如何用ruby安全地用下划线替换所有空格？
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how to safely replace all whitespaces with underscores with ruby?
提问by rugbert
This works for any strings that have whitespaces in them
这适用于任何包含空格的字符串
str.downcase.tr!(" ", "_")
but strings that dont have whitespaces just get deleted
但是没有空格的字符串会被删除
So "New School" would change into "new_school" but "color" would be "", nothing!
所以“New School”会变成“new_school”但“color”会变成“”，什么都没有！
采纳答案by rwilliams
回答by Sampat Badhe
with space
有空间
str = "New School"
str.parameterize.underscore
=> "new_school"
without space
没有空间
str = "school"
str.parameterize.underscore
=> "school"
Edit :- also we can pass '_' as parameter to parameterize.
编辑：-我们也可以将“_”作为参数传递给参数化。
with space
有空间
str = "New School"
str.parameterize('_')
=> "new_school"
without space
没有空间
str = "school"
str.parameterize('_')
=> "school"
EDIT:
编辑：
For Rails 5 and above, use str.parameterize(separator: '_')
对于 Rails 5 及更高版本，请使用 str.parameterize(separator: '_')
回答by Zack Xu
If you're interested in getting a string in snake case, then the proposed solution doesn't quite work, because you may get concatenated underscores and starting/trailing underscores.
如果您有兴趣在蛇案例中获取字符串，那么建议的解决方案不太适用，因为您可能会得到连接的下划线和起始/尾随下划线。
For example
例如
1.9.3-p0 :010 > str= " John Smith Beer "
=> " John Smith Beer "
1.9.3-p0 :011 > str.downcase.tr(" ", "_")
=> "__john___smith_beer_"
This solution below would work better:
下面的这个解决方案会更好：
1.9.3-p0 :010 > str= " John Smith Beer "
=> " John Smith Beer "
1.9.3-p0 :012 > str.squish.downcase.tr(" ","_")
=> "john_smith_beer"
squish is a String method provided by Rails
squish 是 Rails 提供的 String 方法
回答by theterminalguy
If you are using rails 5 and above you can achieve the same thing with
如果您使用的是 rails 5 及更高版本，则可以使用
str.parameterize(separator: '_')
回答by br3nt
Old question, but...
老问题，但是...
For allwhitespace you probably want something more like this:
对于所有空白，您可能想要更像这样的东西：
"hey\t there world".gsub(/\s+/, '_') # hey_there_world
This gets tabs and new lines as well as spaces and replaces with a single _.
这将获取制表符和新行以及空格并替换为单个_.
The regex can be modified to suit your needs. E.g:
可以修改正则表达式以满足您的需要。例如：
"hey\t there world".gsub(/\s/, '_') # hey__there___world
回答by Michael Durrant
str.downcase.tr(" ", "_")
Note: No "!"
注意：没有“！”
回答by Trip
str = "Foo Bar"
str.tr(' ','').underscore
=> "foo_bar"
回答by randomuser
You can also do str.gsub(" ", "_")
你也可以做 str.gsub(" ", "_")
