def master_model(options):
"""
The Master model class of this Model's Master/Detail relationship.
Accessible at ``<model_class>._meta.master_model``, the Master model class in a Master/Detail
relationship is the most generic non-abstract Model in this model's multiple-table chain
of inheritance.
If this model is not a detail model, None will be returned.
"""
# If this isn't even a MasterModel descendant, don't bother.
if not issubclass(options.model, MasterModel):
return None
try:
# The last item in this list is the oldest ancestor. Since the MasterModel usage
# is to declare your master by subclassing MasterModel, and MasterModel is abstract,
# the oldest ancestor model is the Master Model.
return options.get_parent_list()[-1]
except IndexError:
# Also None if this model is itself the master.
return None
def master_model(options):
"""
The Master model class of this Model's Master/Detail relationship.
Accessible at ``<model_class>._meta.master_model``, the Master model class in a Master/Detail
relationship is the most generic non-abstract Model in this model's multiple-table chain
of inheritance.
If this model is not a detail model, None will be returned.
"""
# If this isn't even a MasterModel descendant, don't bother.
if not issubclass(options.model, MasterModel):
return None
try:
# The last item in this list is the oldest ancestor. Since the MasterModel usage
# is to declare your master by subclassing MasterModel, and MasterModel is abstract,
# the oldest ancestor model is the Master Model.
return options.get_parent_list()[-1]
except IndexError:
# Also None if this model is itself the master.
return None
