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- bundle exec rails g migration add_parent_folder_ref_to_folders parent_folder:references
- # This creates a change method, but I rename it to up and add a down method, to allow rollback
- # I also manually added foreign_key for integrity (default to false)
- class AddParentFolderRefToFolders < ActiveRecord::Migration
- def up
- add_reference :folders, :parent_folder, index: true, foreign_key: true
- end
- def down
- remove_reference :folders, :parent_folder, index: true, foreign_key: true
- end
- end
- # Run bundle exec rake db:migrate
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