[Rails] User Association

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

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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