ruby on rails - Add user id to comment model -

i'm following tutorial :

http://guides.rubyonrails.org/getting_started.html#adding-a-second-model

it works when using commenter , comment user can add name , message want associate comment user id (i have users)

it uses rails generate model comment commenter:string body:text post:references want replace commenter:string user id association (user_id:integer?). in previous question suggested author_id:integer did not work. not sure start , there doesn't seem tutorials on subject (i have read ror guides on associations etc can't find correct way generate user id comment model)

comments_controller.rb

def create @listing = listing.find(params[:listing_id]) @comment = @listing.comments.create(params[:comment]) redirect_to listing_path(@listing) end 

you can generate comment mode this:

rails generate model comment user:references body:text post:references

the references type specify create user_id:integer column , adds belongs_to association comment model:

class comment < activerecord::base   belongs_to :user   belongs_to :post end 

if want have comment#commenter association refer user rather comment#user, can define in comment model follows:

class comment < activerecord::base   belongs_to :commenter, class_name: 'user', foreign_key: 'user_id'   belongs_to :post end