从this question开始，我花了一天时间尝试将累计销售总额添加到我的销售表中。这对我来说有点棘手（因为我想要），因为我希望isbn_id相同的销售总额，并且在该集合中，记录channel_id相同的位置 - 按invoice_date排名。这就是我可以计算特定销售单位范围内的特许权使用费。
这是我的非工作回调代码，在Sale模型中：
before_save :runningtotal
private
def runningtotal
@sale = Sale.order("invoice_date ASC")
@lastbal = @sale.find_all_by_isbn_id(@isbn).group_by(&:channel)
#that sucessfully gets all sales ranked by date ascending, then groups them by channel, just for the current isbn.
@lastbal.each do |channel, sale|
sale.each_with_index do |sale, i|
previous_sale = sale[i-1] unless i==0
next unless previous_sale
@total_quantity = previous_sale.quantity + :quantity
write_attribute(:total_quantity,@total_quantity)
end
end
end
这大致是应该如何编写回调 - 只是在模型中？是否只是在新的销售之前疯狂地运行？
我的核心问题是：我如何将属性“total_quantity”更新为当前记录的“数量”之和，以及在before_save回调中的日期前一条记录的“total_quantity”，在约束条件下isbn_id和channel_id的发现？
这是find的输出：
ruby-1.9.2-p180 :025 > @lastbal = @sale.find_all_by_isbn_id(@isbn).group_by(&:channel)
=> {#<Channel id: 4, isbn_id: nil, channel_name: "Gratis", created_at: "2011-05-26 11:08:22", updated_at: "2011-05-26 11:08:22">=>[#<Sale id: 26, isbn_id: 2, quantity: 10000, value: 40000, currency: "", total_quantity: nil, created_at: "2011-05-26 11:11:30", updated_at: "2011-05-26 11:11:30", customer: "6", retail_price: nil, discount: nil, channel_id: 4, invoice_date: "2011-05-18", rule_id: nil, trenche: nil>], #<Channel id: 1, isbn_id: nil, channel_name: "Home", created_at: "2011-05-16 19:47:27", updated_at: "2011-05-16 19:47:27">=>[#<Sale id: 22, isbn_id: 2, quantity: 1000, value: 5193, currency: "", total_quantity: nil, created_at: "2011-05-25 19:46:03", updated_at: "2011-05-25 19:46:03", customer: "a", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2011-05-11", rule_id: nil, trenche: nil>, #<Sale id: 24, isbn_id: 2, quantity: 1000, value: 4394, currency: "", total_quantity: nil, created_at: "2011-05-26 09:48:16", updated_at: "2011-05-26 09:48:16", customer: "g", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2011-05-10", rule_id: nil, trenche: nil>, #<Sale id: 25, isbn_id: 2, quantity: 1000, value: 4394, currency: "", total_quantity: nil, created_at: "2011-05-26 10:02:38", updated_at: "2011-05-26 10:02:38", customer: "g", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2011-05-05", rule_id: nil, trenche: nil>, #<Sale id: 21, isbn_id: 2, quantity: 1000, value: 5193, currency: "", total_quantity: nil, created_at: "2011-05-25 14:12:45", updated_at: "2011-05-25 14:12:45", customer: "a", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2010-10-15", rule_id: nil, trenche: nil>, #<Sale id: 13, isbn_id: 2, quantity: 50, value: 159, currency: "", total_quantity: nil, created_at: "2011-05-25 12:33:09", updated_at: "2011-05-25 12:33:09", customer: "a", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2010-01-01", rule_id: nil, trenche: nil>, #<Sale id: 14, isbn_id: 2, quantity: 25, value: 129, currency: "", total_quantity: nil, created_at: "2011-05-25 12:33:23", updated_at: "2011-05-25 12:33:23", customer: "", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2010-01-01", rule_id: nil, trenche: nil>, #<Sale id: 12, isbn_id: 2, quantity: 100, value: 415, currency: "", total_quantity: nil, created_at: "2011-05-25 12:32:50", updated_at: "2011-05-25 15:13:21", customer: "a", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2001-10-01", rule_id: nil, trenche: nil>, #<Sale id: 11, isbn_id: 2, quantity: 500, value: 2197, currency: "", total_quantity: nil, created_at: "2011-05-25 12:32:24", updated_at: "2011-05-25 15:11:20", customer: "a", retail_price: nil, discount: nil, channel_id: 1, invoice_date: "2000-10-01", rule_id: