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MongoDB/NoSQL: Keeping Document Change History

A fairly common requirement in database applications is to track changes to one or more specific entities in a database. I've heard this called row versioning, a log table or a history table (I'm sure there are other names for it). There are a number of ways to approach it in an RDBMS--you can wri...
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Strangest language feature

What is, in your opinion, the most surprising, weird, strange or really "WTF" language feature you have encountered? 320 An...
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In HTML5, should the main navigation be inside or outside the element?

In HTML5, I know that <nav> can be used either inside or outside the page's masthead <header> element. For websites having both secondary and main navigation, it seems common to include the secondary navigation as a <nav> element inside the masthead <header> element ...
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Show the progress of a Python multiprocessing pool imap_unordered call?

I have a script that's successfully doing a multiprocessing Pool set of tasks with a imap_unordered() call: 9 Answers ...
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Is there a link to GitHub for downloading a file in the latest release of a repository?

Using GitHub's Release feature , it is possible to provide a link to download a specific version of the published software. However, every time a release is made, the gh-page also needs to be updated. ...
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Is UML practical? [closed]

In college I've had numerous design and UML oriented courses, and I recognize that UML can be used to benefit a software project, especially use-case mapping, but is it really practical? I've done a few co-op work terms, and it appears that UML is not used heavily in the industry. Is it worth ...
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How to make an enum conform to a protocol in Swift?

Swift documentation says that classes , structs , and enums can all conform to protocols, and I can get to a point where they all conform. But I can't get the enum to behave quite like the class and struct examples: ...
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to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh

To clarify the purpose of this question: I know HOW to create complicated views with both subviews and using drawRect. I'm trying to fully understand the when's and why's to use one over the other. ...
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Git pull a certain branch from GitHub

I have a project with multiple branches. I've been pushing them to GitHub , and now that someone else is working on the project I need to pull their branches from GitHub. It works fine in master. But say that someone created a branch xyz . How can I pull branch xyz from GitHub and merge it into ...
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How to convert Nonetype to int or string?

I've got an Nonetype value x , it's generally a number, but could be None . I want to divide it by a number, but Python raises: ...