how to safely replace all whitespaces with underscores with ruby?

Question

Pass ‘_’ as parameter to parameterize(separator: ‘-‘). For Rails 4 and below, use str.parameterize('_')

with space

str = "New School"
str.parameterize(separator: '_')

=> "new_school"

without space

str = "school"
str.parameterize(separator: '_')

=> "school"

You can also solve this by chaining underscore to parameterize.

with space

str = "New School"
str.parameterize.underscore

=> "new_school"

without space

str = "school"
str.parameterize.underscore

=> "school"