Image Uploading to facebook and tagging friends

For uploading and tagging the friends on Facebook in Ruby on Rails , we need a gem named “fb-graph”. Which will provide the api call for this functionality.

# @Params : params
# @Return : None
# @Purpose : To tag user on the image with comment and upload it to facebook
def create

# find the image from the image_id
@image = Image.find_by_id(params[:image_id])

# fetch the user details from the facebook
me =

#create the array of friends uid

friends = params[:friends].split(",")

tags = []

# looping through friends array

friends.each do |friend|

#creating a new tag object and add it to tag array

tags <<
:id => friend,
:name => "with Facebook profile link",
: x => 2*Random.rand(9),
:y => 9*Random.rand(2)

end # end of friends block

# uploading the image the friends tag!(
:url => @image.picture.url ,
:message => params[:message],
:tags => tags

flash[:success] = "Successfully uploaded and tagged the your friends."

redirect_to image_path(@image)

end # end of create action

Also you can pass the source file to upload the image instead of image url using!(
:source =>, 'fb_graph.png'), 'rb'),
:message => params[:message],
:tags => tags

For more information visit the site

Also you can checkout my running application at
Thanks for reading the post……. ūüôā


Authorization with dropbox in Ruby on Rails using dropbox-sdk

For Dropbox authorization we have a nice ruby gem “dropbox-sdk”. Which will provide a nice interface through which we can call the dropbox api in ruby on rails.

we have to create a dropbox application at

You have to fill up a form to create an application , below is a sample data for the form

App Type : Core API
App Name: ImageUploader
Description:  Sample  application for image uploading.
Access:  Full Dropbox

After submitting the form you will get  App Key and App secret.

Add gem “dropbox-sdk” in Gemfile and bundle it.

Then create a file dropbox_config.rb in side the “application_name/config/initializer/”.

Add the below data ¬†to dropbox_config.rb file and change the “XXXXXXX” with your app data .

# Get your app key and secret from the Dropbox developer website
DROPBOX_APP_MODE = "dropbox" # if you have a single-directory app or "dropbox" if it has access to the whole dropbox

Now create the controller , here the name of the controller is “users” and the code for it is given below:-

class UsersController < ApplicationController

# @Params : None
# @Return : None
# @Purpose : To create new dropbox session for authorization
def authorize

#serialize and save this DropboxSession
session[:dropbox_session] = dbsession.serialize
#pass to get_authorize_url a callback url that will return the user here
redirect_to dbsession.get_authorize_url url_for(:action => 'dropbox_callback')


# @Params : None
# @Return : None
# @Purpose : To callback for dropbox authorization
def dropbox_callback

dbsession = DropboxSession.deserialize(session[:dropbox_session])
dbsession.get_access_token #we've been authorized, so now request an access_token
session[:dropbox_session] = dbsession.serialize
current_user.update_attributes(:dropbox_session => session[:dropbox_session])
session.delete :dropbox_session
flash[:success] = "You have successfully authorized with dropbox."

redirect_to root_path

end # end of dropbox_callback action

end # end of class

Now we are ready to do any thing that is possible with dropbox(eg:- upload ,  download ).

Lets try to upload a file to dropbox the code for it is below
dbsession = DropboxSession.deserialize(current_user.dropbox_session)
# create the dropbox client object
data ="/path/to/test.png")

thanks for reading .

You can checkout my sample application at