Rails - Mar 2006 - Validation not working.......

HI,
I am new to ruby. I am developing small application in ROR. Following is 
code for my rHtml , Controller & Model. PLease see it & let me know why 
data in form is not get validated & also how to check for whether data i 
have entered in form (username) is present in database or not? (Like 
Login form).
following is my code:-
---index.rhtml--------
<%= start_form_tag(:action => "login")%>
<%=text_field("user", "name", "size" =>
20)%>
<%=password_field("user", "password", "size"
=> 20)%>
<%= submit_tag %>
<%= end_form_tag %>
------------------------------------------
-----users_controller.rb-----------------
  def login
	  @user = User.new(params[:user])
	  redirect_to :action => ''list''
  end

 def new
    @user = User.new
  end
-----------------------------------------
------user.rb----------------------------
class User < ActiveRecord::Base
	validates_presence_of :name
end
-----------------------------------------

In Above Form I want when user enters "name" field blank ihn form it 
should give error message of validation.

Thanks in advance.
Prash

-- 
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On Fri, 2006-03-17 at 05:44 +0100, Prashant Tiwari
wrote:
> HI,
> I am new to ruby. I am developing small application in ROR. Following is 
> code for my rHtml , Controller & Model. PLease see it & let me know
why
> data in form is not get validated & also how to check for whether data
i
> have entered in form (username) is present in database or not? (Like 
> Login form).
> following is my code:-
> ---index.rhtml--------
> <%= start_form_tag(:action => "login")%>
> <%=text_field("user", "name", "size" =>
20)%>
> <%=password_field("user", "password",
"size" => 20)%>
> <%= submit_tag %>
> <%= end_form_tag %>
> ------------------------------------------
> -----users_controller.rb-----------------
>   def login
> 	  @user = User.new(params[:user])
> 	  redirect_to :action => ''list''
>   end
> 
>  def new
>     @user = User.new
>   end
> -----------------------------------------
> ------user.rb----------------------------
> class User < ActiveRecord::Base
> 	validates_presence_of :name
> end
> -----------------------------------------
> 
> In Above Form I want when user enters "name" field blank ihn form
it
> should give error message of validation.
> 
----
I don''t see any problem there...that looks good. If there''s a
problem
(and you didn''t say there is), the problem is likely how you handle
errors in your controller...

and of course, I don''t know what new.rhtml looks like.

Craig

The problem is that you haven''t asked if it is valid:

 def login 
          @user = User.new(params[:user])
          if @user.valid?
            redirect_to :action => ''list''
            return # cuz you can only redirect once per action
          else
            flash[:error] = ''something bad happened''
            render :action => ''index''
          end
  end

My (untested) code is dismal because neither code path displays a natural
template (which would be new.rhtml) relying on redirects or renders instead.
Consider using a before_filter to do your login as described nicely in
AWDWR.

If you''d like to see some straightforward Rails code, do a
''script/generate
scaffold MyTable'' and you''ll see how the paradigm works with
new/create and
edit/update.
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