def retrieve_objects(self, model_object):
"""Retrieve the objects of the many part.
A Mayn2One relation uses the repository manager to retrieve
a list of objects.
"""
from model.functions import get_pkey_values
value = get_pkey_values(model_object)
if len(value) == 1:
value = value[0]
field = self.inverse.related_field
repository = self.inverse.model._repository
repository_manager = repository.data_connector.repository_manager
return repository_manager.find_matching_objects(field, value)
def set_related(self, obj, new_obj):
"""Set the related field.
The value should be a model object.
"""
from model.functions import get_pkey_values
attribute_name = self.attribute_name
model = self.foreign_model
if new_obj is None:
new_value = None
else:
if not isinstance(new_obj, model):
raise ValueError("try to affect {} to the {}.{} model " \
"field".format(new_obj, self.model, self.field_name))
values = get_pkey_values(new_obj)
if len(values) == 1:
values = values[0]
new_value = values
setattr(obj, attribute_name, new_value)