Rails - Jun 2006 - Possible to check if form field is required?

Hi list,
is it possible to check if form field will be required when form is 
submitted (through validates_presence_of or some other validates_* 
method)? I could do this manually but it doesn''t seems to me very DRY.

For example, I would like to be able to dynamically add asterisk with 
some helper method if city is required here:

City*: <%= text_field ''accomodation'',
''city'' %>

thanks for answer,
Bojan Mihelac


-- 
Bojan Mihelac
Informatika Mihelac, Bojan Mihelac s.p.  |  www.informatikamihelac.com
-> tools, scripts, tricks from our code lab: http://source.mihelac.org

Bojan Mihelac wrote:
> Hi list,
> is it possible to check if form field will be required when form is 
> submitted (through validates_presence_of or some other validates_* 
> method)? I could do this manually but it doesn''t seems to me very
DRY.
> 
> For example, I would like to be able to dynamically add asterisk with 
> some helper method if city is required here:
> 
> City*: <%= text_field ''accomodation'',
''city'' %>
> 
> thanks for answer,
> Bojan Mihelac
> 
> 
Solution would be to add code before each validation class methods which 
would mark this field as required, for example:

module ActiveRecord

   module Validations
     module ClassMethods
       alias :real_validates_presence_of :validates_presence_of unless 
method_defined?(:real_validates_presence_of)
       def validates_presence_of(*attr_names)
         self.add_required_field(attr_names)
         real_validates_presence_of(attr_names)
       end
     end
   end
end

I tested that and it works, but I am not sure if that''s smartest way to
do it (I know that validations can be conditional). Anyone would like to 
comment?

Bojan Mihelac

-- 
Bojan Mihelac
Informatika Mihelac, Bojan Mihelac s.p.  |  www.informatikamihelac.com
-> tools, scripts, tricks from our code lab: http://source.mihelac.org