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Rails: select unique values from a column
...el.uniq.pluck(:rating)
# rails 5+
Model.distinct.pluck(:rating)
Update
Apparently, as of rails 5.0.0.1, it works only on "top level" queries, like above. Doesn't work on collection proxies ("has_many" relations, for example).
Address.distinct.pluck(:city) # => ['Moscow']
user.addresses.disti...
How do I disable a jquery-ui draggable?
...e side effect of using disable is the draggable elements have a greyed out appearance. destroy seems to leave the appearance alone.
– samazi
Oct 3 '14 at 11:42
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Clear text from textarea with selenium
I've got some tests where I'm checking that the proper error message appears when text in certain fields are invalid. One check for validity is that a certain textarea element is not empty.
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How to activate virtualenv?
... the flask project directory and under microblog directory there should be app and venv folders. then run the below command, This is one worked for me in Ubuntu.
source venv/bin/activate
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PhoneGap Eclipse Issue - eglCodecCommon glUtilsParamSize: unknow param errors
...aused if you use the "Use host GPU" setting of the emulator and it will disappear after you uncheck this option. If you still need "Use host GPU", you can just filter out the errors by customizing the Logcat Filter. Enter ^(?!eglCodecCommon) into the "by Log Tag (regex)" field in order to strip out ...
Is there a JavaScript MVC (micro-)framework? [closed]
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JavaScriptMVC is an excellent solution. It's everything is a plugin approach enables you to select only the features you need. As of 2.0, it's based on jQuery.
On progressively enhancing your website, that's left up to the user as JMVC provides just a middle layer for development - it's u...
Git 'fatal: Unable to write new index file'
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It happened to me that the file .git/index was in use by another process (my local development web server). I shut down the process and then it worked.
s...
Gem::LoadError for mysql2 gem, but it's already in Gemfile
...s 4.1.5) try using this version of mysql2:
gem 'mysql2', '~> 0.3.18'
Apparently mysql2 isn't still compatible with newer version of rails because rails 4.2.4 is pretty new as the time of answering this question by me 8 September 2015 so use the above line in your Gem file and run:
bundle ins...
iPhone: Setting Navigation Bar Title
... the title of a navBar inside a tabBar controller, do this:
-(void)viewDidAppear:(BOOL)animated {
self.navigationController.navigationBar.topItem.title = @"myTitle";
}
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AsyncTask threads never die
...dition to CommonsWare's response:
Currently I'm using Android 2.2, and my application uses no more than one AsyncTask at any time, but I'm creating a new one every x minutes. At first new AsyncTask Threads start to appear (a new Thread for a new AsyncTask) but after 5 threads (as mentioned by Commo...