Question

在处理Rails应用程序并调查错误时，我将其缩小到以下情况，其中行AAA将导致events返回nil，在点XXX或YYYY之后不运行代码，但是行BBB工作正如所料。我每次都来回切换几次干净的环境，它总是表现得很奇怪。

Ruby 2.5.0，尚未尝试降级但我怀疑这个问题出现在2.3中（我使用此应用程序跳过了2.4）。

# this is the method that has the issue when called. It's in a PORO service object instantiated in a helper method & called from a Rails view.
def events
  @events ||= begin
    events = []
    # some code building up events
    events << :whatever if fulfillment.ready_to_process?
    #XXX -- execution never reaches here with #AAA. But no error is thrown, and events returns nil
    # some more code building up events
  end
end

# Fulfillment & LineItem are ActiveRecords
class Fulfillment
  def ready_to_process?
    # some "return false if" assertions
    result = line_items.any?(&:fulfillment_needed?) #AAA
    result = line_items.any?{ |line_item| line_item.fulfillment_needed? } #BBB
    # YYY -- exececution never reaches here with #AAA
    result
  end
end

class LineItem
  def fulfillment_needed?
    # various assertions
    true
  end
end

编辑：请注意，在出现错误的上下文中，fulfillment_needed？总是如此。

编辑2：实际上，我发现了另外一件遇到的事情？可以切换错误：

class LineItem
  has_many :vendor_line_items, dependent: :destroy

  def fulfillment_needed?
    return true if vendor_line_items.empty? # Displays the bug, AAA fails but BBB works
    return true # Does not display the bug AAA && BBB work
  end
end

vendor_line_items.empty?通常在其他地方表现。

什么可能导致＆符号 - 冒号块快捷方式失败，跳出两个堆栈帧？

0 个答案: