Hi,
I ran in to the situation of wanting `to_python` and `to_url` be decorated
with `@classmethod` to avoid having to declare an additional (kind of
no-op) class with those 2 methods.
Given that I have a couple of custom python data structures that can be
encoded into path params, it would be slightly more cleaner if my custom
class(es) would be the ones declaring `def to_python` and `def to_url` to
comply with the path converter interface. Rather than having some
additional `class <MyType>Converter`.
Below follows an invented example, where I pretend to have some product
slug composed of a slugged name and integer code. Imagine seeing something
like “white-socks-123456789” in a URL.
```
class Slug:
regex = r".+"
def __init__(self, slugged_name, sku):
self.slugged_name = slugged_name
self.sku = sku
@classmethod
def to_python(cls, value):
name, _, sku = value.rpartition("-")
if not name:
raise ValueError("invalid name segment")
try:
sku = int(sku)
except ValueError as exc:
raise ValueError("sku needs to be a number") from exc
return cls(name, sku)
@classmethod
def to_url(cls, slug):
return f"{slug.slugged_name}-{slug.sku}"
register_converter(Slug, "my-slug")
```
Could changing the converter interface be something to consider?
At least I couldn’t see any obvious problems with expecting these 2 methods
as `@classmethod` (or even `@staticmethod`?) instead. But I could very well
be missing something.
Thanks!
Petter
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