If I didn't understand wrong.
You need to add some validation into your "sfile" model
like  validates_presence_of :title, :on => :create, :message => "Title
must be filled"

On Jul 31, 6:55 am, Gabriel Bianconi <[email protected]>
wrote:
> I'm new with Rails and I'm creating a simple app.
>
> I have these 3 files and would like to display an error message when
> the form fails, saying the problem. Something like 'Title must be
> filled.' .
>
> I don't know how to do that.
>
> Please help me.
>
> Thank you very much,
>
> Gabriel.
>
> -------------------------------
>
> # app\models\sfile.rb
> class Sfile < ActiveRecord::Base
>          validates_presence_of :title
> end
>
> # app\controllers\sfiles_controller.rb
> class SfilesController < ApplicationController
>          def index
>                 �...@page_title = 'Free SWF Hosting'
>                 �...@sfile = Sfile.new
>          end
>
>          def create
>                 �...@sfile = Sfile.new(params[:sfile])
>                  respond_to do |format|
>                          if @sfile.save
>                                  flash[:notice] = 'File was successfully 
> created.'
>                                  format.html { redirect_to(:action => 
> 'index') }
>                          else
>                                  format.html { redirect_to(:action => 
> 'index') }
>                          end
>                  end
>          end
> end
>
> # app\views\sfiles\index.html.erb
> <p>Upload your file:</p>
>
> <% form_tag(:controller => "sfiles", :action => "create") do |f|%>
>
>   <p>
>     <%= label_tag :title, 'FIle Name: ' %><br />
>     <%= text_field_tag :title %>
>   </p>
>   <p>
>    <%= label_tag(:description, "File description (optional) :") %><br /
>
>    <%= text_area_tag(:description, nil, :size => "44x6") %><br />
>    <%= submit_tag("Update") %>
>   </p>
> <% end %>
>
> -------------------------------
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