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Setting the selected value on a Django forms.ChoiceField
...lf).__init__(*args, **kwargs)
# assign a (computed, I assume) default value to the choice field
self.initial['choices_field_name'] = 'default value'
# you should NOT do this:
self.fields['choices_field_name'].initial = 'default value'
...
How does OAuth 2 protect against things like replay attacks using the Security Token?
...ve kept the cheque and simply handed Luis his well-earned donut. So if we alter the example to make it that I authorize Olaf to get dough from some third party that I know, then it would make more sense as Olaf would have to get the dough before he starts baking the donut (assuming the lonely donut ...
How to print number with commas as thousands separators?
... need internationalization support, but it's clear, concise, and uses a built-in library.
P.S. That "%d" is the usual %-style formatter. You can have only one formatter, but it can be whatever you need in terms of field width and precision settings.
P.P.S. If you can't get locale to work, I'd sug...
reference assignment is atomic so why is Interlocked.Exchange(ref Object, Object) needed?
In my multithreaded asmx web service I had a class field _allData of my own type SystemData which consists of few List<T> and Dictionary<T> marked as volatile . The system data ( _allData ) is refreshed once in a while and I do it by creating another object called newData and fill...
Hashing a string with Sha256
...sing Encoding.UTF8.GetBytes instead.
But also, you will see different results depending on whether or not you consider the terminating '\0' byte to be part of the data you're hashing. Hashing the two bytes "Hi" will give a different result from hashing the three bytes "Hi". You'll have to decide wh...
Fragment onCreateView and onActivityCreated called twice
...erstand I'll post my (apparently working) code:
private class TabListener<T extends Fragment> implements ActionBar.TabListener {
private Fragment mFragment;
private Activity mActivity;
private final String mTag;
private final Class<T> mClass;
public TabListener(Acti...
Java's final vs. C++'s const
...).
Previously there wasn't a direct equivalent of const member functions although making functions non-virtual would be a potential option albeit without causing an error at compile time.
Likewise the Java:
public final class Bar {
}
public class Error extends Bar {
}
becomes in C++11:
class ...
Read input from console in Ruby?
...onstant, its elements can be modified and cleared with no trouble. By default, Ruby captures all the command line arguments passed to a Ruby program (split by spaces) when the command-line binary is invoked and stores them as strings in the ARGV array.
When written inside your Ruby program, ARGV wi...
How do I return the response from an asynchronous call?
...he callback is called.
Solution(s)
Embrace the asynchronous nature of JavaScript! While certain asynchronous operations provide synchronous counterparts (so does "Ajax"), it's generally discouraged to use them, especially in a browser context.
Why is it bad do you ask?
JavaScript runs in the UI thr...
Can overridden methods differ in return type?
...rybody here answered regarding Java >= 5, and some mentioned that Java < 5 does not feature covariant return types.
actually, the Java language spec >= 5 supports it, but the Java runtime does not. in particular, the JVM was not updated to support covariant return types.
in what was seen ...