def new_id(cls):
id = tools.id_generator('A')
while len(cls.objects.filter(preamble_id=id)):
id = tools.id_generator('A')
return id
def new_id(cls):
id = tools.id_generator('V')
while len(cls.objects.filter(vertex_id=id)):
id = tools.id_generator('V')
return id
def new_id(cls):
id = tools.id_generator('E')
while len(cls.objects.filter(edge_id=id)):
id = tools.id_generator('E')
return id