Association of User and Post

Please Im trying to create an application where i can post like twitter, but i was the users name to be posted under their respective posts

My Post_controller looks like this

def index
     @posts = Post.all(:order => "created_at DESC")
     @users = User.find(:all)
     #@user_id = current_user.find(params[:id])
 
     respond_to do |format|
       format.html
     end
  end
 
 
 
 def create
     @post = current_user.posts.create(:message => params[:message])
     @user.id = current_user.username
 end
 

the models both have the correct association and tables are having User_id as primary on User table and Foreign on the Post Table, how do i create a method to be a able to have my index view show the post and name.`

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