Rails: How to set up Active Record Associations? - ruby-on-rails

Question

I am relatively new to rails and doing the simplest thing: Associate users and posts. I read this, but what more than this do I need to do to make it work (or is this the only thing)?:
class User < ActiveRecord::Base
has_many :posts, :dependent => :destroy
end
class Post < ActiveRecord::Base
belongs_to :user
end
Update:
I can't make it work. When I make a post with a signed in user, I get false when I do #user.posts.any? in the console. My code:
post.rb
class Post < ActiveRecord::Base
attr_accessible :title, :user_id
belongs_to :user
before_create :default_values
user.rb (I use devise)
class User < ActiveRecord::Base
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
attr_accessible :email, :password, :password_confirmation, :remember_me
has_many :posts, dependent: :destroy
end
20130320162700_create_posts.rb
class CreatePosts < ActiveRecord::Migration
def change
create_table :posts do |t|
t.string :title
t.integer :user_id
t.timestamps
end
end
end

Answer 1

You should make sure to include User's id in the migration that creates the posts table.
In your migration file (in the db/migrate folder you will find a file named like 20130325105934_create_posts.rb)
Inside the file you will find the migration code. Along the other declared attributes add
class CreatePosts < ActiveRecord::Migration
def change
create_table :posts do |t|
......
t.integer :user_id
......
end
end
It should be enough to make things roll :-)
Inside your code then you can create a new user as
#user = User.new(:login => "my_user", .....)
and then add posts with one of these two ways (there are others two).
post = Post.new(:title => "something", :text => "more of something", :user_id = #user.id)
or
post = Post.new(:title => "something", :text => "more of something")
#user.posts << post