Hi Team,

       I have create one ruby on rails application ,i have one issue for
that image upload ,the image will override the some user , so any can solve
the issues
************************
contoller
class PhotosController < ApplicationController
  # GET /photos
  # GET /photos.xml
  def index
    @photos = Photo.all

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @photos }
    end
  end

  # GET /photos/1
  # GET /photos/1.xml
  def show
    @photo = Photo.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @photo }
    end
  end

  # GET /photos/new
  # GET /photos/new.xml
  def new
    @photo = Photo.new

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @photo }
    end
  end

  # GET /photos/1/edit
  def edit
    @photo = Photo.find(params[:id])
  end

  # POST /photos
  # POST /photos.xml
  def create
    @photo = Photo.new(params[:photo])

    respond_to do |format|
      if @photo.save
        format.html { redirect_to(@photo, :notice => 'Photo was successfully
created.') }
        format.xml  { render :xml => @photo, :status => :created, :location
=> @photo }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @photo.errors, :status =>
:unprocessable_entity }
      end
    end
  end

  # PUT /photos/1
  # PUT /photos/1.xml
  def update

    @photo = Photo.find(params[:id])

    respond_to do |format|
      if @photo.update_attributes(params[:photo])
        format.html { redirect_to(@photo, :notice => 'Photo was successfully
updated.') }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @photo.errors, :status =>
:unprocessable_entity }
      end
    end
  end

  # DELETE /photos/1
  # DELETE /photos/1.xml
  def destroy
    @photo = Photo.find(params[:id])
    @photo.destroy

    respond_to do |format|
      format.html { redirect_to(photos_url) }
      format.xml  { head :ok }
    end
  end
end

********************************
class Photo < ActiveRecord::Base
# Root directory of the photo public/photos
   PHOTO_STORE = File.join RAILS_ROOT, 'public', 'images'
   # Invoke save_photo method when save is completed
   after_save :save_photo


   def load_photo_file=(data)
     # Record the filename
     self.filename = data.original_filename
     # Store the data for later use

     @photo_data = data
   end



       name = File.join PHOTO_STORE, self.filename
       File.open(name, 'wb') do |f|
         f.write(@photo_data.read)
       end
       @photo_data = nil

     end
   end
   end
   def fileexist

 if FileTest.exists?(RAILS_ROOT + "public/images/#{@photo_data}")

      render :text => "yes"
else
      render :text => "no "
end
  end
************************

<table>
  <tr>
    <th>Filename</th>
  </tr>

<% @photos.each do |photo| %>
  <tr>
    <td><%=h photo.filename %></td>
    <td><%= image_tag photo.filename%></td>


    <td><%= link_to 'Show', photo %></td>
    <td><%= link_to 'Edit', edit_photo_path(photo) %></td>
    <td><%= link_to 'Destroy', photo, :confirm => 'Are you sure?', :method
=> :delete %></td>
  </tr>
<% end %>
</table>

<br />

<%= link_to 'New ', new_photo_path %>

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