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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...
Custom Drawable for ProgressBar/ProgressDialog
...eclares the colors of the different states:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@android:id/background">
<shape>
<gradient
android:startColor="#000001"
android...
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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iPhone App 开发第一步：从零到真机调试HelloWorld - 更多技术 - 清泛网 - ...
...麻烦。
安装过程我也是网上学来的，可参考此文：http://bbs.weiphone.com/read-htm-tid-1628444.html
要注意几个要点就是：（1）引导的iso要用对，在安装系统之前，因为是amd的机器（intel已经可以装lion了，此处不再讨论），应用...
Sending images using Http Post
I want to send an image from the android client to the Django server using Http Post. The image is chosen from the gallery. At present, I am using list value name Pairs to send the necessary data to the server and receiving responses from Django in JSON. Can the same approach be used for images (wit...
Why does my JavaScript code receive a “No 'Access-Control-Allow-Origin' header is present on the req
...
If I understood it right you are doing an XMLHttpRequest to a different domain than your page is on. So the browser is blocking it as it usually allows a request in the same origin for security reasons. You need to do something different when you want to do a cross-doma...
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...
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...
python: Change the scripts working directory to the script's own directory
... get a shorter version by using sys.path[0].
os.chdir(sys.path[0])
From http://docs.python.org/library/sys.html#sys.path
As initialized upon program startup, the first item of this list,
path[0], is the directory containing the script that was used to
invoke the Python interpreter
...
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...