Rails - May 2007 - Rails model validation: Can I create my own validations???

Hi,

Is it possible to create my own validations within the Rails model
validation framework?

In particular I''m interesting in being able to create a global (i.e.
not
associated with a particular field) business logic validation exception(s)
to pass back to the controller.  They could then be listed on the View as an
exception error, but not associated with a particular field.

I''m thinking for higher level business logic rule exceptions like this
it
may be better doing it the above way as opposed to creating an exception (
e.g. businessLogic exception class) - but any ideas/comments welcome on
this.

Tks
Greg

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all rails model validators (ie. validates_uniqueness_of) are based on
validates_each

so all you have to do is

def self.validates_something(*args)
  validates_each(*args){|column|
    errors.add(blah blah blah) if not something
  }
end

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

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You can add any validation logic you like to the validate method on
any active model class.  It can validate any combination of attributes
of the object.

If you are wanting to add new meta-programming methods like
validate_presence_of that takes some additional digging I have not
done yet.

Michael



On May 22, 8:05 pm, "Greg Hauptmann"
<greg.hauptmann.r...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi,
>
> Is it possible to create my own validations within the Rails model
> validation framework?
>
> In particular I''m interesting in being able to create a global
(i.e. not
> associated with a particular field) business logic validation exception(s)
> to pass back to the controller.  They could then be listed on the View as
an
> exception error, but not associated with a particular field.
>
> I''m thinking for higher level business logic rule exceptions like
this it
> may be better doing it the above way as opposed to creating an exception (
> e.g. businessLogic exception class) - but any ideas/comments welcome on
> this.
>
> Tks
> Greg

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On 5/24/07, MichaelLatta <lattam-ee4meeAH724@public.gmane.org>
wrote:
>
> If you are wanting to add new meta-programming methods like
> validate_presence_of that takes some additional digging I have not
> done yet.
>
> Michael
Most of those just wrap #validates_each, which is documented.

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How does this look (I''m not at my rails PC at the moment)?  i.e.
regarding
the use of Global (not attribute specific) validations within Model

  ---------------------------------------------------------
  class Person < ActiveRecord::Base
    protected
      def validate_on_create
          if !complex_business_logic_passes?
             errors.add_to_base("complex business logic failed")
          end
      end
      def complex_business_logic_passes?
          ...<put complex business logic here>
          return result # true if passes
      end
  end
  ---------------------------------------------------------
  <body>
      Business Logic Errors = <%= error_message_on "object",
"base" %>
  </body>

  ---------------------------------------------------------




On 5/24/07, George <george.ogata-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
>
> On 5/24/07, MichaelLatta <lattam-ee4meeAH724@public.gmane.org> wrote:
> >
> > If you are wanting to add new meta-programming methods like
> > validate_presence_of that takes some additional digging I have not
> > done yet.
> >
> > Michael
>
> Most of those just wrap #validates_each, which is documented.
>
> >
>
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