Moving to Django 3.0's Field.choices Enumeration Types

Show & Tell
8

Unfortunately the Meta class can’t refer to the names in the outer class being defined:

In [11]: class MyChoices(Enum):
    ...:     WHATEVER = "1"
    ...:     SOMETHING = "2"
    ...:
    ...:     class Meta:
    ...:         SOME_GROUP = {WHATEVER, SOMETHING}
    ...:         GROUPING = [
    ...:              ['Something', [WHATEVER, SOMETHING]]
    ...:         ]
    ...:
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-11-3fe4f79f24e8> in <module>
...
<ipython-input-11-3fe4f79f24e8> in Meta()
      4
      5     class Meta:
----> 6         SOME_GROUP = {WHATEVER, SOMETHING}
      7         GROUPING = [
      8              ['Something', [WHATEVER, SOMETHING]]

NameError: name 'WHATEVER' is not defined

We could use strings to refer to them (SOME_GROUP = {'WHATEVER', 'SOMETHING'}) or special names in the main class. Given that enums already use some special names, and it’s cleaner syntax, I am in favour of the latter.