```ruby
class ApplicationHelper::Button::CloudVolumeBackupCreate < ApplicationHelper::Button::ButtonNewDiscover
  def disabled?
    ManageIQ::Providers::CloudManager.none? do |ems|
      Module.const_defined?("#{ems.class}::CloudVolume") &&
        ems.class::CloudVolume.supports?(:backup_create)
    end
  end
end
```

Fix constantizing CloudVolume for disable? check
user
```ruby
class ApplicationHelper::Button::CloudVolumeBackupCreate < ApplicationHelper::Button::ButtonNewDiscover
  def disabled?
    ManageIQ::Providers::CloudManager.none? do |ems|
      "#{ems.class}::CloudVolume".safe_constantize&.supports?(:backup_create)
    end
  end
end
```
assistant