```ruby
class Author < ActiveRecord::Base
  authenticates_with_sorcery!

  validates_confirmation_of :password, message: "Passwords should match", if: :password
end
```

Add email, username, and password validations to User
user
```ruby
class Author < ActiveRecord::Base
  authenticates_with_sorcery!

  validates_confirmation_of :password, presence: true, message: "Passwords should match", if: :password
  validates :username, presence: true, uniqueness: true
  validates :email, presence: true, uniqueness: true
  validates :password, presence: true, length: {minimum: 6}
end
```
assistant