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Run a callback only if an attribute has changed in Rails
... # ...
end
end
The commit that changed ActiveRecord::Dirty is here: https://github.com/rails/rails/commit/16ae3db5a5c6a08383b974ae6c96faac5b4a3c81
Here is a blog post on these changes: https://www.ombulabs.com/blog/rails/upgrades/active-record-5-1-api-changes.html
Here is the summary I made...
What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters?
...ed normalization, some characters still require multiple code points. See: http://www.unicode.org/standard/where/
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Get city name using geolocation
...me="viewport" content="initial-scale=1.0, user-scalable=no"/>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Reverse Geocoding</title>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script> ...
Rails raw SQL example
...an be done with raw_connection, prepare, and exec_prepared as described in https://stackoverflow.com/a/13806512/178651
You can also put raw SQL fragments into ActiveRecord relational queries: http://guides.rubyonrails.org/active_record_querying.html
and in associations, scopes, etc. You could proba...
ZSH complains about RVM __rvm_cleanse_variables: function definition file not found
...better than creating the files and deleting them at every login.
(source: http://www.csse.uwa.edu.au/programming/linux/zsh-doc/zsh_23.html)
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Installing Python 3 on RHEL
...manually:
Download (there may be newer releases on Python.org):
$ wget https://www.python.org/ftp/python/3.4.3/Python-3.4.3.tar.xz
Unzip
$ tar xf Python-3.*
$ cd Python-3.*
Prepare compilation
$ ./configure
Build
$ make
Install
$ make install
OR if you don't want to overwrite the pyth...
Angularjs minify best practice
I'm reading http://www.alexrothenberg.com/2013/02/11/the-magic-behind-angularjs-dependency-injection.html and
it turned out that angularjs dependency injection has problems if you minify your javascript
so I'm wondering if instead of
...
Thread Safety in Python's dictionary
...a lock here will add almost no overhead, and will give you peace of mind.
http://effbot.org/pyfaq/what-kinds-of-global-value-mutation-are-thread-safe.htm has more details.
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Is gcc 4.8 or earlier buggy about regular expressions?
...
it will print 1 2 3
you may read the sregex_token_iterator reference in:
http://en.cppreference.com/w/cpp/regex/regex_token_iterator
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Fast Bitmap Blur For Android SDK
...implementation, the crash does not occur.
/**
* Stack Blur v1.0 from
* http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
* Java Author: Mario Klingemann <mario at quasimondo.com>
* http://incubator.quasimondo.com
*
* created Feburary 29, 2004
* Android port : Yahel Bouaz...