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In Django, how does one filter a QuerySet with dynamic field lookups?
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Python's argum>me m>nt expansion may be used to solve this problem:
kwargs = {
'{0}__{1}'.format('nam>me m>', 'startswith'): 'A',
'{0}__{1}'.format('nam>me m>', 'endswith'): 'Z'
}
Person.objects.filter(**kwargs)
This is a very common and use...
How to get the raw value an field?
How can i get the "real" value of an <input type="number"> field?
4 Answers
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Difference between UTF-8 and UTF-16?
...re a lot of good articles about this around the Web, but here is a short summary.
Both UTF-8 and UTF-16 are variable length encodings. However, in UTF-8 a character may occupy a minimum of 8 bits, while in UTF-16 character length starts with 16 bits.
Main UTF-8 pros:
Basic ASCII characters like ...
NSObject +load and +initialize - What do they do?
I'm interested in understanding the circumstances leading a developer to override +initialize or +load. Docum>me m>ntation makes it clear these m>me m>thods are called for you by the Objective-C runtim>me m>, but that's really all that is clear from the docum>me m>ntation of those m>me m>thods. :-)
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MySQL, update multiple tables with one query
...ave a function that updates three tables, but I use three queries to perform this. I wish to use a more convenient approach for good practice.
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Illegal string offset Warning PHP
I get a strange PHP error after updating my php version to 5.4.0-3.
16 Answers
16
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Xcode doesn't show the line that causes a crash
Every tim>me m> my app crashes Xcode highlights the UIApicationMain() call in the main() function as the line that caused the crash. In som>me m> cases that used to be normal (segm>me m>ntation fault for example) but the crash I am trying to deal with is a simple SIGABRT with detailed information logged in the con...
Split List into Sublists with LINQ
Is there any way I can separate a List<Som>me m>Object> into several separate lists of Som>me m>Object , using the item index as the delimiter of each split?
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Why does direction of index matter in MongoDB?
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MongoDB concatenates the compound key in som>me m> way and uses it as the key in a BTree.
When finding single items - The order of the nodes in the tree is irrelevant.
If you are returning a range of nodes - The elem>me m>nts close ...
bash HISTSIZE vs. HISTFILESIZE?
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Short answer:
HISTSIZE is the number of lines or commands that are stored in m>me m>mory in a history list while your bash session is ongoing.
HISTFILESIZE is the number of lines or commands that (a) are allowed in the history file at startup tim>me m> of a session,...