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Shane

2007-Aug-21 17:14 UTC

Creating/modifying a class in Rails

Forgive me if this is a really stupid question, I''ve only started
learning Rails.

After some Googling and talking to some people, I still don''t know how
to do this.

Basically, what I want to do is to be able to create a class that I
can use anywhere in my application, kind of like the way you can use a
method anywhere when you define it in the ApplicationHelper module.

Specifically, I don''t like using methods like truncate(string, length)
and h(string), and I''d much rather use them in the form of
string.truncate(length) and string.h(),

Could anybody tell me how to do this? Thanks in advance.


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jemminger

2007-Aug-21 18:55 UTC

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Re: Creating/modifying a class in Rails

one way is to define them on the String class:

class String
  def h
    ...do stuff...
  end
end

save this in a file somewhere, e.g. lib/my_string_methods.rb

and include it in your environment.rb
require File.dirname(__FILE__) + "/../lib/my_string_methods"

On Aug 21, 1:14 pm, Shane <the...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Forgive me if this is a really stupid question, I''ve only started
> learning Rails.
>
> After some Googling and talking to some people, I still don''t know
how
> to do this.
>
> Basically, what I want to do is to be able to create a class that I
> can use anywhere in my application, kind of like the way you can use a
> method anywhere when you define it in the ApplicationHelper module.
>
> Specifically, I don''t like using methods like truncate(string,
length)
> and h(string), and I''d much rather use them in the form of
> string.truncate(length) and string.h(),
>
> Could anybody tell me how to do this? Thanks in advance.

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jemminger

2007-Aug-21 19:14 UTC

head link

Re: Creating/modifying a class in Rails

also keep in mind that rails defines some String helpers already.
e.g. to truncate a string, you could do

  ''this is my string''.first(5) # = ''this ''

or use core ruby methods:
  ''this is my string''[0,5] # = ''this ''


On Aug 21, 2:55 pm, jemminger
<jemmin...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> one way is to define them on the String class:
>
> class String
>   def h
>     ...do stuff...
>   end
> end
>
> save this in a file somewhere, e.g. lib/my_string_methods.rb
>
> and include it in your environment.rb
> require File.dirname(__FILE__) + "/../lib/my_string_methods"
>
> On Aug 21, 1:14 pm, Shane
<the...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > Forgive me if this is a really stupid question, I''ve only
started
> > learning Rails.
>
> > After some Googling and talking to some people, I still don''t
know how
> > to do this.
>
> > Basically, what I want to do is to be able to create a class that I
> > can use anywhere in my application, kind of like the way you can use a
> > method anywhere when you define it in the ApplicationHelper module.
>
> > Specifically, I don''t like using methods like
truncate(string, length)
> > and h(string), and I''d much rather use them in the form of
> > string.truncate(length) and string.h(),
>
> > Could anybody tell me how to do this? Thanks in advance.

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Paul Hoehne

2007-Aug-21 19:19 UTC

head link

Re: Creating/modifying a class in Rails

You should be able to created your class under the lib directory.

On Aug 21, 2007, at 1:14 PM, Shane wrote:
>
> Forgive me if this is a really stupid question, I''ve only started
> learning Rails.
>
> After some Googling and talking to some people, I still don''t know
how
> to do this.
>
> Basically, what I want to do is to be able to create a class that I
> can use anywhere in my application, kind of like the way you can use a
> method anywhere when you define it in the ApplicationHelper module.
>
> Specifically, I don''t like using methods like truncate(string,
length)
> and h(string), and I''d much rather use them in the form of
> string.truncate(length) and string.h(),
>
> Could anybody tell me how to do this? Thanks in advance.
>
>
> >
>
>

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Shane

2007-Aug-21 19:19 UTC

head link

Re: Creating/modifying a class in Rails

Thanks a lot! This does exactly what I was looking for.

It''s annoying that I have restart script/server everytime I make a
change, but it''ll do. Thanks!

On Aug 21, 7:55 pm, jemminger
<jemmin...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> one way is to define them on the String class:
>
> class String
>   def h
>     ...do stuff...
>   end
> end
>
> save this in a file somewhere, e.g. lib/my_string_methods.rb
>
> and include it in your environment.rb
> require File.dirname(__FILE__) + "/../lib/my_string_methods"
>
> On Aug 21, 1:14 pm, Shane
<the...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > Forgive me if this is a really stupid question, I''ve only
started
> > learning Rails.
>
> > After some Googling and talking to some people, I still don''t
know how
> > to do this.
>
> > Basically, what I want to do is to be able to create a class that I
> > can use anywhere in my application, kind of like the way you can use a
> > method anywhere when you define it in the ApplicationHelper module.
>
> > Specifically, I don''t like using methods like
truncate(string, length)
> > and h(string), and I''d much rather use them in the form of
> > string.truncate(length) and string.h(),
>
> > Could anybody tell me how to do this? Thanks in advance.

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Shai Rosenfeld

2007-Aug-22 07:29 UTC

head link

Re: Creating/modifying a class in Rails

> Basically, what I want to do is to be able to create a class that I
> can use anywhere in my application, kind of like the way you can use a
> method anywhere when you define it in the ApplicationHelper module.
as of that:>> You should be able to created your class under the lib directory. 
> Specifically, I don''t like using methods like truncate(string,
length)
> and h(string), and I''d much rather use them in the form of
> string.truncate(length) and string.h(),
> 
> Could anybody tell me how to do this? Thanks in advance.
if you want to define a method for an object (instance method), you''ll 
need to define that in that instance''s class; so, if you want to play 
around with strings, you''ll need to modify that class.


class String
   def truncate(size)
     self[0..size]
     # self is the instance being worked on
   end
end

so now,

"apples".truncate(3) # returns "app"

some more examples:

http://www.donttrustthisguy.com/2005/12/31/ruby-extending-classes-and-method-chaining/
http://rails.aizatto.com/2007/06/01/ruby-and-open-classes/ (scroll down, 
it''s an article)

hope it helps out :)
-- 
Posted via http://www.ruby-forum.com/.

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Exile Exile

2007-Nov-28 11:17 UTC

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Re: Creating/modifying a class in Rails

Shane wrote:> Thanks a lot! This does exactly what I was looking for.
> 
> It''s annoying that I have restart script/server everytime I make a
> change, but it''ll do. Thanks!
If you want to do modification without restarting the server instead of 
using
- require File.dirname(__FILE__) + "/../lib/my_string_methods" put it 
inside Rails::Initializer in your environment.rb using the 
config.load_path directive.

config.load_paths += %W( #{RAILS_ROOT}/lib/<you class folder>)


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

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Rails - Aug 2007 - Creating/modifying a class in Rails

Creating/modifying a class in Rails

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