[Rails] Re: set a progressive number.

You want to use self.class.count.

Self is a reference to the object it's self (in your case, an instance
of FirePrevention), self.class is reference to the class.

On Jun 16, 9:32 pm, Mauro <mrsan...@gmail.com> wrote:
> On 16 June 2011 21:24, Walter Lee Davis <wa...@wdstudio.com> wrote:
>
>
>
> > On Jun 16, 2011, at 4:15 PM, Mauro wrote:
>
> >> I want to assign a progressive number to an attribute.
> >> I think that I can do this in the model
>
> >> class Model < ActiveRecord::Base
> >> before_validation(:on => :create) do
> >>  attribute = Model.count + 1
>
> >> But there is no method count for Model.
>
> > Is Model just an example, or did you use that as your model name?
>
> The real code is:
>
> class FirePrevention < ActiveRecord::Base
>   default_scope :order => 'practice_number ASC'
>   before_validation(:on => :create) do
>     practice_number = self.count + 1
>   end
>
> It says undefined method count...........

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