How can you make the "like" action only run once per user in Rails?

Question

Ruby on Rails

Started learning Rails. Now I'm making a news site and there was one question about voting for an article. How can I make the "like" action only run once per user.

def like
   @article = Article.find(params[:id])   
   @article.increment!(:votes_count)
   redirect_to action: :show
end

Answer 1

Keep information about which user voted for what. Then check in this action.