user.rb

require 'digest/md5'

# Moderators, but using a failed pwd mechanism
# TODO, migrate to full active_admin
class User < ApplicationRecord
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, authentication_keys: [:login]
  # :registerable, :validatable

  has_many :notes

  validates :login, presence: true

  def encrypted_password=(pass)
    self[:password] = pass
  end

  def encrypted_password
    self[:password]
  end

  def self.find_first_by_auth_conditions(warden_conditions)
    conditions = warden_conditions.dup
    login = conditions.delete(:login)
    if login.present?
      where(conditions).find_by login: login
    else
      find_first(conditions)
    end
  end

  def valid_password?(password)
    encrypted_password == password_digest(password)
  end

  def to_s
    "#{firstname} #{lastname}"
  end

  protected

  def password_digest(password)
    Digest::MD5.hexdigest password
  end
end