Django与动态模型的关系

Question

I have one main model :

ToolBox

and three other models :

Hammer
Nail
Plier

Obviously a ToolBox can contain any combination of Hammers, Nails or Pliers.

Using Django, what is a good ORM representation of this dynamic type of relationship? Bare in mind that each of these models can have its own rich set of attributes so a simple type field won't do the job. I am also wondering how the admin interface in Django can be fine tuned to this dynamic type of thing if it works.

Answer 1

I am not sure what you mean by dynamic, your example is quite typical I think.

But anyway, in order to avoid the situation:

Toolbox
    many2many(Hammer)
    many2many(Nail)
    etc... (add new m2m field every time you add another tool class)

I would do it like this:

Toolbox

Hammer
    foreignkey(Toolbox)

Nail
    foreignkey(Toolbox)

This will make things much easier to implement (use toolbox.hammer_set, etc). If the Hammer, Nail, etc have some fields in common you can also define an abstract base class (eg Tool) that holds all common fields.