thingspeak/app/models/admin_user.rb

# == Schema Information
#
# Table name: admin_users
#
#  id                     :integer          not null, primary key
#  email                  :string(255)      default(""), not null
#  encrypted_password     :string(255)      default(""), not null
#  reset_password_token   :string(255)
#  reset_password_sent_at :datetime
#  remember_created_at    :datetime
#  sign_in_count          :integer          default(0), not null
#  current_sign_in_at     :datetime
#  last_sign_in_at        :datetime
#  current_sign_in_ip     :string(255)
#  last_sign_in_ip        :string(255)
#  created_at             :datetime
#  updated_at             :datetime
#

class AdminUser < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable,
         :recoverable, :rememberable, :trackable, :validatable

  attr_accessor :login

  protected

    def self.find_for_database_authentication(warden_conditions)
      conditions = warden_conditions.dup
      login = conditions.delete(:login)
      where(conditions).where(["lower(email) = :value", { :value => login.strip.downcase }]).first
    end

end