> class Container(models.Model):
> # This is my container model. It will later be displayed as its
> # title and a list of *Thing instances which all are formatted
> # in a different fashion.
> # ofc each Container can contain any number of any *Thing model
> # instance
> title = models.CharField(maxlength = 256)
> # snip!
>
> class ImageThing(models.Model):
> image = models.ImageField() #...
> container = models.ForeignKey(Container)
> sort_order= models.SmallIntegerField()
>
> class TextThing(models.Model):
> text = models.TextField()
> container = models.ForeignKey(Container)
> sort_order= models.SmallIntegerField()
>
> # In my program this continues. I have about 10 *Thing models
>
> Now what i want is to get all *Thing instances that are related to my
> Container instance and at the same time order all of them by their
> sort_order field.
You can create one model that will serve as a basic child inside a
container. Type specific models would then related to it as one-to-one
(sorta inherited models):
Container
|
+---- Thing ---- ImageThing
|
+---- Thing ---- TextThing
In code this will look like this:
class Container(model.Model):
title = models.CharField(maxlength=256)
class Thing(model.Models):
# keeps container-related fields common to all things
container = models.ForeignKey(Container)
sort_order = models.SmallIntegerField()
class ImageThing(model.Models):
thing = models.OneToOneField(Thing)
image = models.ImageField()
class TextThing(model.Models):
thing = models.OneToOneField(Thing)
text = models.TextField()
Then you can add a fancy methods to Thing that will return its typed
counterpart (sorta "polymorphism"):
class Thing(models.Model):
...
def data(self):
return getattr(self, 'image_thing', None) or \
getattr(self, 'text_thing', None) or \
getattr(self, 'another_thing')
def __str__(self):
return str(self.data())
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