Rails - May 2006 - Is there a method for incrementing string names?!?

Hello,
I have model which has a property named "name", I want to append a
number to the end of the name when there is similar name in db.

name, name1, name2...

Is there a ready to use method in ruby and/or rails for doing so?

Thanks in advance,
- Dunnil

Check out String#next

-- 
Posted via http://www.ruby-forum.com/.

I found my answer on the ruby-talk by C Erler [1]:

class String
  def inc
    parts =3D scan(/^(.*\D)?(\d+)?$/).first
    "#{parts.first}#{parts.last.to_i + 1}"
  end
end

[1] http://www.ruby-talk.org/cgi-bin/scat.rb/ruby/ruby-talk/192523


On 5/12/06, Daniel Burkes <dburkes@netable.com>
wrote:
> Check out String#next
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

Human Dunnil wrote:
> I found my answer on the ruby-talk by C Erler [1]:
> 
> class String
>  def inc
>    parts =3D scan(/^(.*\D)?(\d+)?$/).first
>    "#{parts.first}#{parts.last.to_i + 1}"
>  end
> end
> 
> [1] http://www.ruby-talk.org/cgi-bin/scat.rb/ruby/ruby-talk/192523
> 
> 
> On 5/12/06, Daniel Burkes 
> <dburkes@netable.com> wrote:
>> Check out String#next
Why didn''t you like Daniel''s answer?

irb(main):003:0> a = "name1"
=> "name1"
irb(main):004:0> a.next
=> "name2"
irb(main):005:0> a.next.next
=> "name3"

It seems to be exactly what you were asking for.

-- 

Ray

On May 12, 2006, at 3:55 PM, Ray Baxter wrote:
> Human Dunnil wrote:
>> I found my answer on the ruby-talk by C Erler [1]:
>> class String
>>  def inc
>>    parts =3D scan(/^(.*\D)?(\d+)?$/).first
>>    "#{parts.first}#{parts.last.to_i + 1}"
>>  end
>> end
>> [1] http://www.ruby-talk.org/cgi-bin/scat.rb/ruby/ruby-talk/192523
>> On 5/12/06, Daniel Burkes <dburkes@netable.com> wrote:
>>> Check out String#next
>
> Why didn''t you like Daniel''s answer?
>
> irb(main):003:0> a = "name1"
> => "name1"
> irb(main):004:0> a.next
> => "name2"
> irb(main):005:0> a.next.next
> => "name3"
>
> It seems to be exactly what you were asking for.
>
> -- 
>
> Ray

That way it falls on its face when you go above number nine.

ez webrate $ irb
irb(main):001:0> a = ''name9''
=> "name9"
irb(main):002:0> a.next
=> "namf0"


-Ezra

Ezra Zygmuntowicz wrote:
> That way it falls on its face when you go above number nine.
> 
> ez webrate $ irb
> irb(main):001:0> a = ''name9''
> => "name9"
> irb(main):002:0> a.next
> => "namf0"
Hah! Ruby has surprised me.

Here are three more good ones:

irb(main):012:0> a = "name-9"
=> "name-9"
irb(main):013:0> a.next
=> "namf-0"
irb(main):014:0> a = "name-"
=> "name-"
irb(main):015:0> a.next
=> "namf-"
irb(main):018:0> a = "----"
=> "----"
irb(main):019:0> a.next
=> "---."

Thanks, I''ll be careful with next.

-- 

Ray