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Where should Rails 3 custom validators be stored?

I've seen docs/websites show that custom validators should go in a /lib or /lib/validators directory of a project. I've found (by reading an answer to another post) that they only seem to work in config/initializers . Does anyone know, or have a pointer to official documentation that shows wher...
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how to disable spellcheck Android edittext

I want to remove the underlines from texts inside edittext fields. 6 Answers 6 ...
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MySQL: how to get the difference between two timestamps in seconds

Is there a way I can make a query in MySQL that will give me the difference between two timestamps in seconds, or would I need to do that in PHP? And if so, how would I go about doing that? ...
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Find unmerged Git branches?

I have a Git repository with many branches, some of them already merged and some not. Since the number of branches is quite large, how can I determine which branches have not yet been merged? I would like to avoid having to do an "octopus" merge and re-merging branches that have already been merged....
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How to see which flags -march=native will activate?

I'm compiling my C++ app using GCC 4.3. Instead of manually selecting the optimization flags I'm using -march=native , which in theory should add all optimization flags applicable to the hardware I'm compiling on. But how can I check which flags is it actually using? ...
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Setting Django up to use MySQL

I want to move away from PHP a little and learn Python. In order to do web development with Python I'll need a framework to help with templating and other things. ...
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wpf: how to show tooltip when button disabled by command?

I'm trying to show a tooltip regardless of a buttons state, but this does not seem to do the trick: 3 Answers ...
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Understanding :source option of has_one/has_many through of Rails

Please help me in understanding the :source option of has_one/has_many :through association. The Rails API explanation makes very little sense to me. ...
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Python Matplotlib figure title overlaps axes label when using twiny

I am trying to plot two separate quantities on the same graph using twiny as follows: 6 Answers ...
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Cancel/kill window.setTimeout() before it happens

I have a few places where I use the line below to clear out a status, for example. I have a few of these that hang out for 10 seconds or more and if the user gets clicking around the action can occur at incorrect time intervals. ...