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Override Java System.currentTimeMillis for testing time sensitive code
...making the code clearer. Nor do I see hiding those dependencies via static calls unnecessarily as "perfectly acceptable".
– Jon Skeet
Jun 25 '12 at 20:32
26
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Creating a dynamic choice field
... self.fields['waypoints'] = forms.ChoiceField(
choices=[(o.id, str(o)) for o in Waypoint.objects.filter(user=user)]
)
from your view while initiating the form pass the user
form = waypointForm(user)
in case of model form
class waypointForm(forms.ModelForm):
def __in...
Where is Vagrant saving changes to the VM?
... state is up to VirtualBox itself. This is a configurable location but typically defaults to ~/VirtualBox\ VMS for Mac OS X and Linux. In Windows the boxes are kept in %userprofile%\.vagrant.d\boxes
It is easy to find the place where they are getting created, regardless of what platform you happen ...
AngularJS: disabling all form controls between submit and server response
...-disabled="isSaving"> ... inputs ...</fieldset>
It will automatically disable all inputs inside the fieldset.
Then in controller set $scope.isSaving to true before http call and to false after.
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Understanding the ngRepeat 'track by' expression
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You can track by $index if your data source has duplicate identifiers
e.g.: $scope.dataSource: [{id:1,name:'one'}, {id:1,name:'one too'}, {id:2,name:'two'}]
You can't iterate this collection while using 'id' as identifier (duplicate id:1).
WON'T WORK:
<element ng-repeat="item...
How to efficiently compare two unordered lists (not sets) in Python?
a & b should be considered equal, because they have exactly the same elements, only in different order.
10 Answers
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Fastest way to extract frames using ffmpeg?
...use fast seeking to go to the desired time index and extract a frame, then call ffmpeg several times for every time index. Note that -accurate_seek is the default
, and make sure you add -ss before the input video -i option.
Note that it's better to use -filter:v -fps=fps=... instead of -r as the l...
How to create a new file together with missing parent directories?
...ntFile().mkdirs();
file.createNewFile();
I don't know of a single method call that will do this, but it's pretty easy as two statements.
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follo...
jQuery how to find an element based on a data-attribute value?
...value of current into an Attribute Equals selector:
$("ul").find(`[data-slide='${current}']`)
For older JavaScript environments (ES5 and earlier):
$("ul").find("[data-slide='" + current + "']");
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How to 'insert if not exists' in MySQL?
...Imagine we have a table:
CREATE TABLE `transcripts` (
`ensembl_transcript_id` varchar(20) NOT NULL,
`transcript_chrom_start` int(10) unsigned NOT NULL,
`transcript_chrom_end` int(10) unsigned NOT NULL,
PRIMARY KEY (`ensembl_transcript_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
Now imagine t...