You probably want to look at abstract models in Django. It's also known as
concrete inheritance in some ORMs
--
Jani Tiainen
On Tuesday 25 January 2011 09:42:08 akaariai wrote:
> Hello all,
>
> My problem is as follows: I have content (for simplicity, lets say
> articles), and some content related to that (authors for the example).
> I would like to add the ability for users to create versions of the
> content. The procedure from user perspective is as follows: they click
> a button ("create new version") and supply some details about the
> update.
>
> Now, I would like to automatically generate dual tables for articles
> and content which would be versioned. That is, when users click
> "create new version" my software should insert the current data into
> the dual tables so that it is possible to go back to each published
> version.
>
> The problem I am facing is this: I would like to create automatically
> the dual tables. I haven't thought about the schema much, but I
> probably don't need anything more than the base tables + an integer
> column version. Is there any relatively easy way to create the dual
> tables automatically? That is, is it possible to read the models I
> have currently and create the dual table without me having to copy all
> the definitions. For example, given the article model:
>
> class Author(models.Model):
> name = models.TextField()
>
> class Article(models.Model):
> id = models.AutoField()
> text = models.TextField()
> authors = models.ManyToManyField(Author)
>
> I would like to create automatically (in runtime or just create the
> models.py file automatically running a script) the dual models:
>
> class AuthorDual(models.Model):
> name = models.TextField()
> version = models.PositiveIntegerField()
>
> class ArticleDual(models.Model):
> id = models.AutoField()
> text = models.TextField()
> authors = models.ManyToManyField(AuthorDual)
> version = models.PositiveIntegerField()
>
> Has anybody done anything similar? Any pointers where to look for
> similar code? And is this doable in sane amount of time?
>
> Thanks in advance,
> - Anssi
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