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Sequence contains no elements?
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In hind sight, I'm really not sure >_< Silly problem really.
– Andy Hunt
Aug 24 '09 at 20:03
add a comment
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How to move a model between two Django apps (Django 1.7)
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I am removing the old answer as may result in data loss. As ozan mentioned, we can create 2 migrations one in each app. The comments below this post refer to my old answer.
First migration to remove model from 1st app.
$ python manage.py makemigrations old_app --...
How to use JUnit to test asynchronous processes
... (e.g. w/ Cucumber), waiting for an async completion and verifying the result is absolutely necessary.
– Les Hazlewood
Sep 3 '14 at 20:09
40
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How do I (or can I) SELECT DISTINCT on multiple columns?
...extremely inefficient and unnecessarily so. Don't use this. I provided an alternative and some explanation in another answer.
– Erwin Brandstetter
Sep 30 '12 at 20:45
1
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Wait one second in running program
...w System.Windows.Forms.Timer();
if (milliseconds == 0 || milliseconds < 0) return;
// Console.WriteLine("start wait timer");
timer1.Interval = milliseconds;
timer1.Enabled = true;
timer1.Start();
timer1.Tick += (s, e) =>
{
timer1.Enabled = false;
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Copying the GNU screen scrollback buffer to a file (extended hardcopy)
...to a file, type
Ctrl + A and :
to get to command mode, then
hardcopy -h <filename>
In older versions of screen, if you just do hardcopy -h, it just writes to the file -h. This was fixed in version 4.2.0, so hardcopy -h writes to hardcopy.N where N is the current window number.
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Regex lookahead, lookbehind and atomic groups
...?!bar) finds the 2nd bar ("bar" which does not have "bar" after it)
(?<=foo)bar finds the 1st bar ("bar" which has "foo" before it)
(?<!foo)bar finds the 2nd bar ("bar" which does not have "foo" before it)
You can also combine them:
(?<=foo)bar(?=bar) finds the 1st bar ("bar...
Unsubscribe anonymous method in C#
...lass MyClass
{
public event EventHandler MyEvent;
public IEnumerable<EventHandler> GetMyEventHandlers()
{
return from d in MyEvent.GetInvocationList()
select (EventHandler)d;
}
}
So you can access the whole invocation list from outside MyClass and unsub...
Link latest file on Bitbucket Git repository
... functionality to link to the latest version of a file with this syntax:
<<file path/to/file [revision] [linenumber]>>
Just omit the revision and line number parameters, they are optional.
Then, refer to the wiki page everywhere else you'd like link to the read me file.
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Converting many 'if else' statements to a cleaner approach [duplicate]
... like this for each converter. Then you could set up a map like this:
Map<String, Converter> mimeTypeMap = new HashMap<String, Converter>();
mimeTypeMap.put("audio/mpeg", new MpegConverter());
Then your convertToMp3 method becomes like this:
Converter converter = mimeTypeMap.get(mim...