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Validate uniqueness of multiple columns
...or, but in general I recommend using a database constraint.
More reading: https://robots.thoughtbot.com/validation-database-constraint-or-both
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Remove data.frame row names when using xtable
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In Windows Azure: What are web role, worker role and VM role?
...traightforward use cases:
You can run any code that exposes a tcp, http, https, or udp endpoint (web applications, SOAP/REST services, etc.). You need to think about the stateless way of doing things though - if you have more than one VM instance running, user traffic is distributed across those i...
How to compare types
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Is it possible to create a “weak reference” in javascript?
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When running JS on NodeJS, you may consider https://github.com/TooTallNate/node-weak.
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Using comparison operators in Scala's pattern matching system
...al question, some additional information can be found in the documentation https://docs.scala-lang.org/tour/pattern-matching.html , they didn't fit in my case but because this stackoverflow answer is the first suggestion in Google I would like to post my answer which is a corner case of the question...
How to get the anchor from the URL using jQuery?
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If you have a string with an URL/hash, the easiest method is:
var url = 'https://www.stackoverflow.com/questions/123/abc#10076097';
var hash = url.split('#').pop();
If you're using jQuery, use this:
var hash = $(location).attr('hash');
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Docker can't connect to docker daemon
...install machine binaries on Linux:
locally:
install -vm755 <(curl -L https://github.com/docker/machine/releases/download/v0.5.3/docker-machine_linux-amd64) $HOME/bin/docker-machine
global:
sudo bash -c 'install -vm755 <(curl -L https://github.com/docker/machine/releases/download/v0.5.3/do...
Parsing JSON with Unix tools
...lot easier and more reliable than doing it with Awk, such as jq:
curl -s 'https://api.github.com/users/lambda' | jq -r '.name'
You can also do this with tools that are likely already installed on your system, like Python using the json module, and so avoid any extra dependencies, while still havi...
UITableView + Add content offset at top
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I combined this answer with this one:
https://stackoverflow.com/a/9450345/1993937
To make the tableView appear at the top of the content inset, so the space at the top isn't cut off by having the tableView scrolled down slightly when the view initially appears. ...