Problem while creating a new record

Hi experts
I tried to save data in my Database in RoR but i could not do that.No
Error occured but i had no success to save data.hier is my codes:
in my Controller:

class VorlesungsController < ApplicationController
  def new
         @vr=Vorlesung.new
  end

  def create
    @vorlesung=Vorlesung.create(params[:vr])
    if @vorlesung.save
      flash[:notice]='ABC'
      render :action => 'index'
    else
      flash[:notice]='DEF '
      render :action => 'index'
    end
  end
end

My View:

<%= form_for :vorlesung do |v| %>
    Name : <%= v.text_field :Name %> <br>
    Name de Professur : <%= v.text_field :Leiter_name %><br>
    <%= v.submit 'Speicher'%>

<% end %>

i think that my Form_for is not in correct form because when i delete
create function from the controller everythings is as before and when i
changed :vorlesung in Form_for to @vr an error occured :
                              NoMethodError in Vorlesungs#new
Thank you for your help

Change that to:
@vorlesung=Vorlesung.new

And see what effect that has.

Thank you Michael ,

I did it but everythings remains as before
when i changed Form_for into
  <%= form_for @vorlesung do |v| %>
an error like this occured:
   NoMethodError in Vorlesungs#new
when Form_for remains as:
  <%= form_for :vorlesung do |v| %>
after clicking my submit button only the content of textboxes deleted
and no other effect

Babak bsn wrote in post #1017477:

Thank you Michael ,

I did it but everythings remains as before
when i changed Form_for into
  <%= form_for @vorlesung do |v| %>
an error like this occured:
   NoMethodError in Vorlesungs#new
when Form_for remains as:
  <%= form_for :vorlesung do |v| %>
after clicking my submit button only the content of textboxes deleted
and no other effect

Post more of the error message, and any code in the error message.

NoMethodError in Vorlesungs#new

Showing /home/babak/Management/app/views/vorlesungs/new.erb where line
#1 raised:

undefined method `vorlesungs_path' for #<#<Class:0xb6009cfc>:0xb6008f3c>
Extracted source (around line #1):

1: <%= form_for @vorlesung do |v| %>
2: Name : <%= v.text_field :Name %> <br>
3: Name de Professur : <%= v.text_field :Leiter_name %><br>
4: <%= v.submit 'Speicher'%>
Rails.root: /home/babak/Management

this error occured when my new.html.erb is:
<%= form_for @vorlesung do |v| %>
    Name : <%= v.text_field :Name %> <br>
    Name de Professur : <%= v.text_field :Leiter_name %><br>
    <%= v.submit 'Speicher'%>

<% end %>

and my controller is:

class VorlesungsController < ApplicationController
  def new
         @vorlesung=Vorlesung.new
  end

def create
    @vorlesung=Vorlesung.create(params[:vorlesung])
    if @vorlesung.save
       @status_message = 'Student inserted successfully.'
    else
      render 'new'
    end
  end
end

i think that my Form_for is not in correct form because when i
delete create function from the controller everythings is as
before and when i changed :vorlesung in Form_for to @vr
an error occured :

This looks wrong:

  def create
     @vorlesung=Vorlesung.create(params[:vr])

What the hell is :vr?

What version of rails are you using? In rails 3, you would write:

<%= form_for(@vorlesung) do |v| %>

    Name : <%= v.text_field :name, "Name:" %> <br>

    Name de Professur : <%= v.text_field :leiter_name, "Leiter name:"
%><br>

    <%= v.submit 'Speicher'%>

<% end %>

Babak bsn wrote in post #1017480:

NoMethodError in Vorlesungs#new

Showing /home/babak/Management/app/views/vorlesungs/new.erb where line
#1 raised:

undefined method `vorlesungs_path' for #<#<Class:0xb6009cfc>:0xb6008f3c>
Extracted source (around line #1):

I think that means you did not define the proper route in your
config/routes.rb file. If you do this in your routes.rb file:

SampleApp::Application.routes.draw do

  resources :vorlesung

then rails defines a lot of what are called 'named routes' for you.
Read this:

http://guides.rubyonrails.org/routing.html

Thank you friends,that has been solved