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How to change a nullable column to not nullable in a Rails migration?
... to be nullable. Now I want to change it to be not nullable. How do I go about doing this assuming there are null rows in that database? I'm ok with setting those columns to Time.now if they're currently null.
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Logging uncaught exceptions in Python
How do you cause uncaught exceptions to output via the logging module rather than to stderr ?
10 Answers
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Does a const reference class member prolong the life of a temporary?
...uctor's argument n, and becomes invalid when the object n is bound to goes out of scope.
The lifetime extension is not transitive through a function argument. §12.2/5 [class.temporary]:
The second context is when a reference is bound to a temporary. The temporary to which the reference is boun...
How to terminate a Python script
...ements are honored, and it is possible to intercept the
exit attempt at an outer level.
The optional argument arg can be an integer giving the exit status
(defaulting to zero), or another type of object. If it is an integer,
zero is considered “successful termination” and any nonzero value is
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Removing event listener which was added with bind
...u want to remove the event you can tell jQuery "remove all foo events" without having to know the specific handler or removing other handlers.)
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Javascript AES encryption [closed]
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about edit3 link, it is a piece of crap of an article... half of its statements are completely false!
– mmm
Jan 10 '12 at 9:07
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Difference between HashSet and HashMap?
...plicate elements. If you want duplicates and not key->value, I'd check out a java.util.List implementation. Check out the Collection tutorial for a definitive guide: java.sun.com/docs/books/tutorial/collections/index.html
– justkt
May 5 '10 at 14:10
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How to split a string into a list?
... nltk.word_tokenize(raw_sentence)
This has the added benefit of splitting out punctuation.
Example:
>>> import nltk
>>> s = "The fox's foot grazed the sleeping dog, waking it."
>>> words = nltk.word_tokenize(s)
>>> words
['The', 'fox', "'s", 'foot', 'grazed', 'th...
Create a custom event in Java
... listeners.add(toAdd);
}
public void sayHello() {
System.out.println("Hello!!");
// Notify everybody that may be interested.
for (HelloListener hl : listeners)
hl.someoneSaidHello();
}
}
// Someone interested in "Hello" events
class Responder imple...
Capturing console output from a .NET application (C#)
... invoke a console application from my .NET application and capture all the output generated in the console?
8 Answers
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