Speed up file data migration

app/models/model_file.rb

@@ -75,14 +75,18 @@ def path_within_library
     File.join(model.path, filename)
   end
 
-  def attach_existing_file!
-    return if attachment.present?
+  def attach_existing_file!(refresh: true)
+    return if attachment.present? || !File.exist?(absolute_path)
     attachment_attacher.set Shrine.uploaded_file(
       storage: model.library.storage_key,
       id: path_within_library,
-      metadata: {filename: basename(include_extension: true)}
+      metadata: {
+        filename: basename(include_extension: true),
+        size: attributes["size"],
+        mime_type: Mime::Type.lookup_by_extension(File.extname(filename).delete(".").downcase).to_s
+      }
     )
-    attachment_attacher.refresh_metadata!
+    attachment_attacher.refresh_metadata! if refresh
     save!
   end
 

db/data/20240615085913_move_file_data_into_shrine.rb

@@ -2,7 +2,7 @@
 
 class MoveFileDataIntoShrine < ActiveRecord::Migration[7.0]
   def up
-    ModelFile.find_each(&:attach_existing_file!)
+    ModelFile.find_each { |x| x.attach_existing_file!(refresh: false) }
   end
 
   def down

spec/jobs/analysis/file_conversion_job_spec.rb

@@ -44,7 +44,7 @@
     it "avoids filenames that already exist" do
       allow(File).to receive(:exist?).with(file.absolute_path.gsub(".stl", ".3mf")).and_return(true).once
       allow(File).to receive(:exist?).with(file.absolute_path.gsub(".stl", "-1.3mf")).and_return(true).once
-      allow(File).to receive(:exist?).with(file.absolute_path.gsub(".stl", "-2.3mf")).and_return(false).once
+      allow(File).to receive(:exist?).with(file.absolute_path.gsub(".stl", "-2.3mf")).and_return(false)
       described_class.perform_now(file.id, :threemf)
       expect(ModelFile.where.not(id: file.id).first.filename).to eq "files/awesome-2.3mf"
     end