Url problem

Rails
1

I contain oracle as my database
having table “oratest11”,contails 2 fields as
(id_field(Number),data(varchar2(20)) a sequence as “oratest11_seq” which
is incrementing the value of id_field

My model is as follows:-

class Oratest11 < ActiveRecord::Base
set_table_name ‘oratest11’
set_primary_key ‘id_field’
end

My Controler is as follows:-

class Oratest11sController < ApplicationController
def index
@oratest11s=Oratest11.find(:all)
end

def show
@oratest11=Oratest11.find(params[:id])
end

Index view:-

<% for ora in @oratest11s %> 
    <td><%=h ora.data %>
  </td>

<% end %>

<%=h ora.id_field %> <%= link_to 'show',:action=>'show',:id=>ora %>

Show View:-

<%= @oratest11.data %> <%= @oratest11.id_field %>

When i click on the show hiperlink error comes:-

Template is missing
Missing template oratest11s/show.erb in view path app/views

But when i used
default:-
http://localhost:3000/oratest11s/show/1.0
Instade Used:-
http://localhost:3000/oratest11s/show/1
it works fine…

so what could i used and how to directly go, after clicking the “view”
hiperlink:-
http://localhost:3000/oratest11s/show/1

when, i change datatype of id_field as Number to Integer it works
fine…
but, i dont want to change the datatype of id_field sence it contains
lots of records.