after_create不会在数据库中创建更改

I use a after_create call back to calculate the penalty of a submitted HomeworkDocument, based on the deadline of the Assignment that HomeworkDocument belongs_to.

我使用after_create回调来计算提交的HomeworkDocument的惩罚,基于HomeworkDocument belongs_to的赋值的截止日期。

  class HomeworkDocument < ActiveRecord::Base

  after_create :calculate_penalty
  private

    def calculate_penalty
      time_late = created_at - assignment.deadline
      case
      when time_late < 0
        self.penalty = 0
      when time_late > 1.day
        self.penalty = 1
      end
    end

Everything works fine in my spec as well as when I create HomeworkDocument one at a time in the console. However, when using loop (e.g. to populate sample data), the call back seems to be bypassed as all of the homework documents have penalty: nil.

在我的规范中以及在控制台中一次创建一个HomeworkDocument时,一切正常。但是,当使用循环(例如填充样本数据)时,似乎绕过了回调,因为所有的家庭作业文件都有惩罚:零。

The loop is very straightforward:

循环非常简单:

   Student.all.each do |student|
      Assignment.all.each do |assignment|
        student.submitted_homework_documents.create(
          assignment_id: assignment.id,
          created_at: rand(-1.month..1.month).ago)
      end
   end

Is this expected? If so, how do I create my sample data with the after_create call back properly applied?

这是预期的吗?如果是这样,如何在正确应用after_create回调的情况下创建示例数据?

1 个解决方案

#1

You just need to a add a call to save the instance of the HomeworkDocument, so use self.save.

您只需要添加一个调用来保存HomeworkDocument的实例,所以使用self.save。

def calculate_penalty
  time_late = created_at - assignment.deadline
  case
  when time_late < 0
    self.penalty = 0
  when time_late > 1.day
    self.penalty = 1
  end
  self.save
end