Ruby on rails: replace camel case with space

Question

I want to convert camel case words like camelCase to CAMEL CASE. I tried the approach mentioned here.

@q = params[:promo].underscore.humanize.upcase

But this gives me CAMELCASE and not CAMEL CASE same result on using:

@q = params[:promo].gsub(/[a-zA-Z](?=[A-Z])/, '\0 ').downcase

EDIT: the url contains /camelCase but on using params[:promo], the camel case is not retained and @q is camelcase

Your approach is correct and returns correct result in my console. Are you sure you your `params[:promo]` is `camelCase`, not `camelcase`? — BroiSatse, Feb 06 '14 at 11:34
@BroiSatse: You are right, the url has `/camelCase`. But on using `params[:promo]` it becomes `camelcase`. — nish, Feb 06 '14 at 11:36
Could you check url headers for given request? `request.original_url` — BroiSatse, Feb 06 '14 at 11:51
Do you have anything like `route_downcaser` installed. Also, what operating system is your server running on? — BroiSatse, Feb 06 '14 at 12:00
@BroiSatse: i am not aware of any downcaser. But what I did was, used the required part from `request.original_url` and apllied the solution mentioned in the question. Thanks for pointing me in the right direction — nish, Feb 06 '14 at 12:04

score 34 · Answer 1 · answered Feb 06 '14 at 14:31

34

»  'camelCase'.underscore.humanize.upcase
=> "CAMEL CASE"

answered Feb 06 '14 at 14:31

itsnikolay

Uri strings must be a format with dashes and underscores (not with any kind of cammelcase) also its SEO well format – itsnikolay Feb 06 '14 at 14:36

score 7 · Answer 2 · edited Apr 13 '16 at 15:35

7

If anyone need something like 'CamelCase' to 'Camel Case' can use

'CamelCase'.underscore.split('_').collect{|c| c.capitalize}.join(' ')

Or 'CamelCase' to 'camel case'

'CamelCase'.underscore.split('_').join(' ')

Or 'CamelCase' to 'Camel case'

'CamelCase'.underscore.humanize

N.B: This solution is rails specific, it does not work in ruby without ActiveSupport.

edited Apr 13 '16 at 15:35

Paul Kaplan

answered Apr 24 '15 at 06:18

6

`'CamelCase'.underscore.titleize` also returns "Camel Case" - a lot easier than your suggestion – davegson May 24 '18 at 10:32

score 4 · Answer 3 · answered Feb 06 '14 at 11:38

4

Just replace your upper characters fist with itself prepended with a space and then make everything uppercase

'camelCase'.gsub(/[A-Z]/, ' \0').upcase

answered Feb 06 '14 at 11:38

peter

score 1 · Answer 4 · answered Jul 28 '14 at 20:27

1

'camelCase'.split(/(?=[A-Z])/).join(' ').upcase

answered Jul 28 '14 at 20:27

konyak

4 Answers4