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def self.process(site, object = nil, &block)
    dont_unblock = false
    block_res = true

    site.lock!
    if site.assets_blocked?
      dont_unblock = true
      raise Asset::BlockedException
    end
    site.assets_blocked = true
    site.save!

    block_res = yield if block_given?

    return false unless block_res
    return object.save if object

    true
  ensure
    site.update_attribute(:assets_blocked, false) unless dont_unblock
  end

  # во всех местах, где с ассетами делалось хоть что-нибудь, копипастился такой кусок:

      result =
      begin
        @asset = @site.assets.new
        @asset.process do
          @asset.attached = params[:file]
          @asset.folder_path = params[:path]
        end
      rescue Asset::BlockedException
        render json: { errors: [I18n.t("layout.assets.errors.assets_blocked")] } and return
      end