Ruby on Rails

hi!! I am a newbie in ROR.

I have two models

Post
has_many :Comment


Comment
belongs_to :Post


the error displays when I try to save a comment related to certain post.
I get the following error
-----------------------------------------------------------------
undefined method `comment' for nil:NilClass
-----------------------------------------------------------------
my comment controllers

def new
@comment = Comment.new
render :layout => false
end

def create
@post = Post.find_by_id(params[:id])
@post_comment = @post.comment.create(params[:comment])
if @post_comment.save
redirect_to post_index_path
flash[:success] = "comment created!!"
end

Could someone please explain why am I getting this error..

Thanks in advance :)

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