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Django select only rows with duplicate field values
...viously had a bug on this (might have been fixed in recent versions) where if you don't specify a fieldname for the Count annotation to saved as, it defaults to [field]__count. However, that double-underscore syntax is also how Django interprets you wanting to do a join. So, essentially when you try...
Do Git tags only apply to the current branch?
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If you create a tag by e.g.
git tag v1.0
the tag will refer to the most recent commit of the branch you are currently on. You can change branch and create a tag there.
You can also just refer to the other branch while tag...
获取文件系统映像及恢复删除的数据（FAT文件系统格式描述） - C/C++ - 清泛...
...L, DIGCF_PRESENT); //getting all devices with a removable disk guid
if ( INVALID_HANDLE_VALUE == hDevInfo )
{
return devInfos;//exit if there are no devices
}
try
{
std::wstring name;
RemovableDeviceInfo ...
How do I clear/delete the current line in terminal?
If I'm using terminal and typing in a line of text for a command, is there a hotkey or any way to clear/delete that line?
1...
IE8 and JQuery's trim()
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Try this instead:
if($.trim($('#group_field').val()) != ''){
More Info:
http://api.jquery.com/jQuery.trim/
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How do I open the SearchView programmatically?
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Expand the SearchView with
searchView.setIconified(false);
and collapse it with
searchView.setIconified(true);
You need to change the value of android:showAsAction from ifRoom|collapseActionView to always. The SearchView's attribute android:iconifiedByDefault shoul...
Is there an equivalent to e.PageX position for 'touchstart' event as there is for click event?
...start', function(e) {
var xPos = e.originalEvent.touches[0].pageX;
});
If you want other fingers, you can find them in other indices of the touches list.
UPDATE FOR NEWER JQUERY:
$(document).on('touchstart', '#box', function(e) {
var xPos = e.originalEvent.touches[0].pageX;
});
...
What does auto do in margin:0 auto?
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When you have specified a width on the object that you have applied margin: 0 auto to, the object will sit centrally within it's parent container.
Specifying auto as the second parameter basically tells the browser to automatically determine ...
How to redirect the output of an application in background to /dev/null
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You use:
yourcommand > /dev/null 2>&1
If it should run in the Background add an &
yourcommand > /dev/null 2>&1 &
>/dev/null 2>&1 means redirect stdout to /dev/null AND stderr to the place where stdout points at that time
If you wan...
foldl versus foldr behavior with infinite lists
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How folds differ seems to be a frequent source of confusion, so here's a more general overview:
Consider folding a list of n values [x1, x2, x3, x4 ... xn ] with some function f and seed z.
foldl is:
Left associative: f ( ... (f (f ...