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Rails: Best Association Model for Users & # 8594; Messages & # 8594; forum comment model, for example on a website?

I create a forum site where each registered user can write many posts and
each post can have many comments.
Also, each user can comment on any posts created by any other user.

      has_many              has_many
user ------------> Posts -------------- > Comments  
  |                                          ^
  |                                          |   
  |               has_many                   |
  |-------------------------------------------          
      belongs_to
Post ------------> User
  ^                 ^ 
  |                 |
  |                 |
  belongs_to     belongs_to
  |                 |
  |                 |
Comments-------------

I cannot get user information about comments using "post.comment.user" or
commenter_email = comments.user.email
How to achieve this?
Insert my models for reference: -

class Comment < ActiveRecord::Base  
belongs_to :post  
belongs_to :user  
end  
class Post < ActiveRecord::Base  
  has_many :comments, :dependent => :destroy  
end  
class User < ActiveRecord::Base  
  devise :database_authenticatable, :registerable,  
     :recoverable, :rememberable, :trackable, :validatable  
  attr_accessible :email, :password, :password_confirmation, :remember_me   
  has_many :posts  
  has_many :comments  
end

Here is my diagram: -

create_table "comments", :force => true do |t|  
t.integer  "post_id"  
t.integer  "user_id"  
t.text     "comment_text"  
t.datetime "created_at"  
t.datetime "updated_at"  
end  

create_table "posts", :force => true do |t|  
t.integer  "user_id"  
t.integer  "sell_or_buy"  
t.string   "title"  
t.text     "body"  
t.datetime "created_at"  
t.datetime "updated_at"  
end  

create_table "users", :force => true do |t|  
t.string   "email",  
t.string   "encrypted_password",
t.datetime "created_at"  
t.datetime "updated_at"  
end

I am using Rails 3.0.1.
suggest your thoughts.

+5
1

, post.comments post.comment

comments - , comments.user .

, :

post.comments.find(params[:id]).user

, :

post.comments.all.collect(&:user)
+8

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