大约有 16,100 项符合查询结果（耗时：0.0224秒） [XML]
ManyRelatedManager object is not iterable
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TL;DR
For everyone who finds reading code in questions as TL;DR
Instead of query_set.many_to_many
you should use
query_set.many_to_many.all()
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Compelling examples of custom C++ allocators?
...l TBB's custom STL allocator significantly improve performance of a multithreaded app simply by changing a single
std::vector<T>
to
std::vector<T,tbb::scalable_allocator<T> >
(this is a quick and convenient way of switching the allocator to use TBB's nifty thread-private he...
android fragment onRestoreInstanceState
...
I know, that you have accepted answer, but you should read the official documentation about fragments, and it says (paragraph "Handling the Fragment Lifecycle"):
You can retain the state of a fragment using a Bundle, in case the activity's process is killed and you need to r...
How to hide a in a menu with CSS?
...c) but Chrome and IE will and it will hide the option.
EDIT: Oh yeah, I already implemented this in jQuery:
jQuery.fn.toggleOption = function( show ) {
jQuery( this ).toggle( show );
if( show ) {
if( jQuery( this ).parent( 'span.toggleOption' ).length )
jQuery( this ).u...
Why java.util.Optional is not Serializable, how to serialize the object with such fields
...y my) {
value=my.getValue().orElse(null);
}
private Object readResolve() throws ObjectStreamException {
My my=new My();
my.setValue(value);
return my;
}
}
The class Optional implements behavior which allows to write good code when dealing with possibly a...
Converting from longitude\latitude to Cartesian coordinates
...:
lat = asin(z / R)
lon = atan2(y, x)
asin is of course arc sine. read about atan2 in wikipedia. Don’t forget to convert back from radians to degrees.
This page gives c# code for this (note that it is very different from the formulas), and also some explanation and nice diagram of why t...
Useful example of a shutdown hook in Java?
...eps to be robust, and part of that involves shutting down gracefully. I am reading about shutdown hooks and I don't actually get how to make use of them in practice.
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Can ordered list produce result that looks like 1.1, 1.2, 1.3 (instead of just 1, 2, 3, …) with css?
...e-position: inside; styling on the list items, making wrapped text hard to read. Here's a simple workaround that also gives control over the margin between the number and text, and right-aligns the number as per the default behaviour.
ol {
counter-reset: item;
}
ol li {
display: block;
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How to do Mercurial's 'hg remove' for all missing files?
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the jk for a username is menacing, i feel like evertime i read one of your comments or posts you are saying "just kidding" at the end :( that being said, this helped, cheers!
– Lester Peabody
Sep 26 '11 at 21:39
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Update Row if it Exists Else Insert Logic with Entity Framework
..., but I'm running into this issue on update: An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key.
– John Zumbrum
Nov 29 '12 at 21:58
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