delete action and create cation for rails version 2.3.2

just now i starting to study ruby on rails ruby version=1.8.7 rails version =2.3.2

help me

i create delete and create new user action but present some error the error is

    uninitialized constant User::Id
    Extracted source (around line #19):

 16:         <td><%= user.fname %></td>
 17:         <td><%= user.lname %></td>
 18:         <td><%= user.dob %></td>
 19:         <td><%= button_to "delete", :url => {:controller => :users,:action => 'destroy',:id =>user.id}, :method => :delete %></td>
 20:       </tr>
 21:     <% end %>
 22: </table>

my mysql database table is

id  fname  lname   dob
 1  kamal   vimal  2012.02.12
 2  rahu    sharmi 2012.05.26
 3  mithun  kavi   2012.03.07

class User < ActiveRecord::Base

set_primary_key :id
has_one :id

end

my controller is

class UsersController < ApplicationController

def index
@users=User.all
end

def destroy
    # User.primary_key='id'
    @users=User.find(:id)
    @users.destroy
    flash[:notice] = "You have successfully Delete Recode"
end

def new
    @users=User.new
end

 def create
    @users=User.new(params[:users])
    if @user.save
        redirect_to_users_path
        flash[:notice] = "Your record is created!"
    else
        render :action => "index"
    end
 end

end

my view is

    <% @users.each do |user| %>

 <%= button_to "delete", :url => {:controller => :users,:action => 'destroy',:id =>user.id}, :method => :delete %>
<% end %>

anyone help me?