Hi Thanks for replying.I could do it partially with the following modifications to my models and views
message_thread ==================== has_many messages accepts_nested_attributes_for :messages message ============== belongs_to message_thread has_many :document_messages has_many :documents, :through => :document_messages accepts_nested_attributes_for :documents,:reject_if => lambda {|a| a[:attachment].blank?} validates_presence_of :subject No other change. But the problem is from the view I am not selecting any file for upload and not entering values for 'subject' . So surely the validation will fail and rerender my new action . My 'create' action like def create @message_thread = MessageThreads.new(params[:message_thread]) if @message_thread.save flash[:notice] = "Message sent successfully" redirect_to home_url else flash.now[:error] = @message_thread.errors.full_messages.join("<br />") render :action => 'new' end end The problem is now the file_field disappears. What might be the cause?I am struggling with this for hours.Please help Thanks -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-t...@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.