django-percentagefield 0.1.5

A ``PercentageField`` for Django that shows a Decimal (ex. ``0.2100`` in the database - by default rounded to 4 decimal spaces) as a percentage in the admin (ex. ``21%``). With built-in (overridable) min and max validator to ensure a valid percentage range: 0 ≤ x ≤ 100.

Django Percentage Field

This package add a PercentageField to Django (also works with Unfold, some minor styling improvements needed) that shows a percentage in the admin as 21%, but stores it as a Decimal - 0.2100 - to the database. This makes it clearer for admins what the field represents, while the decimal value makes actual calculations easier.

Installation

Run pip install django-percentagefield (or poetry add django-percentagefield)

Settings

• add django_percentagefield to your INSTALLED_APPS before django.contrib.admin
• in your models.py, add the PercentageField as such:

from django.db import models

from django_percentagefield.db.models import PercentageField


class YourModel(models.Model):
    percentage_field = PercentageField()

• in your admin.py, add the following wherever you use PercentageField:

from django.contrib import admin
from django.utils.translation import gettext_lazy as _
from django_percentagefield.utils import format_percentage

from .models import YourModel


@admin.register(YourModel)
class YourModelAdmin(admin.ModelAdmin):
    list_display = ('formatted_percentage_field',)

    def formatted_percentage_field(self, instance: YourModel) -> str:
        return format_percentage(value=instance.percentage_field, include_percentage_symbol=True)

    formatted_percentage_field.short_description = _('PercentageField description')

• [optional]: add PERCENTAGE_MAX_DIGITS and PERCENTAGE_DECIMAL_PLACES to your settings.py (default values 7 and 4 respectively)

TODO: make the django-percentagefield package handle the formatting in list_display, readonly_fields, etc. automatically.