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MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update
as the title says, I want to perform a find (one) for a document, by _id, and if doesn't exist, have it created, then whether it was found or was created, have it returned in the callback.
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How to Test a Concern in Rails
Given that I have a Personable concern in my Rails 4 application which has a full_name method, how would I go about testing this using RSpec?
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Best way to create an empty map in Java
I need to create an empty map.
7 Answers
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Why declare unicode by string in python?
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What is a “first chance exception”?
What exactly is a first chance exception? How and where does it originate in a .NET program? And why is it called by that peculiar name (what 'chance' are we talking about)?
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How do you push a Git tag to a branch using a refspec?
I want to force push, for example, my tag 1.0.0 to my remote master branch.
4 Answers
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How do I determine the target architecture of static library (.a) on Mac OS X?
I'm interested in verifying if a given iPhone static library has been built for ARM or Intel.
5 Answers
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fatal: 'origin' does not appear to be a git repository
I've a repository moodle on my Github account which I forked from the official repository.
6 Answers
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Accessing last x characters of a string in Bash
I found out that with ${string:0:3} one can access the first 3 characters of a string. Is there a equivalently easy method to access the last three characters?
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Using async-await on .net 4
I'm currently starting to create an application that would profit a lot from C# 5's async-await feature. But I'm not sure which version of VS and of the async runtime to use.
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