nil, trenche: nil>], #<Channel id: 2, isbn_id: nil, channel_name: "Export", created_at: "2011-05-16 19:47:35", updated_at: "2011-05-16 19:47:35">=>[#<Sale id: 23, isbn_id: 2, quantity: 2000, value: 5000, currency: "", total_quantity: nil, created_at: "2011-05-26 09:16:15", updated_at: "2011-05-26 09:16:15", customer: "v", retail_price: nil, discount: nil, channel_id: 2, invoice_date: "2011-05-02", rule_id: nil, trenche: nil>, #<Sale id: 17, isbn_id: 2, quantity: 242, value: 657, currency: "", total_quantity: nil, created_at: "2011-05-25 12:34:24", updated_at: "2011-05-25 12:34:24", customer: "b ", retail_price: nil, discount: nil, channel_id: 2, invoice_date: "2010-10-15", rule_id: nil, trenche: nil>, #<Sale id: 18, isbn_id: 2, quantity: 54, value: 194, currency: "", total_quantity: nil, created_at: "2011-05-25 12:34:44", updated_at: "2011-05-25 12:34:44", customer: "b ", retail_price: nil, discount: nil, channel_id: 2, invoice_date: "2010-10-15", rule_id: nil, trenche: nil>, #<Sale id: 15, isbn_id: 2, quantity: 135, value: 377, currency: "", total_quantity: nil, created_at: "2011-05-25 12:33:48", updated_at: "2011-05-25 12:33:48", customer: "b ", retail_price: nil, discount: nil, channel_id: 2, invoice_date: "2010-09-15", rule_id: nil, trenche: nil>, #<Sale id: 16, isbn_id: 2, quantity: 433, value: 830, currency: "", total_quantity: nil, created_at: "2011-05-25 12:34:06", updated_at: "2011-05-25 12:34:06", customer: "b ", retail_price: nil, discount: nil, channel_id: 2, invoice_date: "2010-09-15", rule_id: nil, trenche: nil>]}
以下是我的销售模型中的列：
# id :integer not null, primary key
# isbn_id :integer
# quantity :integer
# value :integer
# currency :string(255)
# total_quantity :integer
# created_at :datetime
# updated_at :datetime
# customer :string(255)
# retail_price :integer
# discount :decimal(, )
# channel_id :integer
# invoice_date :date
# rule_id :integer
提前非常感谢。
更新：最终解决方案。
真的不确定这会像'回馈社区'一样，因为它是滑稽的，而不是DRY，充满了我用来弄清楚所有错误的看跌期权，而且格式错误，无法启动，但是，我是一个菜鸟，至少我可以回到这里，在我知道自己在做什么的几年里嘲笑自己。所以，这是我的最终解决方案，在Sale.rb.可怜的过度模型。有一天我会重构这个。
before_save :runningtotal
after_commit :refresh
private
def runningtotal
# get the latest sale that matches the new sale's isbn and channel id, then rank by invoice date descending, and get the first record:
lastsale = Sale.where(:isbn_id => self.isbn_id).where(:channel_id => self.channel_id).order("invoice_date DESC").first
allsales = Sale.where(:isbn_id => self.isbn_id).where(:channel_id => self.channel_id).order("invoice_date DESC")
# set the total_quantity field in the new sales record to its quantity + the last sale's total.
if allsales.maximum(:invoice_date).nil?
puts "runningtotal thinks the max of invoice date in the allsales relation is nil"
puts "and runningtotal is setting total_quantity on the new sale to be #{self.quantity + (lastsale.try(:total_quantity) || 0)}"
self.total_quantity = self.quantity + (lastsale.try(:total_quantity) || 0)
else
if self.invoice_date < allsales.maximum(:invoice_date)
puts "the runningtotal method has been skipped because runningtotal thinks the current invoice date is less than the highest invoice date in the allsales relation"
else
puts "this is a normal entry so runningtotal has set the total quantity to be #{self.quantity + (lastsale.try(:total_quantity) || 0) }"
self.total_quantity = self.quantity + (lastsale.try(:total_quantity) || 0)
end
end
end
def refresh
allsales = Sale.where(:isbn_id => self.isbn_id).where(:channel_id => self.channel_id).order("invoice_date ASC")
#if the runningtotal callback hasn't run, the total quantity will be nil, and nil triggers this after_commit callback
if total_quantity.nil?
