Rails - Nov 2008 - Validation on array checkbox in Model

Hi,

I am using array ''sub_id[]'' for multiple checkbox,
i want to place validations on all array ''sub_ids[]'' checbox
in model just
like other validations.



 <% for e in @subjects do -%>
  <input type="checkbox" name="sub_ids[]" id="<%=
e.id %>" value="<%e.id%>"<% if
@book.subjects.include? e %> checked="checked"<%end%>>
  <label for="<%= e.id %>"><%= e.name
%></label>
 <% end %>



MODEL

class Book < ActiveRecord::Base
    has_and_belongs_to_many :subjects
     validates_presence_of:title
    validates_numericality_of:price
    validate :at_least_one_checkbox_was_ticked

protected
    def at_least_one_checkbox_was_ticked
    unless params[:sub_ids[]].nil?
        end
  end

  end


I''m using only two models book and subject.

thanx in adv.

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