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Django admin: how to sort by one of the custom list_display fields that has no database field
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I loved Greg's solution to this problem, but I'd like to point that you can do the same thing directly in the admin:
from django.db import models
class CustomerAdmin(admin.ModelAdmin):
list_display = ('number_of_orders',)
def get_queryset(self, request):
# def queryset(self, reques...
Changing the color of the axis, ticks and labels for a plot in matplotlib
...a quick example (using a slightly cleaner method than the potentially duplicate question):
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(range(10))
ax.set_xlabel('X-axis')
ax.set_ylabel('Y-axis')
ax.spines['bottom'].set_color('red')
ax.spines['top'].set_col...
Can the C# interactive window interact with my code?
In Visual Studio 2015 or later, I can open the 'C# interactive window', and run code:
5 Answers
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What are “signed” cookies in connect/expressjs?
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The cookie will still be visible, but it has a signature, so it can detect if the client modified the cookie.
It works by creating a HMAC of the value (current cookie), and base64 encoded it. When the cookie gets read, it recalculates the signature and makes sure that it matches the sign...
How does @synchronized lock/unlock in Objective-C?
...nguage level synchronization uses the mutex, just like NSLock does. Semantically there are some small technical differences, but it is basically correct to think of them as two separate interfaces implemented on top of a common (more primitive) entity.
In particular with a NSLock you have an explic...
SQL Logic Operator Precedence: And and Or
...; a1 Or a2
Where a And b
is not the same as
Where a1 Or a2 And b,
because that would be Executed as
Where a1 Or (a2 And b)
and what you want, to make them the same, is the following (using parentheses to override rules of precedence):
Where (a1 Or a2) And b
Here's an example to illust...
How to get string width on Android?
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You can use the getTextBounds(String text, int start, int end, Rect bounds) method of a Paint object. You can either use the paint object supplied by a TextView or build one yourself with your desired text appearance.
Using a T...
Difference between an application server and a servlet container?
I am trying to understand the difference between a full fledged application server (e.g. Weblogic, JBoss etc.) and a servlet container (Tomcat, Jetty etc.).
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Are there any downsides to enabling git rerere?
...ault. So is there any downside to enabling rerere? What potential problems can it cause that would not otherwise occur?
4 A...
Replace specific characters within strings
...exist (disclaimer : I mainly use base regex functions but I know that they can be difficult for new users...)
– dickoa
Aug 13 '12 at 14:46
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