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Ruby on rails Rails客户端订单历史记录在一个查询中_Ruby On Rails_Postgresql_Associations_Aggregate Functions - Fatal编程技术网
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  • Ruby on rails Rails客户端订单历史记录在一个查询中

Ruby on rails Rails客户端订单历史记录在一个查询中

ruby-on-rails postgresql

Ruby on rails Rails客户端订单历史记录在一个查询中,ruby-on-rails,postgresql,associations,aggregate-functions,Ruby On Rails,Postgresql,Associations,Aggregate Functions,我正在尝试生成一个客户配置文件页面。该页面包括客户订单历史记录、最新订单及其历史总计。我一直在运行sum、count和average on Customer.where_已完成，但这涉及到该数据库三次。我觉得一定有更好的办法 @customers_total_spent = @customer.orders.where_completed.sum(:sale) @customers_average_per_order = @customer.orders.where_completed.aver

我正在尝试生成一个客户配置文件页面。该页面包括客户订单历史记录、最新订单及其历史总计。我一直在运行sum、count和average on Customer.where_已完成，但这涉及到该数据库三次。我觉得一定有更好的办法

@customers_total_spent = @customer.orders.where_completed.sum(:sale)
@customers_average_per_order = @customer.orders.where_completed.average(:sale)
@customers_total_orders = @customer.orders.where_completed.count(:sale)
客户 
class客户
命令 
类顺序{where.not（completed_at:nil）}
结束
您应该试试这个

orders_completed = @customer.orders.where_completed.pluck("sum(sale), avg(sale), count(sale)").flatten
@customers_total_spent = orders_completed[0]
@customers_average_per_order = orders_completed[1]
@customers_total_orders = orders_completed[2]
你应该试试这个

orders_completed = @customer.orders.where_completed.pluck("sum(sale), avg(sale), count(sale)").flatten
@customers_total_spent = orders_completed[0]
@customers_average_per_order = orders_completed[1]
@customers_total_orders = orders_completed[2]

orders_completed = @customer.orders.where_completed.pluck("sum(sale), avg(sale), count(sale)").flatten
@customers_total_spent = orders_completed[0]
@customers_average_per_order = orders_completed[1]
@customers_total_orders = orders_completed[2]

@qry = @customer.orders.where_completed.select("sum(sale) as sum, avg(sale) as avg, count(sale) as count").first
@customers_total_spent = @qry.sum
@customers_average_per_order = @qry.avg
@customers_total_orders = @qry.count