Fix: NoMethodError (MAYBE-RAILS-CV)

[revise-dev]

The error occurs because we're trying to call delete_all on ActiveStorage::Variant, which is a processing utility class, rather than ActiveStorage::VariantRecord, which is the ActiveRecord model that actually corresponds to the database table active_storage_variant_records.

From examining the schema.rb file, we can see that Active Storage is properly set up with the active_storage_variant_records table (line 142-146). The original code was attempting to perform bulk deletion using the wrong class.

To fix this, we need to replace any calls to ActiveStorage::Variant.delete_all with ActiveStorage::VariantRecord.delete_all. The VariantRecord class is the proper ActiveRecord model that has access to the delete_all class method through its inheritance from ApplicationRecord.

Based on the existing test conventions shown in test/models/user_test.rb, I'm adding a new test file specifically for testing Active Storage variant record management. The test follows the established patterns of:

1. Using descriptive test names
2. Making assertions about expected behavior
3. Following the setup/exercise/verify pattern

The test will verify that:

1. Variant records can be deleted without errors
2. The operation actually removes records from the database

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