Rails - Jun 2006 - ActiveRecord validations and FormBuilder

Hi,

I''m writing my own FormBuilder and I wanted to put an asterisk or  
something next to any required fields.  The Builder has access to the  
AR object, is there any method I can call on the AR object that will  
tell me whether or not a particular field is required?  Failing that,  
can I access the complete list of validations so I can look through  
it for instances of validates_presence_of?

Jon

On 5-jun-2006, at 14:25, Jon Evans wrote:
> Hi,
>
> I''m writing my own FormBuilder and I wanted to put an asterisk or
> something next to any required fields.  The Builder has access to  
> the AR object, is there any method I can call on the AR object that  
> will tell me whether or not a particular field is required?   
> Failing that, can I access the complete list of validations so I  
> can look through it for instances of validates_presence_of?
Validations cannot be introspected, primarily because they might be  
conditional/procedure dependent. A validation might _exist_ or
might _not_ exist depending on th state of the record.

--
Julian ''Julik'' Tarkhanov
please send all personal mail to
me at julik.nl

You might find the code in my plugin helpful ... Heck, why not just use the
whole thing? :)
http://railsrtv.rubyforge.org/
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Hi Julian,

On 5 Jun 2006, at 19:11, Julian ''Julik'' Tarkhanov wrote:
> On 5-jun-2006, at 14:25, Jon Evans wrote:
>
>> I''m writing my own FormBuilder and I wanted to put an asterisk
or
>> something next to any required fields.  The Builder has access to  
>> the AR object, is there any method I can call on the AR object  
>> that will tell me whether or not a particular field is required?   
>> Failing that, can I access the complete list of validations so I  
>> can look through it for instances of validates_presence_of?
>
> Validations cannot be introspected, primarily because they might be  
> conditional/procedure dependent. A validation might _exist_ or
> might _not_ exist depending on th state of the record.
I guessed as much.

I got round the problem by passing some extra parameters to the  
function:

<% tabular_form_for :user, @user,
                     :required => [:email, :login] do |f| %>

     [...]
     <%= f.text_field :email  %>
     <%= f.text_field :login  %>
     [...]

<% end %>

and each field_helper can see if a required field is being rendered  
by testing @options[:required].include?(field.to_sym).

Jon