This works for any strings that have whitespaces in them
这适用于任何有空白的字符串。
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“新学校”会变成“新学校”，但是“颜色”会变成“”，什么都没有!
8 个解决方案
#1
#2
74
with space
与空间
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
与空间
str = "New School"
str.parameterize('_')
=> "new_school"
without space
没有空间
str = "school"
str.parameterize('_')
=> "school"
#3
35
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.
如果您感兴趣的是在snake案例中获得一个字符串，那么建议的解决方案并不是很有效，因为您可能会得到连接下划线和开始/结尾下划线。
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提供的字符串方法
#4
7
Old question, but...
老问题,但是……
For all whitespace you probably want something more like this:
对于所有的空格，您可能需要更类似的东西:
"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，并用一个_替换。
The regex can be modified to suit your needs. E.g:
可以修改regex以满足您的需要。例句:
"hey\t there world".gsub(/\s/, '_') # hey__there___world
#5
6
str.downcase.tr(" ", "_")
Note: No "!"
注意:没有“!”
#6
3
If you are using rails 5 and above you can achieve the same thing with
如果您正在使用rails 5或更高版本，那么您也可以使用相同的功能
str.parameterize(separator: '_')
#7
1
You can also do str.gsub(" ", "_")
您也可以使用str.gsub(“”，“_”)
#8
1
str = "Foo Bar"
str.tr(' ','').underscore
=> "foo_bar"
#1
33
The docs for tr! say
tr的文档!说
Translates str in place, using the same rules as String#tr. Returns str, or nil if no changes were made.
I think you'll get the correct results if you use tr without the exclamation.
我认为如果你使用tr而不使用惊叹号，你会得到正确的结果。
#2
74
with space
与空间
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
与空间
str = "New School"
str.parameterize('_')
=> "new_school"
without space
没有空间
str = "school"
str.parameterize('_')
=> "school"
#3
35
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.
如果您感兴趣的是在snake案例中获得一个字符串，那么建议的解决方案并不是很有效，因为您可能会得到连接下划线和开始/结尾下划线。
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提供的字符串方法
#4
7
Old question, but...
老问题,但是……
For all whitespace you probably want something more like this:
对于所有的空格，您可能需要更类似的东西:
"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，并用一个_替换。
The regex can be modified to suit your needs. E.g:
可以修改regex以满足您的需要。例句:
"hey\t there world".gsub(/\s/, '_') # hey__there___world
#5
6
str.downcase.tr(" ", "_")
Note: No "!"
注意:没有“!”
#6
3
If you are using rails 5 and above you can achieve the same thing with
如果您正在使用rails 5或更高版本，那么您也可以使用相同的功能
str.parameterize(separator: '_')
#7
1
You can also do str.gsub(" ", "_")
您也可以使用str.gsub(“”，“_”)
#8
1
str = "Foo Bar"
str.tr(' ','').underscore
=> "foo_bar"