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Checking for empty queryset in Django
What is the recommended idiom for checking whether a query returned any results?
Example:
7 Answers
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Get specific ArrayList item
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id: "1"
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HTML5: number input type that takes only integers?
I'm using the jQuery Tools Validator which implements HTML5 validations through jQuery. It's been working great so far except for one thing. In the HTML5 specification, the input type "number" can have both integers and floating-point numbers. This seems incredibly short-sighted since it will only...
How can I match on an attribute that contains a certain string?
...rk for simple scenarios - but watch out if you want to use this answer in wider contexts with less or no control over the attribute values you are checking for. The correct answer is bobince's.
– Oliver
Feb 5 '13 at 9:11
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`static` keyword inside function?
... the source for Drupal 7, and I found some things I hadn't seen before. I did some initial looking in the php manual, but it didn't explain these examples.
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System.currentTimeMillis() vs. new Date() vs. Calendar.getInstance().getTime()
...nd, is relatively slow and very complex, since it has to deal with the considerably complexity and all the oddities that are inherent to dates and times (leap years, daylight savings, timezones, etc.).
It's generally a good idea to deal only with long timestamps or Date objects within your applicat...
How do I move a file with Ruby?
... File rename won't work across partitions, and throws the error "Invalid cross-device link". FileUtils is a better choice in those cases, but for a simple move in the same partition, rename works.
– d3vkit
Jan 25 '13 at 4:06
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How do you print out a stack trace to the console/log in Cocoa?
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New in Mac OS X 10.6, which didn't exist when this question was originally asked. For pre-Snow-Leopard, use the backtrace and backtrace_symbols functions; see the backtrace(3) manpage.
– Peter Hosey
Feb 25 '10 at 13...
How to make a vertical line in HTML
...xt, and use CSS to style it:
.verticalLine {
border-left: thick solid #ff0000;
}
<div class="verticalLine">
some other content
</div>
share
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improve this answer
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“Debug certificate expired” error in Eclipse Android plugins
I am using Eclipse Android plugins to build a project, but I am
getting this error in the console window:
17 Answers
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