Adding a “Like/Unlike” button to a post in Rails

Question

The site is a simple community where each user creates posts and users may \"like\" them or \"unlike\" them.

I have a Post and a Like model. Currently, I\'m listing all

Answer 1

Also you could add validation to your Like model like so:

validate :user_does_not_already_like_post

def user_does_not_already_like_post
  errors.add(:user, "You can only like a post once.") if user.already_likes?(post)
end