testing an idea

fkreplace/__init__.py

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+# thanks to https://djangosnippets.org/snippets/2283/ for inspiration on m2m
+
+def migrate(from_obj, to_obj):
+    for related in from_obj._meta.get_all_related_objects():
+        accessor_name = related.get_accessor_name()
+        varname = related.field.name
+        getattr(from_obj, accessor_name).all().update(**{varname: to_obj})
+
+    for related_m2m in from_obj._meta.get_all_related_many_to_many_objects():
+        accessor_name = related.get_accessor_name()
+        varname = related.field.name
+
+        #for obj in getattr(from_obj, varname)
+

runtests.py

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+#!/usr/bin/env python
+import os
+import sys
+
+import django
+from django.conf import settings
+from django.test.utils import get_runner
+
+if __name__ == "__main__":
+    os.environ['DJANGO_SETTINGS_MODULE'] = 'tests.settings'
+    django.setup()
+    TestRunner = get_runner(settings)
+    test_runner = TestRunner()
+    failures = test_runner.run_tests(["tests"])
+    sys.exit(bool(failures))

tests/models.py

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+from django.db import models
+
+
+class Person(models.Model):
+    name = models.CharField(max_length=100)
+    friends = models.ManyToManyField('self')
+
+
+class Number(models.Model):
+    person = models.ForeignKey(Person, related_name='numbers')
+    number = models.CharField(max_length=10)
+
+
+class SSN(models.Model):
+    person = models.OneToOneField(Person)
+    number = models.CharField(max_length=10)
+
+
+class Group(models.Model):
+    name = models.CharField(max_length=100)
+    people = models.ManyToManyField(Person)

tests/settings.py

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+SECRET_KEY = 'so-secret'
+
+INSTALLED_APPS = (
+    'fkreplace',
+)
+
+MIDDLEWARE_CLASSES = ()
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': 'db.sqlite3',
+    }
+}
+

tests/tests.py

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+from django.test import TestCase
+from .models import Person, Number, SSN
+
+def setUp():
+    a = Person.objects.create(name='alf')
+    b = Person.objects.create(name='bee')
+    Number.objects.create(person=a, number='123')
+    Number.objects.create(person=a, number='1234')