ruby on rails - How to have user_id inserted in a different table (no, not foregin key) -

this table:

  load (0.4ms)  select "likes".* "likes"   +----+------------+-------------------------+-------------------------+---------+   | id | article_id | created_at              | updated_at              | user_id |   +----+------------+-------------------------+-------------------------+---------+   | 1  | 1          | 2014-03-24 19:07:59 utc | 2014-03-24 19:07:59 utc |         |   | 2  | 2          | 2014-03-24 19:18:59 utc | 2014-03-24 19:18:59 utc |         |   | 3  | 4          | 2014-03-24 19:19:14 utc | 2014-03-24 19:19:14 utc |         |   | 4  | 9          | 2014-03-24 19:47:36 utc | 2014-03-24 19:47:36 utc |         |   +----+------------+-------------------------+-------------------------+---------+   4 rows in set 

as can see, it's not filling in user_id information when article.

how fill in information in table above?

this method in articlecontroller:

  def like_vote     @article = article.find(params[:id])     @article.likes.create    redirect_to(article_path)   end 

i'm kind of confused on figuring out how insert user_id in aforementioned method so, table stores user_id.

help?

in case needed: view

       <td><%= pluralize(article.likes.count, "like") %></td>        <td><%= button_to '+1', "/articles/#{article.id}/user/#{current_user.id}/like_vote", method: :post %></td> 

you should set user_id, example:

@article.likes.create(user_id: current_user.id)