Replace umlaute (äüö) for SEO link in rails - best way

Question

I'm using the permalink_fu plugin to create permalinks from titles. My problem is: If the title contains german characters, they are just replaced with '_'.

What I need is something that replaces ä with ae ü with ue ö with oe

I fount String.tr but the problem here is that it replaces 1 character with 1 replacement, so it would work for replacing

é with e ø with o

etc.

Does anyone have a nice and clean solution for that?

Thanks

Duplicate of http://stackoverflow.com/questions/225471/how-do-i-replace-accented-latin-characters-in-ruby — James A. Rosen, May 18 '09 at 22:05
Actually, I take that back. You seem to want to replace only select characters, not all. — James A. Rosen, May 18 '09 at 22:07
What version of Ruby are you using? 1.8 was barely Unicode aware. 1.9.2 is much, much, better and provides some good code-set translation tools which are aware of multi-byte characters, instead of being tied to bytes. — the Tin Man, Dec 30 '10 at 22:24

eikes · Answer 1 · 2017-05-03T11:31:16.620

Look at transliterate and parameterize (with transliterations in locales/de.yml):

http://api.rubyonrails.org/classes/ActiveSupport/Inflector.html#method-i-transliterate

I18n.transliterate("Über der Höhenstraße")
 => "Ueber der Hoehenstrasse"

http://api.rubyonrails.org/classes/ActiveSupport/Inflector.html#method-i-parameterize

"Über der Höhenstraße".parameterize
 => "ueber-der-hoehenstrasse"

If you don't want to write the transliterations yourself, you can install the rails-i18n gem.

score 9 · Answer 2 · answered May 18 '09 at 17:32

I have written a small Library called Asciify for exactly that purpose

$ sudo gem install asciify

Usage:

#!/bin/ruby
require "asciify"

"Lücke".asciify   #=> "Luecke"

You can provide a YAML-file for custom mappings like so:

translator = Asciify.new("/path/to/mappings.yaml")
output_string = translator.convert("input string")

(see the builtin default mapping for the expected format)

The whole project is quite old, but maybe it does the job you need it to. If not, maybe the source code will be helpful.

Nice. I just posted a PR to it to make it a little easier to use. — Adamantish, Feb 06 '18 at 17:32

score 7 · Accepted Answer · edited Jan 21 '16 at 13:58

7

Use String.gsub():

"ich bin doch nicht blöd, mann!".gsub(/[äöü]/) do |match|
    case match
        when "ä"
          'ae'
        when "ö"
          'oe'
        when "ü"
          'ue'
    end
end

Of course, the lookup can be improved by using a lookup table, but the principle should be clear.

edited Jan 21 '16 at 13:58

mb21

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answered May 18 '09 at 17:27

David Schmitt

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When I do this, I get `invalid multibyte char (US-ASCII)` – Martin Thoma Dec 10 '13 at 14:02
@moose: then you need to fix the locale (specifically LC_CTYPE) under which you are running ruby to be UTF-8. Ruby's locale handling is a cess pit. – David Schmitt Jan 13 '14 at 09:55

score 6 · Answer 4 · edited Jan 21 '16 at 13:48

6

"äöü".gsub('ä','ae').gsub('ö','oe').gsub('ü','ue')

;)

edited Jan 21 '16 at 13:48

mb21

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answered Dec 30 '10 at 21:31

Bijan

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but then again downvote because multiple `sub!`s don't work in ruby1.9 – Christian Oct 15 '12 at 08:57

score 0 · Answer 5 · answered May 18 '09 at 17:29

0

Try String.sub!.

answered May 18 '09 at 17:29

Charlie Martin

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score 0 · Answer 6 · edited May 23 '17 at 12:09

0

I asked a similar question once. It was for JavaScript, and it takes a regex based aproach. Maybe the solution still carries some value for you, methodologically speaking.

edited May 23 '17 at 12:09

Community

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answered May 18 '09 at 17:31

Tomalak

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score -1 · Answer 7 · edited Jul 22 '12 at 12:55

-1

Try using this: "Ich bin doch nicht böld ähhh ühh öhhh".gsub(/[äöüßÄÖÜ„“§%&–+]/){|t|t.to_xs}

edited Jul 22 '12 at 12:55

Peter DeWeese

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answered Mar 29 '10 at 14:01

steffen

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NoMethodError: undefined method `to_xs' for "ö":String – Tim Kretschmer Jul 19 '15 at 16:35

Replace umlaute (äüö) for SEO link in rails - best way

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