I'm using Django 1.6 RC1 and Python 3.3 with the following models:
class StepBlueprint(models.Model):
parents = models.ManyToManyField('self', blank=True, null=True,
related_name='children')
name = models.CharField( max_length=100 )
def __str__(self):
return self.name
class FlowBlueprint(StepBlueprint):
description = models.TextField()
def get_children(self):
print("DEBUG: processing ({0})".format(self))
print(dir(self))
# why isn't this working?? this is what related_name is supposed
to provide
return self.children
When I call get_children() here, I get the following:
DEBUG: processing (Prodigal)
['DoesNotExist', 'MultipleObjectsReturned', 'TYPES', '__class__',
'__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__',
'__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__',
'__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__',
'__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__',
'__weakref__', '_base_manager', '_default_manager', '_deferred',
'_do_insert', '_do_update', '_get_FIELD_display',
'_get_next_or_previous_by_FIELD', '_get_next_or_previous_in_order',
'_get_pk_val', '_get_unique_checks', '_meta', '_perform_date_checks',
'_perform_unique_checks', '_save_parents', '_save_table', '_set_pk_val',
'_state', 'build', 'clean', 'clean_fields', 'commandblueprint',
'conditional_code', 'date_error_message', 'delete', 'description',
'flow_set', 'flowblueprint', 'full_clean', 'get_children', 'get_command',
'get_type_display', 'id', 'name', 'objects', 'parents', 'pk',
'prepare_database_save', 'save', 'save_base', 'serializable_value',
'standalonetool_set', 'stepblueprint_ptr', 'stepblueprint_ptr_id', 'type',
'unique_error_message', 'validate_unique']
Traceback (most recent call last):
[ call stack ... ]
return self.children
AttributeError: 'FlowBlueprint' object has no attribute 'children'
What am I doing wrong here? From within the FlowBlueprint object I want to
be able to get the backwards relation of all those objects pointing to it,
and it seems like related_name is supposed to provide that. Its value
doesn't show up in the dir() output.
Any help would be greatly appreciated.
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