foodsoft/db/migrate/20140318173000_delete_empty_group_order_articles.rb

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class DeleteEmptyGroupOrderArticles < ActiveRecord::Migration[4.2]
def up
# up until recently, group_order_articles with all quantities zero were saved
GroupOrderArticle.where(quantity: 0, tolerance: 0, result: [0, nil], result_computed: [0, nil]).delete_all
end
def down; end
end