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A cron job for rails: best practices?
What's the best way to run scheduled tasks in a Rails environment? Script/runner? Rake? I would like to run the task every few minutes.
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Move assignment operator and `if (this != &rhs)`
In the assignment operator of a class, you usually need to check if the object being assigned is the invoking object so you don't screw things up:
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When does invoking a member function on a null instance result in undefined behavior?
Consider the following code:
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Delete everything in a MongoDB database
I'm doing development on MongoDB. For totally non-evil purposes, I sometimes want to blow away everything in a database—that is, to delete every single collection, and whatever else might be lying around, and start from scratch. Is there a single line of code that will let me do this? Bonus points...
How to delete a character from a string using Python
There is a string, for example. EXAMPLE .
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How does lock work exactly?
I see that for using objects which are not thread safe we wrap the code with a lock like this:
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Long list of if statements in Java
Sorry I can't find a question answering this, I'm almost certain someone else has raised it before.
15 Answers
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sed in-place flag that works both on Mac (BSD) and Linux
Is there an invocation of sed todo in-place editing without backups that works both on Linux and Mac? While the BSD sed shipped with OS X seems to need sed -i '' … , the GNU sed Linux distributions usually come with interprets the quotes as empty input file name (instead of the backup exten...
Best practices for catching and re-throwing .NET exceptions
What are the best practices to consider when catching exceptions and re-throwing them? I want to make sure that the Exception object's InnerException and stack trace are preserved. Is there a difference between the following code blocks in the way they handle this?
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Hibernate throws MultipleBagFetchException - cannot simultaneously fetch multiple bags
Hibernate throws this exception during SessionFactory creation:
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