Hi everyone! :)
I just stumbled upon the hardest problem I ever had with Django Rest
Framework. Let me give you my models first, and then explain:
class Stampcardformat(models.Model):
workunit = models.ForeignKey(
Workunit,
on_delete=models.CASCADE
)
uuid = models.UUIDField(
default=uuid.uuid4,
editable=False,
unique=True
)
limit = models.PositiveSmallIntegerField(
default=10
)
category = models.CharField(
max_length=255
)
class Stampcard(models.Model):
stampcardformat = models.ForeignKey(
Stampcardformat,
on_delete=models.CASCADE
)
user = models.ForeignKey(
User,
on_delete=models.CASCADE
)
uuid = models.UUIDField(
default=uuid.uuid4,
editable=False,
unique=True
)
class Stamp(models.Model):
stampcardformat = models.ForeignKey(
Stampcardformat,
on_delete=models.CASCADE
)
stampcard = models.ForeignKey(
Stampcard,
on_delete=models.CASCADE,
blank=True,
null=True
)
uuid = models.UUIDField(
default=uuid.uuid4,
editable=False,
unique=True
)
These models describe a simple stampcard model. A stampcard is considered
full, when it has as many stamps via foreignkey associated to it as it's
stampcardformat's limit number dictates.
I need to write view that does the following:
1. The view takes in a list of stamps (see below) consisting of their
uuid's.
2. It then needs to find the right stampcardformat for each given stamp.
3. Next it needs to *check, whether the requests user has a stampcard
with the corresponding stampcardformat*.
a) *If it has* it needs to check, *if the stampcard is full or not.*
i) *If it is full*, it needs to create a new stampcard of the given
format and update the stamps stampcard-foreignkey to the created stampcard.
ii) *If it isn't full* t needs update the stamps stampcard-foreignkey to
the found stampcard
b) *If the user hasn't got a stampcard* of the given stampcardformat, it
needs to create a new stampcard and update the stamps stampcard-foreignkey
to the created stampcard.
This is probably a easy question for a real Django Pro, but for me it feels
like a impossible challenge. The class based views don't seem to support
this behaviour. I tried modifying the class based views, to no avail. I
fail besides many points, because the view throws the error:
AssertionError: Expected view StampUpdate to be called with a URL keyword
argument named "pk". Fix your URL conf, or set the `.lookup_field`
attribute on the view correctly.
Any help would be much appreciated!
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