如何查询在工作班次内创建的记录？

Question

我有一个Rails应用程序具有一个SQLite数据库中具有一个位移表，其中，每个移位具有时间指示换档开始小时值类型的beginning_at柱。另外值为的时间的end_at列指示班次结束的小时。

事实上这个表只有两个记录; Morning Shiftbegins_at上午10点和ends_at当天下午5点30分。第二个记录是Evening Shiftbegins_at 6.30 pm和ends_at第二天凌晨2点。

另外我还有订单表格说明每个订单belongs_to一个班次。

问题是，我想有一个控制器的操作，可索引的所有订单，从创建的：伊始，其中转移这一行动引发的，直到这班结束。

这个动作实际上的目的是审查在每个工作班次结束的销量

我想这一切结束了，但我无法找到起点，请帮帮我。这对我的应用程序非常重要。

Answer 1

我不会假装永远的唯一可能的解决方案，但试试这个：

# orders.rb 
class Order < ActiveRecord::Base 
    belongs_to :shift 

    scope :at_morning_shift, -> { where(shift: Shift.morning).order('created_at asc') } 
    scope :at_night_shift, -> { where(shift: Shift.night).order('created_at asc') } 

    def self.current_shift 
    begins_time, ends_time = Shift.morning.begins_at, Shift.morning.ends_at 
    if (begins_time.hour..ends_time.hour).cover?(Time.now.hour) 
     Order.at_morning_shift 
    else 
     Order.at_night_shift 
    end 
    end 
end 


# shift.rb 
class Shift < ActiveRecord::Base 
    has_many :orders 

    def self.morning 
    find_by_name("Morning shift") 
    end 

    def self.night 
    find_by_name("Night shift") 
    end 

end 

# orders_controller.rb 
class OrdersController < ApplicationController 

    def index 
    @orders = Order.current_shift 
    end 
end 

这里是控制台输出：

[86] pry(main)> Time.now.utc 
=> 2016-08-22 05:05:50 UTC 
[87] pry(main)> Order.current_shift 
    Shift Load (0.3ms) SELECT "shifts".* FROM "shifts" WHERE "shifts"."name" = $1 LIMIT 1 [["name", "Morning shift"]] 
    Shift Load (0.2ms) SELECT "shifts".* FROM "shifts" WHERE "shifts"."name" = $1 LIMIT 1 [["name", "Morning shift"]] 
    Shift Load (0.2ms) SELECT "shifts".* FROM "shifts" WHERE "shifts"."name" = $1 LIMIT 1 [["name", "Night shift"]] 
    Order Load (0.3ms) SELECT "orders".* FROM "orders" WHERE "orders"."shift_id" = 2 ORDER BY created_at asc 
=> [#<Order:0x007fbdc88888c0 id: 1, name: "molestiae", phone: nil, product_id: nil, created_at: Mon, 22 Aug 2016 04:32:53 UTC +00:00, updated_at: Mon, 22 Aug 2016 04:32:53 UTC +00:00, shift_id: 2>, 
#<Order:0x007fbdc8888730 id: 5, name: "explicabo", phone: nil, product_id: nil, created_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, updated_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, shift_id: 2>, 
#<Order:0x007fbdc8888578 id: 6, name: "cupiditate", phone: nil, product_id: nil, created_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, updated_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, shift_id: 2>, 
#<Order:0x007fbdc88883e8 id: 7, name: "rerum", phone: nil, product_id: nil, created_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, updated_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, shift_id: 2>, 
#<Order:0x007fbdc8888258 id: 8, name: "totam", phone: nil, product_id: nil, created_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, updated_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, shift_id: 2>, 
#<Order:0x007fbdc88880c8 id: 9, name: "inventore", phone: nil, product_id: nil, created_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, updated_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, shift_id: 2>, 
#<Order:0x007fbdc8883ed8 id: 11, name: "saepe", phone: nil, product_id: nil, created_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, updated_at: Mon, 22 Aug 2016 04:33:40 UTC +00:00, shift_id: 2>] 
[88] pry(main)> 

请记住，你要注意到您的应用程序和客户端的time_zone。但基本方法将保持不变。