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Undo scaffolding in Rails
...
To generate scaffolding :
rails generate scaffold xyz
To revert scaffolding :
rails destroy scaffold xyz
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Regular Expression to match only alphabetic characters
...hese alphabets will be matched.
Code:
preg_match('/^[A-Z]+$/i', "abcAbc^Xyz", $m);
var_dump($m);
Output:
array(0) {
}
Test case is for OP's comment that he wants to match only if there are 1 or more alphabets present in the input. As you can see in the test case that matches failed because t...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...:sys_enter_*'
"bpftrace -l" 列出所有探测点，并且可以添加搜索项。
探针是用于捕获事件数据的检测点。
提供的搜索词支持通配符如*/?
"bpftrace -l" 也可以通过管道传递给grep，进行完整的正则表达式搜索。
2. Hello World
# bp...
difference between variables inside and outside of __init__()
... print(cls.email, cls.firstname, cls.lastname)
u1 = User(email='abc@xyz', firstname='first', lastname='last')
User.print_var(u1)
In the above code, the User class has 3 global variables, each with value 'none'. u1 is the object created by instantiating this class. The method print_var print...
.prop() vs .attr()
...hem all the time.
Custom attributes would include, for instance, any data-xyz attributes you might put on elements to provide meta-data to your code (now that that's valid as of HTML5, as long as you stick to the data- prefix). (Recent versions of jQuery give you access to data-xyz elements via the...
Rails 3 check if attribute changed
...for each columns. For example catagory for above is changed from 'ABC' to 'XYZ' of @design,
@design.changes # => {}
@design.catagory = 'XYZ'
@design.changes # => { 'catagory' => ['ABC', 'XYZ'] }
For references change in ROR
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Confusion between factor levels and factor labels
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df$f <- factor(df$f, levels=c('a','b','c'),
labels=c('Treatment A: XYZ','Treatment B: YZX','Treatment C: ZYX'))
is telling to R that there is a vector df$f
which you want to transform into a factor,
in which the different levels are coded as a, b, and c
and for which you want the level...
Get list of passed arguments in Windows batch script (.bat)
... can recall the filename.
@echo off
echo main %0, %~0, %~f0
call :myLabel+xyz
exit /b
:MYlabel
echo func %0, %~0, %~f0
exit /b
Output
main test.bat, test.bat, C:\temp\test.bat
func :myLabel+xyz, :myLabel+xyz, C:\temp\test.bat
...
拉里佩奇23条箴言帮你度过创业低谷 - 资讯 - 清泛网 - 专注C/C++及内核技术
...解到一些谷歌正在开展的项目。
它们竟然没有一件是与搜索相关的。它们都是关乎治疗癌症(一个可以清除癌细胞的手环)、产品自动化(无人驾驶汽车只是这里的冰山一角)、Wi-Fi普及(热气球传送Wi-Fi信号的Loon项目)以及其他的解...
Homebrew作者解不出面试题，被Google拒绝 - 创意 - 清泛网 - 专注C/C++及内核技术
...mebrew是Mac上一套流行的软件包管理工具，可以通过命令行搜索、安装、卸载软件包。近日，其作者在进入Google的面试中，因解不出一个二叉 Homebrew是Mac上一套流行的软件包管理工具，可以通过命令行搜索、安装、卸载软件包。...