#27910: Use Enum class in model choices
-------------------------------------+-------------------------------------
Reporter: Marcel | Owner: nobody
Hellwig |
Type: New | Status: new
feature |
Component: Database | Version: 1.10
layer (models, ORM) |
Severity: Normal | Keywords: enum model choices
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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I will simply stick to your example here:
https://docs.djangoproject.com/en/dev/ref/models/fields/#choices
I want to limit the input to certain choices so I create a list/tuple of
tuples/lists. Since Python 3.4 there is a class called
[https://docs.python.org/3.5/library/enum.html Enum] and some nice
decorators like [https://docs.python.org/3.5/library/enum.html#ensuring-
unique-enumeration-values @unique].
Currently, if you want to use this you have to do 1/2 dirty hacks,
descriped in [http://blog.richard.do/index.php/2014/02/how-to-use-enums-
for-django-field-choices/ this article], which I would prefer over the
current solution.
It would be nice to have native support for the Enum class, e.g. you can
directly pass the class to choices (instead of using the class method
choices() ), also when refering to an element in the enum just using
{{{Student.Freshmann}}} instead of {{{Student.Freshmann.value}}}
A simple example would be this:
{{{
from enum import Enum
class Student(models.Model):
class YearInSchoolChoices(Enum):
Freshman = 'FR'
Sophomore = 'SO'
Junior = 'JR'
Senior = 'SR'
year_in_school = models.CharField(
max_length=2,
choices=YearInSchoolChoices,
default=YearInSchoolChoices.Freshman,
)
def is_upperclass(self):
return self.year_in_school in (self.YearInSchoolChoices.Junior,
self.YearInSchoolChoices.Senior)
}}}
Also this could be adopted (if accepted) to any type of choices in django,
e.g. [https://docs.djangoproject.com/en/1.10/ref/forms/fields/#choicefield
Choicefield] etc.
--
Ticket URL: <https://code.djangoproject.com/ticket/27910>
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