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How to delete a record in Django models?
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There are a couple of ways:
To delete it directly:
SomeModel.objects.filter(id=id).delete()
To delete it from an instance:
instance = SomeModel.objects.get(id=id)
instance.delete()
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PHP: Count a stdClass object
...y, not the properties on an object, (unless it's a custom object that implements the Countable interface). Try casting the object, like below, as an array and seeing if that helps.
$total = count((array)$obj);
Simply casting an object as an array won't always work but being a simple stdClass obje...
Interface or an Abstract Class: which one to use?
...ant to force developers working in your system (yourself included) to implement a set number of methods on the classes they'll be building.
Use an abstract class when you want to force developers working in your system (yourself included) to implement a set numbers of methods and you want to provid...
How do I copy an entire directory of files into an existing directory using Python?
Run the following code from a directory that contains a directory named bar (containing one or more files) and a directory named baz (also containing one or more files). Make sure there is not a directory named foo .
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How to use R's ellipsis feature when writing your own function?
...ifty feature for defining functions that can take a variable number of arguments. For example, the function data.frame takes any number of arguments, and each argument becomes the data for a column in the resulting data table. Example usage:
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RGB to hex and hex to RGB
...f rgbToHex(), as discussed in @casablanca's answer and suggested in the comments by @cwolves:
function rgbToHex(r, g, b) {
return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
}
alert(rgbToHex(0, 51, 255)); // #0033ff
Update 3 December 2012
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Less aggressive compilation with CSS3 calc
...ing less with twitter's recess it ignores this escaping. At least at the time of writing this comment.
– Attila Fulop
Nov 13 '12 at 12:12
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How to hide databases that I am not allowed to access
...ql database via pgAdmin3 , It lists all the tables (about 2600). Every time I open the pgAdmin3 I have to find my own database.
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How to handle floats and decimal separators with html5 input type number
...llar amounts, so I specified a step like this:
<input type="number" name="price"
pattern="[0-9]+([\.,][0-9]+)?" step="0.01"
title="This should be a number with up to 2 decimal places.">
There's nothing wrong with using jQuery to retrieve the value, but you will find ...
Checkout one file from Subversion
...at directory and do your modifications.
I'm not sure whether you can then merge your modified copy back entirely in the repository without a working copy of the target - I've never needed to. If so then do that.
If not then unfortunately you may have to find someone else who does have the whole di...