backend/db/migrate/20260626010000_backfill_initial_material_versions.rb

@@ -1,3 +1,5 @@
+require 'json'
+
 class BackfillInitialMaterialVersions < ActiveRecord::Migration[8.0]
   class MigrationMaterial < ActiveRecord::Base
     self.table_name = 'materials'
@@ -143,7 +145,7 @@ class BackfillInitialMaterialVersions < ActiveRecord::Migration[8.0]
         file_content_type: blob.content_type,
         file_byte_size: blob.byte_size,
         file_checksum: blob.checksum,
-        file_sha256: blob.metadata['sha256']
+        file_sha256: blob_metadata(blob)['sha256']
       }
     end
   end
@@ -156,4 +158,14 @@ class BackfillInitialMaterialVersions < ActiveRecord::Migration[8.0]
       file_checksum: nil,
       file_sha256: nil }
   end
+
+  def blob_metadata blob
+    metadata = blob.metadata
+    return metadata if metadata.is_a?(Hash)
+    return { } if metadata.blank?
+
+    JSON.parse(metadata)
+  rescue JSON::ParserError
+    { }
+  end
 end