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warning: refname 'HEAD' is ambiguous

... Rename it: git branch -m HEAD newbranch then you can examine it and decide what to do (delete it, or save under a descriptive branch name) (The origin/HEAD remote branch is not a problem) share | ...
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Expanding tuples into arguments

...pears you can only do this if the expanded tuple is after the normally-provided arguments - the interpreter doesn't like it when I do this: some_func(*tuple_of_stuff, another_argument) – Tom Galvin Apr 19 '15 at 20:46 ...
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How do I check the operating system in Python?

...Windows... sys.platform has finer granularity than sys.name. For the valid values, consult the documentation. See also the answer to “What OS am I running on?” share | improve this answer ...
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How do you get the rendered height of an element?

... it? I'd agree that jQuery is overkill for a lot of things and I'm not afraid of vanilla JS, but when there is a function in a library that does exactly what you need, it seems silly not to use it, particularly for reasons of "Not Invented Here" – Russ Cam Jun ...
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Rails migrations: self.up and self.down versus change

... rollback? It's not possible, so you need to define the down method. As said, I suggest you to read the Rails Migrations Guide. share | improve this answer | follow ...
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Nginx not picking up site in sites-enabled?

... I had the same problem. It was because I had accidentally used a relative path with the symbolic link. Are you sure you used full paths, e.g.: ln -s /etc/nginx/sites-available/example.com.conf /etc/nginx/sites-enabled/example.com.conf ...
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invalid multibyte char (US-ASCII) with Rails and Ruby 1.9

.... As for as ASCII is concerned, those are gibberish, that happens to be valid in a related encoding. – Phil Miller Nov 16 '09 at 3:22 add a comment  |  ...
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When annotating a class with @Component, does this mean it is a Spring Bean and Singleton?

... creating Singletons, will i not run into concurrency issues? To my newbie idea it will results in a bean that is used throughout the ApplicationContext, so concurrent users will get a reference to the single bean. Or am i missing something? – Marco May 6 '11 a...
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What is `params.require(:person).permit(:name, :age)` doing in Rails 4?

..., but it's actually an instance of ActionController::Parameters, which provides several methods such as require and permit. The require method ensures that a specific parameter is present, and if it's not provided, the require method throws an error. It returns an instance of ActionController::Par...
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How to deserialize a JObject to .NET object

... Any ideas on the performance implications here? Will reflection be used every time? – Shaun Rowan Nov 2 '13 at 21:46 ...