Sidekiqで動的に生成したworkerを実行すると、NameError：uninitialize constant〜が発生。

###前提・実現したいこと
railsでsidekiqを用いた非同期処理を実装しようと思っています。
クラス・キューをユーザーごとに動的生成を行い、非同期処理をユーザーごとに任意で実行・停止できるようにしたいのですが、下記エラーでキューが実行されません。
（Foo::Baz_User*というクラス、:work-*というキューを生成していきたいです。）
今回のような場合、関数で生成するためスコープの兼ね合いなどで参照できないということでしょうか？
もし対処方法があるようでしたら教えていただきたいと思います。よろしくお願いします。

###発生している問題・エラーメッセージ
キューの登録までは実行できるのですが、いざsidekiqがキューを実行する際に、下記のエラーが発生します。

2017-09-12T03:38:47.079Z 60023 TID-ow8lyypd4 WARN: NameError: uninitialized constant Foo::Baz_User1
2017-09-12T03:38:47.080Z 60023 TID-ow8lyypd4 WARN: ~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activesupport-5.0.6/lib/active_support/inflector/methods.rb:270:in `const_get'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activesupport-5.0.6/lib/active_support/inflector/methods.rb:270:in `block in constantize'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activesupport-5.0.6/lib/active_support/inflector/methods.rb:266:in `each'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activesupport-5.0.6/lib/active_support/inflector/methods.rb:266:in `inject'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activesupport-5.0.6/lib/active_support/inflector/methods.rb:266:in `constantize'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/activesupport-5.0.6/lib/active_support/core_ext/string/inflections.rb:66:in `constantize'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/sidekiq-3.4.1/lib/sidekiq/processor.rb:46:in `process'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/celluloid-0.16.0/lib/celluloid/calls.rb:26:in `public_send'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/celluloid-0.16.0/lib/celluloid/calls.rb:26:in `dispatch'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/celluloid-0.16.0/lib/celluloid/calls.rb:122:in `dispatch'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/celluloid-0.16.0/lib/celluloid/cell.rb:60:in `block in invoke'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/celluloid-0.16.0/lib/celluloid/cell.rb:71:in `block in task'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/celluloid-0.16.0/lib/celluloid/actor.rb:357:in `block in task'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/celluloid-0.16.0/lib/celluloid/tasks.rb:57:in `block in initialize'
~/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/celluloid-0.16.0/lib/celluloid/tasks/task_fiber.rb:15:in `block in create'

###該当のソースコード
workerファイル

ruby
1module Foo
2    class Bar
3    include Sidekiq::Worker
4
5        def self.id_init(user_id)
6            klass_name = "#{self.name.split('::').last}_User#{user_id}"
7            unless Foo.const_defined?(klass_name)
8              Foo.const_set(klass_name.to_sym, self.clone)
9              klass = Foo.const_get(klass_name.to_sym)
10              queue = klass.instance_variable_get(:@queue).to_s + "-#{user_id}"
11              klass.instance_variable_set(:@queue, queue)
12            end
13            Foo.const_get(klass_name.to_sym)
14        end
15    end
16
17    class Baz < Bar
18        @queue = :work
19
20        def perform(user_id)
21          #ループ処理
22        end
23    end
24end

controllerからキューの登録

ruby
1def start
2user = current_user
3Sidekiq::Client.enqueue(Foo::Baz.id_init(user.id),user.id)
4end

最終的に呼び出されるconstanizeメソッド

ruby
1def constantize(camel_cased_word)
2      names = camel_cased_word.split('::'.freeze)
3
4      # Trigger a built-in NameError exception including the ill-formed constant in the message.
5      Object.const_get(camel_cased_word) if names.empty?
6
7      # Remove the first blank element in case of '::ClassName' notation.
8      names.shift if names.size > 1 && names.first.empty?
9
10      names.inject(Object) do |constant, name|
11        if constant == Object
12          constant.const_get(name)
13        else
14          candidate = constant.const_get(name)
15          next candidate if constant.const_defined?(name, false)
16          next candidate unless Object.const_defined?(name)
17
18          # Go down the ancestors to check if it is owned directly. The check
19          # stops when we reach Object or the end of ancestors tree.
20          constant = constant.ancestors.inject(constant) do |const, ancestor|
21            break const    if ancestor == Object
22            break ancestor if ancestor.const_defined?(name, false)
23            const
24          end
25
26          # owner is in Object, so raise
27          constant.const_get(name, false)
28        end
29      end
30    end