SignIn service object

signin.rb

class SignIn < PlainModel
  attr_accessor :email
  attr_accessor :password

  validate :validate_user_exists
  validate :validate_password_correct

  def user
    User.find_by_email(email) if email.present?
  end

  private
  def validate_user_exists
    if user.blank?
     errors.add(:user_id, 'User not found')
    end
  end
  
  def validate_password_correct
    if user && !user.has_password?(password)
      errors.add(:password, 'Incorrect password') 
    end
  end 
end