Ruby on rails 如何在哈希数组中按分组
我有一个哈希数组 我需要能够按用户对它们进行分组Ruby on rails 如何在哈希数组中按分组,ruby-on-rails,arrays,group-by,Ruby On Rails,Arrays,Group By,我有一个哈希数组 我需要能够按用户对它们进行分组 order = Order.find(options[:order_id]) shipments = order.shipments.select {|shipment| shipment["roundtrip_shipment"] == nil }.collect {|o| { id: o.id, user_id: o.user_id, ... } } 我在数
order = Order.find(options[:order_id])
shipments = order.shipments.select {|shipment| shipment["roundtrip_shipment"] == nil }.collect {|o| {
id: o.id,
user_id: o.user_id,
...
} }
我在数组中创建group by时遇到一些问题
我已尝试按{| shipping | shipping[:user_id]}.count执行shippings=order.shippings.group_
但当我知道这里有2个用户时,它总是返回1
感谢所有帮助您只需执行以下操作:
order = Order.find(options[:order_id])
shipments = order.shipments.where.not(roundtrip_shipment: nil).group_by(&:user_id).collect {|x,y| {x => y.map(&:id)} }
您可以简单地执行以下操作:
order = Order.find(options[:order_id])
shipments = order.shipments.where.not(roundtrip_shipment: nil).group_by(&:user_id).collect {|x,y| {x => y.map(&:id)} }
您可以简单地执行以下操作:
order = Order.find(options[:order_id])
shipments = order.shipments.where.not(roundtrip_shipment: nil).group_by(&:user_id).collect {|x,y| {x => y.map(&:id)} }
您可以简单地执行以下操作:
order = Order.find(options[:order_id])
shipments = order.shipments.where.not(roundtrip_shipment: nil).group_by(&:user_id).collect {|x,y| {x => y.map(&:id)} }
谢谢我感谢你的帮助谢谢你的帮助谢谢你的帮助谢谢你的帮助谢谢你的帮助