQuery.isReady ) {
return;
}
...
share
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Test a weekly cron job [closed]
..." to attach and watch it run. If the command is a script, you can put a "read" command at the top to make it stop and wait for the screen attachment to complete (hit enter after attaching)
If your command is a bash script, you can do this instead:
* * * * * crontest --bashdb /command/to/be/teste...
Quicksort: Choosing the pivot
...
I was reading abt introsort which combines good features of both quicksort and heapsort. The approach to select pivot using median of three might not always be favourable.
– Sumit Kumar Saha
F...