In the case where the variant has not been saved yet, we can use #new_record? here instead of #stock_items.empty?, to avoid an additional query. This can be called a vast number of times per request, in various N+1s. The other case where we need to return here is when a variant has been deleted, so #stock_items will be empty and #stock_item will be nil. Likewise, we can just check that with #deleted? and avoid #stock_items.empty?
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