[Rails] Re: Simple (I'm sure) Question about Joins

Alright so I changed my comment form snippet from:

<%= form_for(@comment, :html => { :class => "joinform" }) do |f| %>

To:

<%= form_for([@snippet, @snippet.comments.build]) do |f| %>

Which caused my comment form to finally work successfully, however the
following code now fails (this is my comment snippet)

<div class="comment_container">
<%= gravatar_for comment.user, :size => 30 %> <span
class="username"><%= link_to comment.user.username, comment.user %>
commented <%= time_ago_in_words comment.created_at %></span>
<div class="comment_content"><%= comment.content %></div>
</div>

What does work about this is the comment.user and comment.created_at
lines. Oddly enough, comment.content still shows the comment content.
And comment.user.username still yields the users username,
comment.user.email yields the commenters email, etc. However when
passing comment.user into anything now fails.

NoMethodError in Snippets#show

Showing
/Users/morri534/rails_projects/srclockr/app/views/comments/_comment.html.erb
where line #2 raised:

undefined method `email' for nil:NilClass

I feel like I'm so close to getting a working comment system, but I'm
missing one piece of the puzzle. I fixed the article comment box not
working, but now the comments wont display the user info associated with
them.

As usual, any help is greatly appreciated :)

Here is some more code if it helps any:

class SnippetsController < ApplicationController
before_filter :signed_in_user, :only => [:create]
...
...
def show
@snippet = Snippet.find(params[:id])
@user = User.find(@snippet.user_id)
@comments = @snippet.comments
impressionist(@snippet)
end


class Comment < ActiveRecord::Base
attr_accessible :content, :snippet_id, :user_id
belongs_to :snippet
belongs_to :user


class Snippet < ActiveRecord::Base
attr_accessible :content, :title, :description

belongs_to :user
has_many :comments

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