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 :)

--
Posted via http://www.ruby-forum.com/.

--
You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group.
To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscribe@googlegroups.com.
To post to this group, send email to rubyonrails-talk@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/7d1c4682a1e885d80a8023e854db5230%40ruby-forum.com.
For more options, visit https://groups.google.com/groups/opt_out.