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How to express a NOT IN query with ActiveRecord/Rails?
Just to update this since it seems a lot of people come to this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci.
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Data structure: insert, remove, contains, get random element, all at O(1)
... I don't know of any hashtables that let you get an element like that, and if there are any, I can't imagine that this would be a constant time operation. I would be interested to be proven wrong on either count.
– guildner
Apr 16 '11 at 6:10
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“SetPropertiesRule” warning message when starting Tomcat from Eclipse [duplicate]
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Correct answer, never 'ignore' warnings if at all possible. Ignore enough warnings, some day they'll cause you to miss a REAL problem.
– Manius
Oct 18 '10 at 1:38
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How do I make curl ignore the proxy?
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If you don't want to override the http_proxy on a case-by-case basis, you can configure the domains to ignore with $no_proxy, and then alias your curl: alias curl='curl --noproxy $no_proxy'
– Sir4ur0n
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How to make a class JSON serializable
... "/foo/bar"}'
In that case you can merely call json.dumps(f.__dict__).
If you want more customized output then you will have to subclass JSONEncoder and implement your own custom serialization.
For a trivial example, see below.
>>> from json import JSONEncoder
>>> class MyEn...
RuntimeError on windows trying python multiprocessing
...will import (i.e. execute) the main module at start. You need to insert an if __name__ == '__main__': guard in the main module to avoid creating subprocesses recursively.
Modified testMain.py:
import parallelTestModule
if __name__ == '__main__':
extractor = parallelTestModule.ParallelExt...
How to get the raw value an field?
...algorithm says the browser is supposed to set the value to an empty string if the input isn't a valid floating point number.
The value sanitization algorithm is as follows: If the value of the
element is not a valid floating-point number, then set it to the empty
string instead.
By specify...
.rar, .zip files MIME Type
...zip
I would do a check on the file name too. Here is how you could check if the file is a RAR or ZIP file. I tested it by creating a quick command line application.
<?php
if (isRarOrZip($argv[1])) {
echo 'It is probably a RAR or ZIP file.';
} else {
echo 'It is probably not a RAR or Z...
What's the difference between BaseAdapter and ArrayAdapter?
I want to know the difference between using BaseAdapter and ArrayAdapter .
6 Answers
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How to check what user php is running as?
I need to detect if php is running as nobody. How do I do this?
16 Answers
16
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