Q:

How to pass Devise's current_user as user_id?

I'm practicing my Ruby on Rails by creating a simple application where users can sign up (using Devise) and post articles. 
After installing Devise, I go ahead and generate a scaffold for the articles
 rails g scaffold article title:string article:text user_id:integer

Then I create the Devise user controller
rails generate devise User

My article controller:
class Article < ActiveRecord::Base
    belongs_to :user
end

My user controller:
class User < ActiveRecord::Base
  has_many :articles

  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  attr_accessible :email, :password, :password_confirmation, :remember_me
end

Now my question is: how do you make it so that user_id in http://localhost:3000/articles/new/ is automatically current_user.id?
Also, in http://localhost:3000/articles/ the user should only be able to view the articles associated with their user_id, not anyone elses. What changes to the articles controller should I make to do this?
It's my first time posting here at Stack Overflow and your help would be appreciated.. Thanks a bunch!
EDIT found the solution to the first question, for future reference.
I put 
<%= f.hidden_field :user_id %> 

in _form.html.erb, and 
def create
    @article.user_id = current_user.id 
    ...
end

to my article controller. This is successfully passing the current_user.id as the article's user_id perfectly.

A:

In your ArticleController#new action add the following line:
@article = current_user.articles.build
As for your index action:
@articles = current_user.articles

A:

Now my question is: how do you make it so that user_id in http://localhost:3000/articles/new/ is automatically current_user.id?

You should add to articles_controller's "def new" this line
@ask.user_id = current_user.id
so then form_for @ask asks for the user_id property of @ask and displays it. But I do not recommend doing this in a real-world app, where you probably would handle this step in "def create" of `articles_controller

`Also, in http://localhost:3000/articles/ the user should only be able to view the articles associated with their user_id, not anyone elses. What changes to the articles controller should I make to do this?

inside articles_controller's def index, change to @articles = Article.where(user_id:current_user.id). Note that you should also add a before_filter :require_user to make sure that current_user is not nil.

