Explicitly select `spree_products_taxons.position` attribute
Explicitly select `spree_products_taxons.position` attribute

PostgreSQL is very picky when building a SQL query that requires
SELECT and ORDER BY methods; the attribute you want to use to sort
the results must be explicitly selected; otherwise, PG raises an
exception

pervino/solidus,pervino/solidus,pervino/solidus,pervino/solidus