how to include api in ruby on rails?

1)create an api using rails new appname
2)then create twitter app https://dev.twitter.com/apps[^]
3)add Inside your gemfile add the Twitter gem:
gem 'twitter'
4)rails g model tweet tweet_content:string
5) rails g controller tweet

in controller
 require "rubygems"
require "twitter"

class TweetController < ApplicationController
 def user_page
 @tweet = Tweet.new
 end

 def user_tweet
 @tweet = Tweet.new(params[:tweet])

 if @tweet.save then
 # Certain methods require authentication. To get your Twitter OAuth credentials,
 # register an app at http://dev.twitter.com/apps
 Twitter.configure do |config|
 config.consumer_key = 'key'
 config.consumer_secret = 'skey'
 config.oauth_token = 'token'
 config.oauth_token_secret = 'stoken'

 end

 # Initialize your Twitter client
 client = Twitter::Client.new

 # Post a status update
 client.update(@tweet.tweet_content)
 end
 render action: 'user_page', :notice => 'Twitter successfully posted'

 end

end
in model
class Tweet < ActiveRecord::Base
 # attr_accessible :title, :body
 attr_accessible :tweet_content
end
in user_page.html.erb
<%= form_for(@tweet, :url => '/user_tweet') do |tweet_form| %>
 <%= tweet_form.text_area :tweet_content %>
 <%= tweet_form.submit "Tweet" %>
<% end %>