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Difference between Django's annotate and aggregate methods?
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what is reverse() in Django
... reverse() . I am not quite sure what this is but it is used together with HttpResponseRedirect. How and when is this reverse() supposed to be used?
...
Setting a property by reflection with a string value
...volving nullable types you will start receiving InvalidCastExceptions:
http://weblogs.asp.net/pjohnson/archive/2006/02/07/Convert.ChangeType-doesn_2700_t-handle-nullables.aspx
A wrapper was written a few years ago to handle this but that isn't perfect either.
http://weblogs.asp.net/pjohnso...
Accessing UI (Main) Thread safely in WPF
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Kotlin secondary constructor
...chnique 3. (when you need encapsulation) Use a factory method defined in a companion object
Sometimes you want your constructor private and only a factory method available to clients. For now this is only possible with a factory method defined in a companion object:
class C private (s: Int) {
...
Default template arguments for function templates
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Why is a round-trip conversion via a string not safe for a double?
...als of double.ToString based on architecture.
I suggest you file a bug at http://connect.microsoft.com
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Does C have a “foreach” loop construct?
... If you've got the "typeof" operator (gcc extension; pretty common on many other compilers) you can get rid of that "int *". The inner for loop becomes something like "for(typeof((array)+0) item = ..." Then you can call as "foreach( v, values ) ..."
– leander
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What is the pythonic way to avoid default parameters that are empty lists?
...rized in "the Hitchhikers Guide to Python" as "Mutable Default Arguments":
http://docs.python-guide.org/en/latest/writing/gotchas/
Quote: "Python’s default arguments are evaluated once when the function is defined, not each time the function is called (like it is in say, Ruby). This means that i...
How do I automatically update a timestamp in PostgreSQL
...change when the record is changed. This article explains it quite nicely:
http://www.revsys.com/blog/2006/aug/04/automatically-updating-a-timestamp-column-in-postgresql/
CREATE OR REPLACE FUNCTION update_modified_column()
RETURNS TRIGGER AS $$
BEGIN
NEW.modified = now();
RETURN NEW; ...