you really don't want to mix your rendering like that. and there is no
need to use :update => 'mypropForm' in the ajax call in your view, as
you are doing a page.replace_html.
you're making an ajax request, so instead of redirec_to, you should do
render :update do |page|
if @proposal.save
page.redirect_to ...
else
page.replace_html 'mypropForm', :partial => 'myprop_form'
end
end
