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How to express a One-To-Many relationship in Django
...gnKeys not required (blank=True, null=True), or add some sort of custom validation to make sure that there is at least one or the other. what about the case of a business having a generic number? or an unemployed dude?
– j_syk
Aug 3 '11 at 23:08
...
Cost of storing AMI
... 1+ for mentioning that the size of the snapshot is what is being paid for, regardless of the actual space taken up on the snapshot itself. A 70GB snapshot with 40GB free and a 70GB with no space free will be both be billed at the same rate
– ShaneC
Dec ...
转：postfix安装Q&A - 更多技术 - 清泛网 - 专注C/C++及内核技术
...postfix安装Q&A 原文地址：http: bbs.chinaunix.net viewthread.php?tid=770141执照wangmingda老大的资料安装成功postfix（地址在这里http: www.extmail....
原文地址：http://bbs.chinaunix.net/viewthread.php?tid=770141
执照wangmingda老大的资...
How to go back to lines edited before the last one in Vim?
...ited line. Is there a way to go further in the editing history? I often accidentally insert something while browsing the file, undo, but then `. will not bring me where I want anymore.
...
String.replaceAll without RegEx
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
Understanding FFT output
...t on how you calculate your FFT.
The frequency to fft-bin equation is (bin_id * freq/2) / (N/2) where freq is your sample-frequency (aka 32 Hz, and N is the size of your FFT). In your case this simplifies to 1 Hz per bin. The bins N/2 to N represent negative frequencies (strange concept, I know). Fo...
Adding System.Web.Script reference in class library
...l not appear in the Add References dialog.
– Fiach Reid
Aug 30 '13 at 8:25
1
It's the year 2017, ...
How to get all enum values in Java?
... return a subtype of the enum type itself (if, say, the enum constant overrides a method from the enum type). getDeclaringClass() returns the enum type that declared that constant, which is what you want here.
– ColinD
Jan 20 '17 at 18:24
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How can I remove the string “\n” from within a Ruby string?
...
@David is correct. However, I felt that it was important to show that the quotes make a difference, since that would benefit Ben at this point. Mind you, David, it's probably more of a matter of style than "correct". Personally I...
C++ convert vector to vector
...
bad idea, because the constructor version will presize the vector by using the iterator category to note that those are random access iterators and then reserving enough space. Resizing prior to copy is a wasteful zero initializa...