How to work with koala gem for facebook integration with Ruby On Rails:- I am just giving a simple example with koala gem :-)

How to work with koala gem for facebook integration with Ruby On Rails:-
I am just giving a simple example with koala gem :-)

1. Create a ROR project
2. Install Koala gem and make necessorry changes into your enviroment.rb file.
=> config.gem "koala"

=> after the "end" tag of your environment file add the folowing line

require 'rubygems'
require 'koala'

# for Facebook Connect
FB_APP_KEY = "your app key"
FB_APP_SECRET = "your app secret key"
FB_APP_ID = "your app id"

3. In your HTML file or layout file add the following line

< xmlns="http://www.w3.org/1999/xhtml" fb="http://www.facebook.com/2008/fbml">
and in your (controller)=>user/(action)login -> View file i.e login.html.erb add the following

< id="fb-root">< /div>

< src="http://connect.facebook.net/en_US/all.js">

<>

FB.init({

appId : '131557463566628',

status : true, // check login status

cookie : true, // enable cookies to allow the server to access the session

xfbml : true // parse XFBML

});

FB.Event.subscribe('auth.sessionChange', function(response) {

if (response.session) {

location.href = '/user/account';

// A user has logged in, and a new cookie has been saved

} else {

location.href = '/user/login';

// The user has logged out, and the cookie has been cleared

}

});

< /script>

4. For Facebook login button add the following
< perms="email,user_birthday">< /fb:login-button>

5. Now after the user get login through Flogin. the user will be redirect to account(action) of user(controller). SO add the following line of code to see some action ..

def account
@oauth = Koala::Facebook::OAuth.new(FB_APP_ID, FB_APP_SECRET, 'http://192.168.1.50:3000/')

user_id = @oauth.get_user_from_cookies(cookies) # gets the user's ID

user_info = @oauth.get_user_info_from_cookies(cookies) # parses and returns the entire hash

access_token = user_info["access_token"]


# generate authenticating URL
auth_url = @oauth.url_for_oauth_code

# hit the authenticating URL url generated by @oauth.url_for_oauth_code it will redirect to ur call back page with 'code' parameter. copy & paste the code to code variable
code = "b5b61e003e4d0565285e68aa-1160256180|v2DFQ5gUWKxucmYuqiN1h847N4s"

# fetch the access token once you have the code
oauth_access_token = @oauth.get_access_token(code)

# initialize a Graph API connection, for instance
@graph = Koala::Facebook::GraphAPI.new(oauth_access_token)

#Fetch user profile data
profile = @graph.get_object("me")

#Fetch user's friend list
friends = @graph.get_connections("me", "friends")

#Write into user's wall or friend feed
@graph.put_object("me", "feed", :message => "I am writing on my wall!")

end
6. Thats all :-)