form_user is invalid and is not listed in SwitchUser#available_users

[chrisyeung1121]

I have FormUser Model which belongs to User model, and in my FormUser model is to tak care of omniauth schemes login with email password logins. When I try to use the switch back feature, the following error apepars.

SwitchUser::InvalidScope in SwitchUserController#remember_user
form_user is invalid and is not listed in SwitchUser#available_users

My form user model is as below.

class FormUser < User
    attr_accessor :current_password

    validates_presence_of :email, if: :email_required?
    validates_uniqueness_of :email, allow_blank: true, if: :email_changed?
    validates_format_of :email, with: Devise.email_regexp, allow_blank: true, if: :email_changed?

    validates_presence_of :password, if: :password_required?
    validates_confirmation_of :password, if: :password_required?
    validates_length_of :password, within: Devise.password_length, allow_blank: true

    def password_required?
        return false if email.blank?
        !persisted? || !password.nil? || !password_confirmation.nil?
    end

    def email_required?
        true
    end
end

[chrisyeung1121]

Overcome the error by doing the following changes in config switch_user.rb, however, the user doesn't switch at all when the select box is selected.

  config.available_users = { :form_user => lambda { FormUser.all } }

  # available_users_identifiers is a hash,
  # keys in this hash should match a key in the available_users hash
  # value is the name of the identifying column to find by,
  # defaults to id
  # this hash is to allow you to specify a different column to
  # expose for instance a username on a User model instead of id
  config.available_users_identifiers = { :form_user => :id }

  # available_users_names is a hash,
  # keys in this hash should match a key in the available_users hash
  # value is the column name which will be displayed in select box
  config.available_users_names = { :form_user => :email }

  # controller_guard is a block,
  # if it returns true, the request will continue,
  # else the request will be refused and returns "Permission Denied"
  # if you switch from "admin" to user, the current_user param is "admin"
  config.controller_guard = lambda { |current_user, request, original_user| current_user && current_user.has_role?('admin') || original_user && original_user.has_role?('admin') || original_user && original_user.has_role?('super_admin') }

  # view_guard is a block,
  # if it returns true, the switch user select box will be shown,
  # else the select box will not be shown
  # if you switch from admin to "user", the current_user param is "user"
  config.view_guard = lambda { |current_user, request, original_user| current_user && current_user.has_role?('admin') || original_user && original_user.has_role?('admin') || original_user && original_user.has_role?('super_admin') }

  # redirect_path is a block, it returns which page will be redirected
  # after switching a user.
  config.redirect_path = lambda { |request, params| '/dashboard' }

[chrisyeung1121]

Very confused with the gem. can anyone help?