Very practical for ORM experimenting or in the command shell
see https://stackoverflow.com/questions/1297873/how-do-i-write-a-single-file-django-application
Run
python minimum.py
with Django on the environment
Last active
September 1, 2017 19:30
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Minimum Django in one file
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| # This script is one of the smallest environments where Django models are | |
| # fully functional. | |
| # https://stackoverflow.com/questions/1297873/ | |
| # how-do-i-write-a-single-file-django-application | |
| import os | |
| import sys | |
| from datetime import datetime | |
| import django | |
| from django.apps import apps | |
| from django.apps.config import AppConfig | |
| from django.conf import settings | |
| from django.db import connections, models, DEFAULT_DB_ALIAS | |
| from django.db.models.base import ModelBase | |
| NAME = 'test' | |
| def main(): | |
| class MyModel(models.Model): | |
| applied_date = models.DateTimeField(null=True, blank=True) | |
| modified_date = models.DateTimeField(null=True, blank=True) | |
| @property | |
| def applied(self): | |
| if self.applied_date: | |
| return self.applied_date > self.modified_date | |
| return False | |
| @applied.setter | |
| def applied(self, value): | |
| if value: | |
| self.applied_date = datetime.now() | |
| else: | |
| self.modified_date = datetime.now() | |
| self.save() | |
| # SyncDB after model definition | |
| syncdb(MyModel) | |
| m = MyModel.objects.create(modified_date='2001-01-01') | |
| m.applied = True | |
| print MyModel.objects.count() | |
| print MyModel.objects.all()[0].applied_date | |
| assert MyModel.objects.all()[0].applied == True | |
| def setup(): | |
| with open(NAME + '.db', 'w'): | |
| pass | |
| settings.configure( | |
| DEBUG=True, | |
| DATABASES={ | |
| DEFAULT_DB_ALIAS: { | |
| 'ENGINE': 'django.db.backends.sqlite3', | |
| 'NAME': NAME + '.db'}},) | |
| app_config = AppConfig(NAME, sys.modules['__main__']) | |
| apps.populate([app_config]) | |
| django.setup() | |
| original_new_func = ModelBase.__new__ | |
| @staticmethod | |
| def patched_new(cls, name, bases, attrs): | |
| if 'Meta' not in attrs: | |
| class Meta: | |
| app_label = NAME | |
| attrs['Meta'] = Meta | |
| return original_new_func(cls, name, bases, attrs) | |
| ModelBase.__new__ = patched_new | |
| def syncdb(model): | |
| connection = connections[DEFAULT_DB_ALIAS] | |
| with connection.schema_editor() as editor: | |
| editor.create_model(model) | |
| def teardown(): | |
| os.remove(NAME + '.db') | |
| if __name__ == '__main__': | |
| setup() | |
| main() | |
| teardown() |
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