carrierwave_backgrounderで画像が投稿されない

model/tip.rb

class Tip < ApplicationRecord
  belongs_to :user
  has_many :comments
  mount_uploader :image, ImageUploader # carrierwave
  store_in_background :image
  has_many :tip_tag_relations, foreign_key: :tip_id, dependent: :destroy
  has_many :tags, through: :tip_tag_relations
  has_many :likes
  has_many :liked_users, through: :likes, source: :user
  <省略>
  end
end

model/tip_tag.rb

class TipTag
  include ActiveModel::Model
  attr_accessor :title, :category_id, :description, :user_id, :image, :name, :id, :_method, :authenticity_token, :commit, :tip

  validates :category_id, numericality: { other_than: 1 }
  with_options presence: true do
    validates :title, :description, presence: true
  end

  delegate :persisted?, to: :tip

  def initialize(attributes = nil, tip: Tip.new)
    @tip = tip
    attributes ||= default_attributes
    super(attributes)
  end

  def save(tag_list)
    ActiveRecord::Base.transaction do
      @tip.update(title: title, category_id: category_id, description: description, image: image, user_id: user_id)
      @tip.tip_tag_relations.each do |tag|
        tag.delete
      end

      tag_list.each do |tag_name|
        tag = Tag.where(name: tag_name).first_or_initialize
        tag.save
        tip_tag = TipTagRelation.where(tip_id: @tip.id, tag_id: tag.id).first_or_initialize
        tip_tag.update(tip_id: @tip.id, tag_id: tag.id)
      end
    end
  end

  def to_model
    tip
  end

  private

  def default_attributes
    {
      title: tip.title,
      category_id: tip.category_id,
      description: tip.description,
      image: tip.image,
      name: tip.tags.pluck(:name).join(','),
    }
  end
end

uploaders/image_uploader.rb

class ImageUploader < CarrierWave::Uploader::Base
  # Include RMagick or MiniMagick support:
  include CarrierWave::RMagick
  include CarrierWave::MiniMagick

  # Choose what kind of storage to use for this uploader:
  if Rails.env.development?
    storage :file
    include ::CarrierWave::Backgrounder::Delay
  elsif Rails.env.test?
    storage :file
  else
    storage :fog
    include ::CarrierWave::Backgrounder::Delay
  end

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    # "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
    if Rails.env.test?
      "uploads_#{Rails.env}/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
    else
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
    end
  end

  # Create different versions of your uploaded files:
  version :thumb do
    process convert: ['png', 0]
    process resize_to_limit: [1000, 1000]
  end
end

workers/test_worker.rb

class TestWorker
  include Sidekiq::Worker
  sidekiq_options queue: :test
  def perform(tip_params, tag_list)
    tip = TipTag.new(tip_params)
    tip.save(tag_list)
  end
end

CarrierWave::Backgrounder.configure do |c|
  # c.backend :delayed_job, queue: :carrierwave
  # c.backend :active_job, queue: :carrierwave
  # c.backend :resque, queue: :carrierwave
  c.backend :sidekiq, queue: :carrierwave
  # c.backend :girl_friday, queue: :carrierwave
  # c.backend :sucker_punch, queue: :carrierwave
  # c.backend :qu, queue: :carrierwave
  # c.backend :qc
end

config/initializers/sidekiq.rb

Sidekiq.configure_server do |config|
  config.redis = { url: 'redis://localhost:6379', namespace: 'test_sidekiq' }
end

Sidekiq.configure_client do |config|
  config.redis = { url: 'redis://localhost:6379', namespace: 'test_sidekiq' }
end

:verbose: false
:pidfile: ./tmp/pids/sidekiq.pid
:logfile: ./log/sidekiq.log
:concurrency: 10
:queues:
  - [carrierwave, 1]
  - default
  - test

$ bundle exec sidekiq -q test -C config/sidekiq.yml
<省略> 
2021-07-22T10:02:11.334Z pid=62815 tid=ov4fn7ua3 class=TestWorker jid=fa5acb575e34b7981317d8c8 INFO: start
2021-07-22T10:02:11.468Z pid=62815 tid=ov4fn7ua3 class=TestWorker jid=fa5acb575e34b7981317d8c8 elapsed=0.134 INFO: done

$ bundle exec sidekiq -q carrierwave -C config/sidekiq.yml
<省略> 
2021-07-22T10:02:11.468Z pid=62893 tid=oupmco9wd class=CarrierWave::Workers::StoreAsset jid=28bc5caf5e0090ceee4286d3 INFO: start
2021-07-22T10:02:11.471Z pid=62893 tid=oupmco9wd class=CarrierWave::Workers::StoreAsset jid=28bc5caf5e0090ceee4286d3 elapsed=0.004 INFO: done

$ redis server
<省略> 
63359:C 22 Jul 2021 19:07:10.110 * DB saved on disk
58356:M 22 Jul 2021 19:07:10.203 * Background saving terminated with success