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How do I filter ForeignKey choices in a Django ModelForm?
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Ok, thanks for expanding the example, but I seem to have to use form.fields["rate"].queryset to avoid "'ClientForm' object has no attribute 'rate'", am I missing something? (and your example should be form.rate.queryset to be consistent too.)
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Why is char[] preferred over String for passwords?
...method. Similarly, I have come across a suggestion not to use String to handle passwords.
17 Answers
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Java 8 Streams - collect vs reduce
...t argument to the operator is the return value of the previous application and the second argument is the current stream element.
collect is an aggregation operation where a "collection" is created and each element is "added" to that collection. Collections in different parts of the stream are then...
Plot logarithmic axes with matplotlib in python
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First of all, it's not very tidy to mix pylab and pyplot code. What's more, pyplot style is preferred over using pylab.
Here is a slightly cleaned up code, using only pyplot functions:
from matplotlib import pyplot
a = [ pow(10,i) for i in range(10) ]
pyplot.subplot(...
In-Place Radix Sort
...rt for DNA. It's written in D because that's the language that I use most and therefore am least likely to make silly mistakes in, but it could easily be translated to some other language. It's in-place but requires 2 * seq.length passes through the array.
void radixSort(string[] seqs, size_t base...
Embedding SVG into ReactJS
... any namespaced (colon-separated) attribute, e.g. xlink:href, remove the : and capitalize the second part of the attribute, e.g. xlinkHref. Here’s an example of an svg with <defs>, <use>, and inline styles:
function SvgWithXlink (props) {
return (
<svg
width...
What would be the Unicode character for big bullet in the middle of the character?
...! Came here on an attempt to find something larger than the Large Circle and what a surprise - it turned out to be the Medium Circle! =) Thank you, Mark!
– Mar
May 3 '19 at 18:05
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SQL Server dynamic PIVOT query?
... So \@cols must be string-concatenated, right? We can't use sp_executesql and parameter-binding to interpolate \@cols in there? Even though we construct \@cols ourself, what if somehow it contained malicious SQL. Any additional mitigating steps I could take before concatenating it and executing it?...
What's the difference between identifying and non-identifying relationships?
...t been able to fully grasp the differences. Can you describe both concepts and use real world examples?
15 Answers
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Output of git branch in tree like fashion
...it
But the full one I have been using is in "How to display the tag name and branch name using git log --graph" (2011):
git config --global alias.lgb "log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset%n' --abbrev-commit --date=relativ...