Rails - Dec 2011 - Model validation and Aray

How to validate a aray in model?

In form I have a multiple select option, that returns a array

(in model I convert array to string and save it to database)

array can only have values
[''A'',''B'',''C'',''D'',''E'','''']

So how can I valdate that some value is not a X or Y ?

The model code is:


   attr_accessor :categories

   def categories
     if self.category
       @categories = self.category.split
    else
      @categories = ['''']
    end
   end

   def categories=(xxx)
     @categories = xxx
     return if xxx.blank?
     self.category = xxx.join(" ")
   end

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On Fri, Dec 16, 2011 at 13:30, Fresh Mix
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> How to validate a aray in model?
> In form I have a multiple select option, that returns a array
> (in model I convert array to string and save it to database)
> array can only have values
[''A'',''B'',''C'',''D'',''E'','''']
> So how can I valdate that some value is not a X or Y ?
Use a custom validator method that looks at the elements.  See:

 
http://guides.rubyonrails.org/active_record_validations_callbacks.html#custom-validators

and use an array of bad elements with a method like so:

  badElts = [:put, :bad, :element, :values, :here]

  def validate record
    record.array_of_stuff.each do |elt|
      record.errors[:name] << "''#{elt}'' is
forbidden" if badElts.include? elt
    end
  end

-Dave

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