Undefined method frustration

Hello Everyone,
I just don’t understand why I can’t do this. I have a table with one
column set as serialize. In the form I want three check boxes with two
or more text fields each, so that when the check boxes are selected
the text fields are saved in the serialized column. Something like:
validation2: warning
error

validation4: warning
error

The validation would then be removed according to the checkboxes.
Does this seem possible? What do I need to do to resolve the undefined
method error?

Is there some documentation on this??
Thanks,
jeff

Here is what I’m doing:
View:
<input type=“checkbox” name=“validation_ids[]” value=“1” <%if
@attradio.validations[1] %>checked=“checked”<% end %> >Must select one
Warning

<%= text_field ‘attradio’, ‘warning1’ %>

Controller:
def edit
@attradio = Attradio.find(params[:id])
render(:layout => false)
end

def update
@attradio = Attradio.find(params[:id])
@attglobal = @item.attglobal
@attradio.validations = params[:warning1] if params[:validation_ids]
== ‘1’
if @attradio.update_attributes(params[:attradio])
flash[:notice] = ‘Attradio was successfully updated.’
redirect_to :controller => ‘items’, :action => ‘edit_form’, :id
=> @attradio.item_id
else
render :action => ‘edit’
end
end