Search Rails 7 ActiveStorage filename with Ransack

I have a Rails 7.1.3 app that has ActiveStorage and Ransack installed. I have a model called Upload that has_one_attached :file. I would like to search by filename, using Ransack, in the uploads/index view. I have tried the answers here and the suggestion here, but neither are working. I have also tried to create lib/active_storage/attachment.rb and add the rasackable_attributes, but still no luck. The error I'm getting is Association named 'file' was not found on Upload; perhaps you misspelled it?. Anyone have any idea how to get this to work?

Here is my code:

^{# upload.rb}

has_one_attached :file

def self.ransackable_associations(auth_object = nil)
  ["file"]
end

^{# lib/active_storage/attachment.rb}

class ActiveStorage::Attachment < ApplicationRecord
  def self.ransackable_attributes(auth_object = nil)
    ["blob_id", "created_at", "id", "id_value", "name", "record_id", "record_type"]
  end
end

^{/uploads/index.html.erb}

<%= f.search_field :file_filename_cont, autofocus: true, placeholder: "Search by filename" %>

^{# controllers/uploads_controller.rb}

@q = Upload.ransack(params[:q])
@uploads = @q.result.includes(:file)

has_one_attached :file creates file_attachment and file_blob associations:
https://github.com/rails/rails/blob/v7.1.3.3/activestorage/lib/active_storage/attached/model.rb#L114-L115

you can use reflections to inspect associations:

>> Import.reflections.keys
=> ["file_attachment", "file_blob"]

ActiveStorage::Blob is where the actual filename is stored:

>> ActiveStorage::Blob
=> ActiveStorage::Blob(id: integer, key: string, filename: string, content_type: string, metadata: text, service_name: string, byte_size: integer, checksum: string, created_at: datetime)
#                                                ^^^^^^^^^^^^^^^^

Bring it all together:

# config/initializers/active_storage.rb

ActiveSupport.on_load(:active_storage_blob) do
  def self.ransackable_attributes(auth_object = nil)
    %w[filename]
  end
end

# app/models/import.rb

class Import < ApplicationRecord
  has_one_attached :file

  def self.ransackable_attributes(auth_object = nil)
    []
  end

  def self.ransackable_associations(auth_object = nil)
    ["file_blob"]
  end
end

# app/controllers/imports_controller.rb

class ImportsController < ApplicationController
  # GET /imports
  def index
    @q = Import.ransack(params[:q])
    @imports = @q.result
  end
end

# app/views/imports/index.html.erb

<%= search_form_for @q do |f| %>
  <%= f.label :file_blob_filename_cont %>
  <%= f.search_field :file_blob_filename_cont %>
<% end %>

<%= render @imports %>

Seems to work:

>> Import.ransack({"file_blob_filename_cont"=>"ava"}).result
=> [#<Import:0x00007f9101d16048 id: 1>]

>> Import.ransack({"file_blob_filename_cont"=>"asdf"}).result
=> []