Uploading Images using paperclip in rails 3 - ruby-on-rails-3

Question

I am trying to upload an image in my Rails Application. However, I am unable to do so. I am relatively new to rails and I need some help here.
I have a "Picture" Model shown here -
class Picture < ActiveRecord::Base
attr_accessible :photo, :tag
has_attached_file :photo, :styles => { :medium => "300x300>",
:large => "1000x1000>", :thumb => "100x100>" }
end
I have a "Pictures" Controller shown here -
class PicturesController < ApplicationController
def new
#picture = Picture.new
end
def create
#picture = Picture.create( params[:picture] )
if #picture.save
flash.now[:success] = "Image Uploaded"
redirect_to #picture
else
render 'new'
end
end
def index
end
def show
#picture = Picture.find(params[:id])
send_data #picture.photo, :type => 'image/png', :disposition => 'inline'
end
def imageshow
end
end
Lastly, These are my "new" and "show" views:
"new.html.erb"
<h1>Upload an Image</h1>
<div>
<%= form_for(#picture, :html => {:multipart => true}) do |f| %>
<%= f.file_field :photo %>
<%= f.label :tag %>
<%= f.text_field :tag %>
<%= f.submit "Submit", class: "btn btn-large btn-primary" %>
<% end %>
</div>
"show.html.erb"
<h1>Displaying Uploaded Image</h1>
<div>
<%= image_tag #picture.photo.url %>
<%= image_tag #picture.photo.url(:large) %>
</div>
I am able to reach the Upload page (ie, new.html.erb in Pictures Controller). However, when I upload an image I get the following error:
"This image "http://10.102.119.20:3000/pictures/12" cannot be displayed because it contains errors"
My queries are:
Where does an image get uploaded on the server?
Is there any configuration that needs to be done?
Is there any other issue with my code?
Thanks in advance for any help..!!

Answer 1

Ryan Bates discusses Paperclip in his Railscasts. Check it out. It helped me get started.