id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 7623 Multi-table inheritance: Add the ability create child instance from existing parent brooks.travis@… "As it exists now, multi-table inheritance does not allow for the creation of a child model instance that inherits from an existing parent model instance. For example: Parent Class- {{{ class Place(models.Model): name = models.CharField(max_length=50) address = models.TextField(max_length=150) }}} Child Classes- {{{ class Restaurant(Place): place = models.OneToOneField(Place, parent_link=True) cuisine = models.CharField(max_length=75) rating = models.IntegerField() class Bar(Place): parent = models.OneToOneField(Place, parent_link=True) happy_hour = models.BooleanField() beers_on_tap = models.ManyToManyField(""Beers"", null=True, blank=True) }}} Sample Use-case- When the system is first deployed, a restaurant instance is created. Later, the restaurant adds a bar to increase revenue, and we now want to create a Bar model instance for the parent Place for the restaurant. I would propose the following interface for doing so: {{{ parentPlace = Restaurant.objects.get(name__iexact=""Bob's Place"").parent barInstance = Bar(parent=parentPlace, happy_hour=True) }}} However, if you attempt to create an instance in this manner now, you receive a DatabaseIntegrityError, saying that a Place object with that id already exists." New feature new Database layer (models, ORM) dev Normal model-inheritance, multi-table-inheritance brooks.travis@… sirexas@… anssi.kaariainen@… mike@… reza@… cmawebsite@… Aron Podrigal kamandol Carlos Palol Matias Rodal Bel-Shazzar InvalidInterrupt JM Barbier Charlie Denton Accepted 1 0 1 1 0 0