Question

我有以下代码：

@temp = SalesOrder.where("status > ?", 0).ids
items = SalesOrderItem.where(sales_order_id: @temp).where.not(product_id: nil)

total = items.to_a.group_by(&:product_id).map do |product_id, quantity| 
  {:product_name => Product.find(product_id.to_i).name, 
   :quantity => quantity.sum { |q| q.quantity.to_f } }
end

@top_five = total.sort_by { |h| h[:quantity] }.reverse!

@top_five生成此数组：

[{:product_name => "Six", :quantity => 1300.0},
 {:product_name => "Plastic Tumbler 620ml", :quantity => 1205.0},
 {:product_name => "Product Four", :quantit y=> 1110.0},
 {:product_name => "Product Five", :quantity => 510.0},
 {:product_name => "Fiber Optic Cable", :quantity => 200.0}]

我需要它采用这种格式

{"Football" => 10, "Basketball" => 5}

或者

[["Football", 10], ["Basketball", 5]]

Answer 1

@temp = SalesOrder.where("status > ?", 0).ids
items = SalesOrderItem.where(sales_order_id: @temp).where.not(product_id: nil)
total = items.to_a.group_by(&:product_id).each_with_object({}) do |(product_id, quantity), total|
  total[Product.find(product_id.to_i).name] = quantity.map(&:quantity).map(&:to_f).sum
end
@top_five = total.sort_by { |k, v| v }.reverse!

检查一下。它应该工作。如果有任何错误，请ping我，我会更新它

PS：您的代码根本没有优化。所有这些都可以通过单个SQL查询来完成，但是在没有调试的情况下编写此查询非常困难

Rails：删除数组中的卷曲大括号

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