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How do you write a migration to rename an ActiveRecord model and its table in Rails?
I'm terrible at naming and realize that there are a better set of names for my models in my Rails app. Is there any way to use a migration to rename a model and its corresponding table?
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Is it abusive to use IDisposable and “using” as a means for getting “scoped behavior” for exception
...
I don't think so, necessarily. IDisposable technically is meant to be used for things that have non-managed resources, but then the using directive is just a neat way of implementing a common pattern of try .. finally { dispose }.
A purist would argue 'yes - it's...
Optimizing away a “while(1);” in C++0x
...sume we have the following loops,
where count and count2 are global variables (or have had their address
taken), and p is a local variable, whose address has not been taken:
for (p = q; p != 0; p = p -> next) {
++count;
}
for (p = q; p != 0; p = p -> next) {
++count2;
}
Coul...
中文网（自研/维护）拓展 · App Inventor 2 中文网
...Disconnect()
Close the socket
SendBinaryData(listBytes)
参考原版BLE源码中的字节列表参数
SendData(data)
Send data through the socket to the server
Clipboard
实现剪贴板的复制粘贴功能。详细用法及步骤请参考这里。
可跨屏...
How to install the Raspberry Pi cross compiler on my Linux host machine?
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arm-linux-gnueabihf-raspbian-linux/install/arm-linux-gnueabihf/libc --enable-languages=c,c++,fo
rtran --disable-multilib --with-arch=armv6 --with-tune=arm1176jz-s --with-fpu=vfp --with-float=
hard --with-pkgversion='crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08' --with-bugurl=
https:/...
How does having a dynamic variable affect performance?
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@Eric, can I trouble you to point me to a previous blog post of yours where you talk about implicit conversions of short, int, etc? As I recall you mentioned in there how/why using dynamic with Convert.ToXXX causes the compiler to fire up. ...
Check whether a path is valid in Python without creating a file at the path's target
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tl;dr
Call the is_path_exists_or_creatable() function defined below.
Strictly Python 3. That's just how we roll.
A Tale of Two Questions
The question of "How do I test pathname validity and, for valid pathnames, the existence or writability of those paths?" is ...
Best architectural approaches for building iOS networking applications (REST clients)
...creative job. You should always choose the most straightforward and extensible architecture, which will be clear for any developer, who begin to work on your project or for other developers in your team, but I agree, that there can be a "good" and a "bad" architecture.
You said: collect the most in...
App Inventor 2 扩展 · App Inventor 2 中文网
... Camera or LocationSensor) or services on the Web (like Twitter or FusionTables). App Inventor includes a large collection of components, and the App Inventor development team adds new capabilities to the system by implementing new components.
There have been many requests to include additional f...