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If the migration reports that the migration was successful but the counts do not match, it could be that parent objects have been deleted orphaning SupplementalFiles, a known problem.

MediaObject Section List Migration

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Avalon 7.8 moves data about section order from a separate fedora object to a property on the MediaObject model to be more performant when objects have many sections. The MediaObject model is already coded to lazily migrate existing objects whenever they are saved and this migration will finish updating objects that haven’t already been migrated.

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Code Block

RAILS_ENV=production bundle exec rails r "ActiveFedora::SolrService.instance.conn.get('select', params: { rows: 1_000_000, q: 'has_model_ssim:MediaObject', fl: [:id, :section_list_ssim], sort: 'id asc' })['response']['docs'].each {|doc| puts \"#{doc['id']}: section_ids: #{JSON.parse(doc['section_list_ssim'].first || '[]').to_s}\" }" > log/section_list_dump.post_migration.txt diff -awu log/section_list_dump.pre_migration.txt log/section_list_dump.post_migration.txt

Note
Note that while the migration is running there will be duplicate values in the format facet in search results. The indexed value of the format changed in 7.8 so both will appear until all items have been migrated.

Upgrade Steps

For Manual Installations

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