Posted by

Tha.Suresh

Posted on

May 18, 2011

Posted under

rails, Ruby

Comments

2 Comments

Multiple File uploading in Rails3 Application using “Papercilp”

Hi friends,

Lets see how to upload multiple files in a rails 3 application.

First create a new rails project and go inside of the project directory.

$ rails new fileuploading
$ cd fileuploading

Add the Gms in following “Gemfile”

gem ‘nifty-generators’
gem ‘paperclip’


source 'http://rubygems.org'

gem 'rails', '3.0.3'
gem 'nifty-generators'
gem 'paperclip'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'.....

And bundle install it.

Now we have to create a scaffold. Do a following commands.

 $ rails g nifty:scaffold Post title:string
 $ rails g nifty:layout

It asks a Permission to Overwrite the layout file. just press “y”. It shoes like,
Overwrite /home/suresh/deal_projects/paperclip-test/app/views/layouts/application.html.erb? (enter “h” for help) [Ynaqdh]

Again migrate with db.

 $ rake db:migrate
 $ rm public/index.html

Then, Add the following line in your /config/routes.rb , root :to => “posts#index”
Then, create a model called “Asset”

$ rails g model Asset asset_file_name:string asset_content_type:string asset_file_size:integer asset_upload_at:datetime post_id:integer
$ rake db:migrate

Now in model folder, there is a file called “asset.rb”. Add the following lines into this file.

class Asset < ActiveRecord::Base
belongs_to  :post
has_attached_file  :asset, :styles => {  :large => "640*480",  :medium => "300*300>",  :thumb => "100*100>" }

end

And add the following lines into “posts.rb” file

class Post < ActiveRecord::Base
attr_accessible :title, :content,  :assets_attributes
has_many  :assets
accepts_nested_attributes_for  :assets,  :allow_destroy  => true
end

Edit app/controller/posts_controller.rb (Note the new and edit part)


def new
@post = Post.new
5.times { @post.assets.build }

end

def edit
@post = Post.find(params[:id])
5.times { @post.assets.build }
end

Edit and add the following lines in your app/view/post/_form.html.erb

<%= form_for @post, :html => { :multipart => true } do |f| %>
<%= f.error_messages %>
<p>
<%= f.label :title %><br />
<%= f.text_field :title %>
</p>

<% f.fields_for :assets do |asset_fields| %>

<% if asset_fields.object.new_record? %>
<p>
<%= asset_fields.file_field :asset %>
</p>

<% end %>
<% end %>

<% f.fields_for :assets do |asset_fields| %>
<%unless asset_fields.object.new_record? %>

<p>

<%= link_to image_tag(asset_fields.object.asset.url(:thumb)), asset_fields.object.asset.url(:original) %>

<%= asset_fields.check_box :_destroy %>
</p>

<% end %>
<% end %>

<p><%= f.submit %></p>
<% end %>

That’s All .

In tour terminal run ” rails s” command and open the “http://localhost:3000” in your browser. 🙂

Selecting the files

Uploaded into project 🙂

GitHub Link: https://github.com/thasuresh/fileuploading

My hearty thanks to: http://www.emersonlackey.com/article/paperclip-with-rails-3

Linux 20-years celebration video in tamil

Hi friends,

At 1991, Linus Torvalds, released his Kernel as open source. After that, the Linux Revolution happened.

To celebrate the 20 years of Linux, The Linux Foundation, is doing various activities.
Explore it here. http://www.linuxfoundation.org/20th
It released an animation video.

My Brother T.Shrinivasan wanted to translate the video in tamil. So he asked his friend to transcribe the audio as English text. He then also asked me to convert the English text into Tamil text.

Here the original English version video:

http://www.youtube.com/watch?v=5ocq6_3-nEw

Here the tamil version of the above video:
http://www.youtube.com/watch?v=gZKI0u18iLQ

More info: http://goinggnu.wordpress.com/2011/05/14/celebrating-20-years-of-linux-a-tamil-video/

🙂 🙂 🙂

Posted by

Tha.Suresh

Posted on

May 10, 2011

Posted under

rails

Comments

30 Comments

Google maps in Rails3 Application — Sample Application

Hi friends,

(New update: For new version(0.9.1) check Jay’s comment below)

(Update: this tutorial works only on gem version 0.7.7 and won’t work on latest gem version 0.8.7)

Using a gmaps4rails gem to display a map in our application

create a rails application using,

$ rails new gmaps

$ cd gmaps

Add this Gem in your Gemfile

gem ‘gmaps4rails’, ‘0.7.7’

Now bundle it ($ bundle install )and migrate with db ( $ rake db:migrate)

Create a scaffold using,

$ rails g scaffold Location name:string address:string longitude:float latitude:float

remove the longitude and latitude fields in _form.html.erb

After that, add this in app/view/layout

<%= yield :head %> (in your header) <%= yield :scripts %> (in your footer)

/app/views/layouts/application.html.erb

<html>
<head>
  <title>Googlemap</title>
  <%= stylesheet_link_tag :all %>
  <%= javascript_include_tag :defaults %>
  <%= csrf_meta_tag %>
  <%= yield :head %>
</head>
<body>
<%= yield %>
<%= yield :scripts %>
</body>
</html>

In model /app/models/location.rb to add

class Location < ActiveRecord::Base
 acts_as_gmappable
      def gmaps4rails_address
          address
      end
       def gmaps4rails_infowindow
         "<h4>#{name}</h4>" << "<h4>#{address}</h4>"
     end
end

add the line in controller /app/controllers/locations_controller.rb

def index
    @locations = Location.all
    @json = Location.all.to_gmaps4rails
    ..........

In your view app/views/locations/index.html.erb to add a last line as

<%= gmaps4rails(@json) %>

then start the server(http://localhost:3000/locations) to put the name and address, longitude and latitude as set automatically, then will be show the markers as corresponding address and click the marker icon.it will shows infowindow as name and address

That’s it!! If you have any questions please feel free to contact me. I will be happy to help where I can. 🙂