undefined method with has_many association - ruby-on-rails

Question

I have 2 models with a one-to-many association: User and Recipe. the User class has_many :recipes while the Recipe class belongs_to :user. I've already run the migration, reloaded the rails console, and checked to make sure that user_id is a column in the recipes table. Still, I get an undefined method error when I try to append a recipe to a user:
2.0.0-p598 :047 > user.recipes << Recipe.first
NoMethodError: undefined method `recipes' for #<User:0x00000004326fa0>
here is the migration code (I've already run rake db:migrate):
class AddUserIdToRecipes < ActiveRecord::Migration
def change
add_column :recipes, :user_id, :integer
end
end
Here is the User model code:
class User < ActiveRecord::Base
has_one :profile
has_many :recipes
end
Here is the Recipe model code:
class Recipe < ActiveRecord::Base
validates_presence_of :title, :body
belongs_to :user
def long_title
"#{title} - #{published_at}"
end
end
Why does recipes still show up as an undefined method?

Answer 1

Try this on your console:
irb(main):007:0> user = User.new first_name: 'John', last_name: 'Doe'
=> #<User id: nil, first_name: "John", last_name: "Doe", created_at: nil, updated_at: nil>
irb(main):008:0> user.save
(0.1ms) begin transaction
SQL (0.6ms) INSERT INTO "users" ("created_at", "first_name", "last_name", "updated_at") VALUES (?, ?, ?, ?) [["created_at", "2015-01-19 21:14:33.489371"], ["first_name", "John"], ["last_name", "Doe"], ["updated_at", "2015-01-19 21:14:33.489371"]]
(0.6ms) commit transaction
=> true
irb(main):009:0> r = Recipe.new name: 'oooohh awesome', description: 'my description goes here'
=> #<Recipe id: nil, name: "oooohh awesome", description: "my description goes here", created_at: nil, updated_at: nil, user_id: nil>
irb(main):010:0> r.save
(0.1ms) begin transaction
SQL (0.2ms) INSERT INTO "recipes" ("created_at", "description", "name", "updated_at") VALUES (?, ?, ?, ?) [["created_at", "2015-01-19 21:15:16.548090"], ["description", "my description goes here"], ["name", "oooohh awesome"], ["updated_at", "2015-01-19 21:15:16.548090"]]
(1.2ms) commit transaction
=> true
irb(main):011:0> user.recipes << Recipe.first
Recipe Load (0.2ms) SELECT "recipes".* FROM "recipes" ORDER BY "recipes"."id" ASC LIMIT 1
(0.0ms) begin transaction
SQL (0.2ms) UPDATE "recipes" SET "updated_at" = ?, "user_id" = ? WHERE "recipes"."id" = 1 [["updated_at", "2015-01-19 21:15:49.181586"], ["user_id", 1]]
(1.3ms) commit transaction
Recipe Load (0.2ms) SELECT "recipes".* FROM "recipes" WHERE "recipes"."user_id" = ? [["user_id", 1]]
=> #<ActiveRecord::Associations::CollectionProxy [#<Recipe id: 1, name: "oooohh awesome", description: "sper long deskdk", created_at: "2015-01-19 21:10:24", updated_at: "2015-01-19 21:15:49", user_id: 1>]>
irb(main):012:0> user.save
(0.1ms) begin transaction
(0.0ms) commit transaction
=> true
irb(main):013:0> user.recipes
=> #<ActiveRecord::Associations::CollectionProxy [#<Recipe id: 1, name: "oooohh awesome", description: "sper long deskdk", created_at: "2015-01-19 21:10:24", updated_at: "2015-01-19 21:15:49", user_id: 1>]>
irb(main):014:0> user.recipes.first
=> #<Recipe id: 1, name: "oooohh awesome", description: "sper long deskdk", created_at: "2015-01-19 21:10:24", updated_at: "2015-01-19 21:15:49", user_id: 1>
irb(main):015:0>
you can see that Recipe.first has been inserted into user.recipes and its saved.
I made two models similar to yours, and have exactly the same setup as you. You can follow code above to write your controllers.