$: bundle exec rake spree_sample:drop_ship_orders --trace
Linking existing line items to suppliers
rake aborted!
PG::Error: ERROR: column "supplier_id" does not exist
LINE 1: ...ree_line_items".* FROM "spree_line_items" WHERE (supplier_i...
^
: SELECT "spree_line_items".* FROM "spree_line_items" WHERE (supplier_id IS NULL)