Rails - Aug 2006 - has_and_belongs_to_many with checkboxes

Hello all,

I''m trying to get my head round HABTM, and need to build a checkbox  
list. I have the following models

class Supplier < User

   has_one :supplier_profile, :dependent => :destroy
   has_one :profile, :foreign_key => ''user_id'', :dependent
=> :destroy

end

class SupplierProfile < ActiveRecord::Base
    belongs_to :supplier
   has_and_belongs_to_many :supplier_categories
end

class SupplierCategory < ActiveRecord::Base
   has_and_belongs_to_many :supplier_profiles
end

and I have my link table: supplier_categories_supplier_profiles

I have a controller, suppliers_controller, a snippet of which looks like

   def new
     @supplier = Supplier.new
     @supplier_profile = @supplier.supplier_profile =  
SupplierProfile.new
     @supplier_categories = SupplierCategory.find(:all)
   end

   def create
     @supplier = Supplier.new(params[:supplier])
     @supplier_profile = @supplier.supplier_profile =  
SupplierProfile.new(params[:supplier_profile])

     if @supplier.save
       # flash[:notice] = ''Link was successfully created.''
       # redirect_to :action => ''list''
       render :text => "saved"
     else
       # render :action => ''new''
       render :text => "not saved"
     end
   end

and the checkbox area of my form looks like

<p><label for="url">Category</label><br/>
<% for category in @supplier_categories %>
<p><%=
check_box_tag(''supplier_profile[supplier_category_ids][]'',
category.id) %>
<label for="supplier_profile"><%= category.name
%></label></p>
<% end %>

Basically it''s not saving and I''m not entirely sure why not.
If I
remove the supplier from the new and create methods then it will save  
the supplier_profile with any checked checkboxes but something isn''t  
quite right with the supplier.

Any ideas?

Alastair


------
Alastair Moore
Standards compliant web development with Ruby On Rails, PHP and ASP
www.kozmo.co.uk
07738 399038




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