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how to generate migration to make references polymorphic
I have a Products table and want to add a column:
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WebSocket with SSL
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answered Mar 17 '12 at 17:29
Peter Moskovits...
Python using enumerate inside list comprehension
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Try this:
[(i, j) for i, j in enumerate(mylist)]
You need to put i,j inside a tuple for the list comprehension to work. Alternatively, given that enumerate() already returns a tuple, you can return it directly without unpacking it first:
[pair for pair in...
What does the arrow operator, '->', do in Java?
While hunting through some code I came across the arrow operator, what exactly does it do? I thought Java did not have an arrow operator.
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What is the difference between Digest and Basic Authentication?
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Digest Authentication communicates credentials in an encrypted form by applying a hash function to: the username, the password, a server supplied nonce value, the HTTP method and the requested URI.
Whereas Basic Authentication uses non-encrypted b...
How to drop into REPL (Read, Eval, Print, Loop) from Python code
Is there a way to programmatically force a Python script to drop into a REPL at an arbitrary point in its execution, even if the script was launched from the command line?
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How to count occurrences of a column value efficiently in SQL?
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This should work:
SELECT age, count(age)
FROM Students
GROUP by age
If you need the id as well you could include the above as a sub query like so:
SELECT S.id, S.age, C.cnt
FROM Students S
INNER JOIN (SELECT age, count(age) as cnt
FR...
Creating an official github mirror
How do I create a github mirror for an external git repository, such that it appears as "real mirror", e.g., as in https://github.com/mirrors ?
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How to see full symlink path
When I'm using ls -la symlinkName or stat symlinkName not all the path is displayed
(e.g ../../../one/two/file.txt )
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Why is exception handling bad?
...e's Go language has no exceptions as a design choice, and Linus of Linux fame has called exceptions crap. Why?
15 Answers
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