Rails - Nov 2008 - Validations 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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On 7 Nov 2008, at 12:50, babar wrote:
> 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

That''s not how you could do it. You don''t validate against  
params[:sub_ids], you validate against a property of the model (ie  
subjects.size)

Fred


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