Question

在这里生气。任何指针都感激不尽！

我有一个交付模型，我正在尝试根据交付行添加一种方法来更新交付状态。此函数在模型类中定义，delivery_state是模型属性之一：

def updateDeliveryState
  expectedLines = DeliveryLine.where( :delivery_id => id,
                                      :line_state => 'EXPECTED' )
  logger.debug "State1: #{delivery_state}"

  if expectedLines.length == 0
    if delivery_state == 'EXPECTED' || delivery_state == 'RECEIVING'
      delivery_state = 'RECEIVED'               # commenting this line fixes it
      save
    end
  else
    logger.debug "State2: #{delivery_state}"
    if delivery_state == 'EXPECTED'
      logger.debug "Updating to receiving"
      delivery_state = 'RECEIVING'
      save
    end
  end
end

我在日志中看到的是在2 logger.debug行之间，delivery_state已被清除：

State1: EXPECTED
DeliveryLine Load (4.5ms)  SELECT "delivery_lines".* FROM "delivery_lines" 
WHERE "delivery_lines"."line_state" = 'EXPECTED' 
AND "delivery_lines"."delivery_id" = 227
State2:

如果我注释掉上面代码中标记的行，它似乎工作正常：

State1: EXPECTED
DeliveryLine Load (9.6ms)  SELECT "delivery_lines".* FROM "delivery_lines" 
WHERE "delivery_lines"."line_state" = 'EXPECTED' 
AND "delivery_lines"."delivery_id" = 227
State2: EXPECTED
Updating to receiving

但是，刷新后我可以看到，在此之后交付仍然是预期的？

Answer 1

详细说明我的评论：您似乎在if中创建了一个局部变量。看：

class Foo
  attr_accessor :bar

  def test
    unless bar
      bar = 1
    end
  end
end

f = Foo.new
f.test
puts f.bar # empty line, bar is nil

现在让我们确保调用setter：

class Foo
  attr_accessor :bar

  def test
    unless bar
      self.bar = 1
    end
  end
end

f = Foo.new
f.test
puts f.bar # prints 1

请参阅：Why do ruby setters need “self.” qualification within the class?

Answer 2

您可以尝试使用save(:validate => false)吗？

有时候Rails有这种讨厌的习惯，即默默地验证失败而不是保存。

你可能想要保存你的状态，无论什么......：）

Rails模型变量意外更改

2 个答案: