Ruby 将字符串转换为符号
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Ruby turn string into symbol
提问by Killerpixler
I want to make a view helper that has a size argument ( e.g. func(size)). The issue is that this size has to be used in the function as a symbol. For example, if I pass in 'medium'into the funcI need it to be converted to :medium.
我想制作一个具有大小参数（例如func(size)）的视图助手 。问题是这个大小必须在函数中用作符号。例如，如果我通过在'medium'进入func予需要它转换为:medium。
How do I do this?
我该怎么做呢？
回答by Toby L Welch-Richards
There are a number of ways to do this:
有多种方法可以做到这一点：
If your string has no spaces, you can simply to this:
如果您的字符串没有空格，您可以简单地这样做：
"medium".to_sym => :medium
"medium".to_sym => :medium
If your string has spaces, you should do this:
如果你的字符串有空格，你应该这样做：
"medium thing".gsub(/\s+/,"_").downcase.to_sym => :medium_thing
"medium thing".gsub(/\s+/,"_").downcase.to_sym => :medium_thing
Or if you are using Rails:
或者，如果您使用的是 Rails：
"medium thing".parameterize.underscore.to_sym => :medium_thing
"medium thing".parameterize.underscore.to_sym => :medium_thing
References: Convert string to symbol-able in ruby
回答by konsolebox
You can convert a string to symbol with this:
您可以使用以下方法将字符串转换为符号：
string = "something"
symbol = :"#{string}"
回答by emartini
Or just
要不就
a = :'string'
# => :string
