Rails - Jun 2005 - validation question

I think that "dynamic validation" kinda describes what I''m
trying to do.

I have a Score class, which belongs_to :rating

Rating has min and max methods which return the correct values for a 
particular type of rating.  (these are usually 0/10, 0/100, etc)

Essentially, what I want Score to validate as, conceptually, is this...

class Score < ActiveRecord::Base
   belongs_to :rating
   validates_inclusion_of :score, :in => self.rating.min..self.rating.max
end

That way, for any particular score, if someone attempts to enter say 
"50" for a score whose rating only wants 0..10 - I can not save that
score.

Does that make sense?  Is there a way to do what I want w/ validations, 
or is there a more correct place for it?

-Matt

On Jun 16, 2005, at 11:39 PM, Matt Jankowski wrote:
> I think that "dynamic validation" kinda describes what
I''m trying to
> do.
>
> I have a Score class, which belongs_to :rating
>
> Rating has min and max methods which return the correct values for a 
> particular type of rating.  (these are usually 0/10, 0/100, etc)
>
> Essentially, what I want Score to validate as, conceptually, is this...
>
> class Score < ActiveRecord::Base
>   belongs_to :rating
>   validates_inclusion_of :score, :in => 
> self.rating.min..self.rating.max
> end
>
> That way, for any particular score, if someone attempts to enter say 
> "50" for a score whose rating only wants 0..10 - I can not save
that
> score.
>
> Does that make sense?  Is there a way to do what I want w/ 
> validations, or is there a more correct place for it?
>
> -Matt
You can always define your own validate method [1] and do anything the 
validation macros won''t do in there.  Like:

def validate
   errors.add("score", "no good") unless 
(self.rating.min..self.rating.max).include?(self.score)
end

And so on.  Back in the early days we were walking to school up hill 
both ways and writing our own validate methods!  You''ve got it too easy
these days with your newfangled convenience macros ;)

[1] http://rails.rubyonrails.com/classes/ActiveRecord/Validations.html


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