puts "running refresh callback"
puts "here's a sample parameter pass: id: #{id} quantity: #{quantity} date: #{invoice_date} "
puts "allsales class is #{allsales.class}"
# if the new sale that's being saved has a date that's before any previous sale...
puts "before the if, refresh thinks that the earliest invoice date is #{allsales.minimum(:invoice_date)} and that invoice date is #{invoice_date}"
if invoice_date <= allsales.minimum(:invoice_date)
puts "date earlier than existing sales dates"
puts "refresh thinks that the earliest invoice date is #{allsales.minimum(:invoice_date)} and that invoice date is #{invoice_date}"
#... then set its total_quantity to the sale quantity...
update_attribute(:total_quantity, quantity)
puts "total_qty updated with qty"
# ... and update all subsequent records' total_quantity (skipping the before_save callback which would trigger an infinite loop).
allsales.each_with_index do |sale, i|
previous_sale = allsales[i-1] unless i==0
next unless previous_sale
puts "getting qty out of arel when date earlier than others: #{previous_sale.quantity}"
puts "this is adding #{quantity} to #{previous_sale.quantity } which is #{quantity + previous_sale.total_quantity }"
Sale.skip_callback(:save, :before, :runningtotal )
sale.update_attribute(:total_quantity, (sale.quantity + previous_sale.total_quantity ))
Sale.set_callback(:save, :before, :runningtotal)
end
else
# if the invoice date is within the min and max range of the previous sales...
# ... update all previous and subsequent records' total_quantity (skipping the before_save callback which would trigger an infinite loop).
allsales.each_with_index do |sale, i|
previous_sale = allsales[i-1] unless i==0
next unless previous_sale
puts "getting qty out of arel within existing date range: #{previous_sale.quantity}"
puts "this is adding #{quantity} to #{previous_sale.quantity } which is #{quantity + previous_sale.total_quantity }"
Sale.skip_callback(:save, :before, :runningtotal )
sale.update_attribute(:total_quantity, (sale.quantity + previous_sale.total_quantity ))
Sale.set_callback(:save, :before, :runningtotal )
end
end
end
end
答案 0 :(得分：1)
是的，在模型中使用before_save将在每次保存时运行，无论是新的还是更新的。因此，您需要在计算中注意期望当前（新）记录尚不存在。 ;）您可能希望使用before_save, :on => :create将其限制为创建操作。
但是，如果我理解您对该问题的英语陈述，那么您的代码就会令人费解。我甚至不知道@isbn的位置，这可能是危险的......
这是否需要更新其他对象上的isbn和channel？通常，根据需要简单地计算，而不是尝试在每个记录中缓存总数，这是更好的形式。
在回调中，self是当前（新的？）记录，因此请使用它来引用新值。
@sale = Sale.order("invoice_date ASC")
@lastbal = @sale.find_all_by_isbn_id(@isbn).group_by(&:channel)
我认为可以替换为
@lastbal = Sale.order("invoice_date ASC").where(:isbn_id => self.isbn_id).group_by(&:channel)
我假设@isbn实际上是新纪录的isbn。
从那里开始，我不确定你是打算更新新记录还是旧记录...如果你想更新当前记录，只需设置属性并退出回调，它就会是保存其余部分时保存：
self.total_quantity = previous_sale.quantity + self.quantity
如果您打算更新其他对象，那么我们必须更新这些对象并保存它们。我在你的代码中看不到这一切。
你的代码经历了几次循环，可能多次点击write_attribute ......这没有用。
如果您的意思是想要找到与当前isbn匹配的最后一条记录以及更新新记录的频道，请按以下步骤操作：
def runningtotal
lastsale = Sale.where(:isbn_id => self.isbn_id).
where(:channel_id => self.channel_id).
order("invoice_date DESC").first
# that should be the latest sale that matches
# the current isbn and channel
self.total_quantity = self.quantity + (lastsale.try(:total_quantity) || 0)
# watch out for nil if no previous record exists ^
end
`