Django Elegant Choices

Purpose

Django Elegant Choices is an utility for defining enumerations that can be used as choices in Django models.

Features

• defining symbolic name, database value and label of a choice in a single place
• storing extra metadata for a choice
• retrieving a choice by its symbolic name, database value or metadata entry value
• easy integration with Django by passing a choices class as the choices argument of a model field constructor

Concepts

We use a choices class as a namespace.

Database values of choices are currently integers.

Usage

The following code demonstrates how to use Choices in Django models.

# app/models.py
from django.db import models
from django.utils.translation import ugettext_lazy as _
from elegant_choices import Choice, Choices


class PersonStatusChoices(Choices):
    ACTIVE = Choice(1, _('active'), {'extra_field': 'a'})
    INACTIVE = Choice(2, _('inactive'), {'extra_field': 'i'})


class Person(models.Model):
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)
    status = models.PositiveSmallIntegerField(choices=PersonStatusChoices)


person = Person(first_name='John', last_name='Coder', status=PersonStatusChoices.ACTIVE)
print(person.status)  # prints 1
print(person.status.name)  # prints ACTIVE
print(person.status.label)  # prints active
print(person.status.meta['extra_field'])  # prints a

print(PersonStatusChoices.choices)  # prints [1, 2]
print([choice.name for choice in PersonStatusChoices.choices])  # prints ['ACTIVE', 'INACTIVE']
print(PersonStatusChoices.get_choice_by_meta_value('extra_field', 'i').name)  # prints INACTIVE
print(PersonStatusChoices.choices_by_value[2].name)  # prints INACTIVE

License

The Django Elegant Choices package is licensed under the MIT License.