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Django admin: how to sort by one of the custom list_display fields that has no database field
...ustom manager for Customer which includes the number of orders aggregated, and then setting admin_order_field to that aggregate, ie
from django.db import models
class CustomerManager(models.Manager):
def get_query_set(self):
return super(CustomerManager, self).get_query_set().annotat...
dismissModalViewControllerAnimated deprecated
...tially, view controllers presented by this API are no longer always modal, and since they were adding a completion handler it was a good time to rename it.
In response to comment from Marc:
What's the best way to support all devices 4.3 and above? The new
method doesn't work in iOS4, yet the ...
How to use QueryPerformanceCounter?
...eded to change from using milliseconds to microseconds for my Timer class, and after some research I've decided that QueryPerformanceCounter is probably my safest bet. (The warning on Boost::Posix that it may not works on Win32 API put me off a bit). However, I'm not really sure how to implement i...
format statement in a string resource file
...t markers - %[POSITION]$[TYPE] (where [POSITION] is the attribute position and [TYPE] is the variable type), rather than the short versions, for example %s or %d.
Quote from Android Docs: String Formatting and Styling:
<string name="welcome_messages">Hello, %1$s! You have %2$d new messages....
How to: Define theme (style) item for custom widget
...y throughout our application. The widget class derives from ImageButton and extends it in a couple of simple ways. I've defined a style which I can apply to the widget as it's used, but I'd prefer to set this up through a theme. In R.styleable I see widget style attributes like imageButtonSty...
How to percent-encode URL parameters in Python?
...ce special characters in string
using the %xx escape. Letters, digits,
and the characters '_.-' are never
quoted. By default, this function is
intended for quoting the path section
of the URL.The optional safe parameter
specifies additional characters that
should not be quoted — its ...
How can I make a JUnit Test wait?
...
This answer should be removed, and considered harmful. A much better answer below is stackoverflow.com/a/35163873/1229735
– yiati
Apr 6 at 16:31
...
Why do function pointer definitions work with any number of ampersands '&' or asterisks '*'?
...foo)() = foo; works: foo is implicitly converted into a pointer to itself and that pointer is assigned to p1_foo.
The unary &, when applied to a function, yields a pointer to the function, just like it yields the address of an object when it is applied to an object. For pointers to ordinary f...
What is a memory fence?
...are concept. In higher level languages we are used to dealing with mutexes and semaphores - these may well be implemented using memory fences at the low level and explicit use of memory barriers are not necessary. Use of memory barriers requires a careful study of the hardware architecture and more ...
Spring @PostConstruct vs. init-method attribute
Is there any difference between using the @PostConstruct annotation and declaring the same method as init-method in Spring XML configuration?
...