[Django] #27910: Use Enum class in model choices

[Django]

#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          |
-------------------------------------+-------------------------------------
 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>
Django <https://code.djangoproject.com/>
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