Django：模型实例历史 [英] Django : Model Instance history

问题描述

在我的项目中，我必须处理上传的文件，我想要有每个文件版本的历史记录。并在一个视图中显示历史。
在我的模型中，每个文件都有一个版本，一个名字和一个路径。该文件与一个对多关系的另一个类A相关。
我想要一个替换前一个文件的更新函数，我也想访问具有文件及其相关模型实例（A类）的所有特征的历史记录。

In my project, I have to handle uploaded files, and I want to have an history of each file version. And to display the history in one view. In my model, each file has a version, a name and a path. This file is related to an other class 'A' by a one to many relationship. I want to have a sort of update function which replace the former file, and I also want to have access to the history with all characteristics of the file and its related model instances (class A).

我不知道该怎么办。我听说过django反转和django修订。
你建议给我什么？

I don't know how to do. I heard about django reversion and django revisions. What do you advise to me ?

谢谢

推荐答案

您可以通过以下几种方法：

You can do it a couple of ways:

1.您可以拥有手动跟踪其的文档文件模型。

1.You can have a document file model which keeps track of it manually.

class DocumentFile(CachedModel):
   content_type    = models.ForeignKey(ContentType, null=True, blank=True)
   object_id       = models.PositiveIntegerField(null=True, blank=True)
   content_object  = generic.GenericForeignKey(ct_field='content_type', fk_field='object_id')       
   file = models.FileField(upload_to= wherever )
   version = models.PositiveIntegerField(default=1)

   class Meta:
        db_table = 'document_file'
        verbose_name = 'Document File'
        unique_together = ('document', 'version')

您可以拥有一个名为new_version的post_save信号，并更新当前版本号在文件

You can have a post_save signal called new_version, and update the current revision number on the document

2.你甚至可以使用亚马逊的s3来存储文档，并通过修订版号访问它，获取修订号的get参数（这是一个更昂贵的方法）

2.You May even use amazon's s3 to store the document, and access it by revision number passing it a get parameter for the revision number(This is a costlier approach)

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