英文:
Ruby how to use method parameter embedded in call to another method other than just puts
问题
在Ruby中，我想在调用Net::HTTP的new方法时使用一个输入参数来表示REST动词（比如'Post'），但我不知道如何将这个参数嵌入语句中。我有一个名为restVerb的参数，它在puts "Verb is #{restVerb}"中打印出来没有问题，但在request = Net::HTTP::#{restVerb}.new(uri)中不起作用 - 我得到了undefined method 'request' for Net::HTTP:Class (NoMethodError)，所以显然它没有识别语句中参数的值。我可以使用case语句，但我想使它更通用。我做错了什么？
我尝试过上述语法以及其他一些，比如request = Net::HTTP::restVerb.new(uri)或request = Net::HTTP::$restVerb.new(uri)，我对Ruby还不太熟悉，请对我宽容一些。
英文:
In Ruby I want to use an input parameter for REST verb (like 'Post') in a call to Net::HTTP new but I can't work out how to embed the parameter in the statement. I have the param called restVerb which prints fine in puts "Verb is #{restVerb}" but not in request = Net::HTTP::#{restVerb}.new(uri) - I get undefined method request' for Net::HTTP:Class (NoMethodError)` so it clearly doesn't recognise the parameter's value in the statement. I could use a case statement but wanted to make it more generic. What am I doing wrong?
I've tried the above syntax and a few others like request = Net::HTTP::restVerb.new(uri) or request = Net::HTTP::$restVerb.new(uri) I'm new to Ruby so be gentle with me please.
答案1
得分: 1
使用 Object.const_get 将字符串转换为实际常量：
klass = Object.const_get("Net::HTTP::#{restVerb}")
=> Net::HTTP::Post
klass.new(uri)
=> #<Net::HTTP::Post POST>
英文:
Use Object.const_get to convert a string to an actual constant:
klass = Object.const_get("Net::HTTP::#{restVerb}")
=> Net::HTTP::Post
klass.new(uri)
=> #<Net::HTTP::Post POST>
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