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How to comment lines in rails html.erb files? [duplicate]

Am a newbie to rails , please let me know the way to comment out a single line and also to comment out a block of lines in *.html.erb files. ...
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Regular expression for a hexadecimal number?

How do I create a regular expression that detects hexadecimal numbers in a text? 11 Answers ...
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JPA CascadeType.ALL does not delete orphans

I am having trouble deleting orphan nodes using JPA with the following mapping 11 Answers ...
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Android Json and null values

How can I detect when a json value is null? for example: [{"username":null},{"username":"null"}] 6 Answers ...
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How to run Nginx within a Docker container without halting?

I have Nginx installed on a Docker container, and am trying to run it like this: 9 Answers ...
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Smarty中date_format日期格式化详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术

Smarty中date_format日期格式化详解在php的smarty模板中date_format是对由php提供过来的时间秒进行转换成日期了,那么date_format函数到底怎么用有什么格式,我们一起来看看。...在php的smarty模板中date_format是对由php提供过来的时间秒进行...
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How to get WordPress post featured image URL

I am using this function to get the featured images: 20 Answers 20 ...
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Command line for looking at specific port

Is there a way to examine the status of a specific port from the Windows command line? I know I can use netstat to examine all ports but netstat is slow and looking at a specific port probably isn't. ...
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Python Graph Library [closed]

I'm writing a python application that will make heavy use of a graph data structure. Nothing horribly complex, but I'm thinking some sort of graph/graph-algorithms library would help me out. I've googled around, but I don't find anything that particularly leaps out at me. ...
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std::function vs template

Thanks to C++11 we received the std::function family of functor wrappers. Unfortunately, I keep hearing only bad things about these new additions. The most popular is that they are horribly slow. I tested it and they truly suck in comparison with templates. ...