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Rails 4 multiple image or file upload using carrierwave
...tm>ex m>t,
post_attachments_attributes: ["avatar", "@original_filename", "@content_type", "@headers", "_destroy", "id"])
end
That's why the accepts_nested_attributes_for is so amazing.
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imp...
Can I combine :nth-child() or :nth-of-type() with an arbitrary selector?
...gt;
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>TEST</title>
<style>
.block {
background: #fc0;
margin-bottom: 10px;
padding: 10px;
}
/* .large > .large-item:n...
Is mathematics necessary for programming? [closed]
... Then you know it's not just numbers. I have two math degrees, and use the content often: boolean algebra to analyze/simplify logic, automata/language theory for DSL construction, algebra for big-O performance analysis, etc.
– joel.neely
Jan 13 '09 at 12:52
...
What is RSS and VSZ in Linux memory management
What are RSS and VSZ in Linux memory management? In a multithreaded environment how can both of these can be managed and tracked?
...
Why doesn't C++ have a garbage collector?
I'm not asking this question because of the merits of garbage collection first of all. My main reason for asking this is that I do know that Bjarne Stroustrup has said that C++ will have a garbage collector at some point in time.
...
常用Linux命令详解（持续更新） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...x命令进行一下详解。logout,shutdown,reboot,useradd,passwd,ls,ll,cd,mkdir,vi,cp,rm,mv,chmod,chown,find,grep,tail,tar,gzip,fdisk,kill,netstat等。一、注销，关机，重启，新建用户、删除用户
1. 注销系统的命令
logout 、m>ex m>it
这两个命令都可以用来退出当前...
Why should I use the keyword “final” on a method parameter in Java?
...ter value itself won't change (even if the object it refers to changes its contents). For those who find that adds to readability, I think it's an entirely reasonable thing to do.
Your point would be more important if anyone were actually claiming that it did keep data constant in a way that it doe...
What new capabilities do user-defined literals add to C++?
...nstead of a constructor call:
#include <bitset>
#include <iostream>
template<char... Bits>
struct checkbits
{
static const bool valid = false;
};
template<char High, char... Bits>
struct checkbits<High, Bits...>
{
static const bool valid = (High == ...
C++ - passing references to std::shared_ptr or boost::shared_ptr
...f I have a function that needs to work with a shared_ptr , wouldn't it be more efficient to pass it a reference to it (so to avoid copying the shared_ptr object)?
What are the possible bad side effects?
I envision two possible cases:
...
What is the difference between shallow copy, deepcopy and normal assignment operation?
...rence to the old data. So you need copy to create a new list with the same contents.
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