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How do I filter ForeignKey choices in a Django ModelForm?
... the default ModelForm object, form.fields["rate"].queryset = ...
This is done explicitly in the view. No hacking around.
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When to use ' (or quote) in Lisp?
...nderstand what the special operator (quote) (or equivalent ' ) function does, yet this has been all over Lisp code that I've seen.
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When to use Storyboard and when to use XIBs
...d when to use XIBs? what are the pros and cons of each and what situations do they each suit?
9 Answers
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What does it mean if a Python object is “subscriptable” or not?
Which types of objects fall into the domain of "subscriptable"?
6 Answers
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Is it abusive to use IDisposable and “using” as a means for getting “scoped behavior” for exception
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I don't think so, necessarily. IDisposable technically is meant to be used for things that have non-managed resources, but then the using directive is just a neat way of implementing a common pattern of try .. finally { dispos...
Call a function from another file?
... I tried this, but it is still showing the error: Has it got anything to do with Python 3, or is a general problem?
– DarkRose
Jun 29 '15 at 7:02
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Resolve promises one after another (i.e. in sequence)?
...and omit concurrency param
readAll.then(function(allFileContents){
// do stuff to read files.
});
Although there is really no reason not to use async await today.
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How do I make the method return type generic?
...t(friends.get(name));
}
Then call it as such:
jerry.callFriend("spike", Dog.class).bark();
jerry.callFriend("quacker", Duck.class).quack();
This code has the benefit of not generating any compiler warnings. Of course this is really just an updated version of casting from the pre-generic days an...
How do you convert epoch time in C#?
How do you convert Unix epoch time into real time in C#? (Epoch beginning 1/1/1970)
14 Answers
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What are the best practices for catching and re-throwing exceptions?
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You should not be catching the exception unless you intend to do something meaningful.
"Something meaningful" might be one of these:
Handling the exception
The most obvious meaningful action is to handle the exception, e.g. by displaying an error message and aborting the operation:
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