Rails-如何计算Rails的每日，每周和每月总价

Question

我有带有参数:quantity, :price的售票机型号

in my application.record.rb
def total_price
 Ticket.sum(:price)
end

in my ticket index
<% @tickets.each do |t| %>
  t.total_price
<% end %>

它可以工作，但可以计算出机票总价。

我想要的是我可以将每日总价，每周总价和每月总价分开。

该怎么做？ 请帮忙，谢谢..

Answer 1

每日总价

def daily_total_price
 Ticket.where("created_at >= ? AND created_at < ?", Time.now.beginning_of_day, Time.now.end_of_day).sum(:subtotal)
end

每周总价

def weekly_total_price
 Ticket.where("created_at >= ?", Time.now.beginning_of_week).sum(:subtotal)
end

每月总价

def monthly_total_price
 Ticket.where("created_at >= ?", Time.now.beginning_of_month).sum(:subtotal)
end

总共过去7天

def last_7_day_total_price
  Ticket.where("created_at >= ? ", (Date.today - 7.days).beginning_of_day).sum(:subtotal)
end

最近30天

def last_30_day_total_price
  Ticket.where("created_at >= ? ", (Date.today - 30.days).beginning_of_day).sum(:subtotal)
end

可见

<% @tickets.each do |t| %>
  Daily total price: - <%=t.daily_total_price%>
  Weekly total price: - <%=t.weekly_total_price%>
  #.....so on..
<% end %>

Answer 2

您可以使用以下模型作用域-

class Ticket < ApplicationRecord

  scope :daily_total_price, ->(date_time = Time.now) { where('created_at BETWEEN ? AND ?',date_time.beginning_of_day, date_time.end_of_day).sum(:subtotal) }
  scope :weekly_total_price, ->(date_time = Time.now) { where('created_at BETWEEN ? AND ?',date_time.beginning_of_week, date_time.end_of_week).sum(:subtotal) }
  scope :monthly_total_price, ->(date_time = Time.now) { where('created_at BETWEEN ? AND ?',date_time.at_beginning_of_month, date_time.end_of_month).sum(:subtotal) }

  scope :last_7d_total_price, ->(date_time = Time.now) { where('created_at >= ?', (date_time - 7.days).beginning_of_day).sum(:subtotal) }
  scope :last_30d_total_price, ->(date_time = Time.now) { where('created_at >= ?', (date_time - 30.days).beginning_of_day).sum(:subtotal) }

end

范围的使用

Ticket.daily_total_price # For daily scope 
Ticket.weekly_total_price # For Weekly scope 
Ticket.monthly_total_price # For monthly scope 
Ticket.last_7d_total_price # For last 7 days scope 
Ticket.last_30d_total_price # For 30 days scope 

您还可以传递一个特定的日期作为参数

# With time zone
date_time_with_zone = Time.zone.parse("2018-09-30")
Ticket.daily_total_price(date_time_with_zone)

# Without time zone
date_time = Time.parse("2018-09-30")
Ticket.daily_total_price(date_time)

我希望它能满足您的要求。