我的类型为datetime的模型中有一个“时间戳”列。我想按时间戳的降序对queryset进行排序。
OHLCV.objects.all().order_by('-timestamp')
TypeError：参数必须为int或float
如何调试此问题？谢谢！
PS：我正在使用DRF，无法在序列化器或视图中订购它（使用django-filter）
编辑：从Django shell追溯
In [74]: OHLCV.objects.all()
Out[74]: <QuerySet [<OHLCV: OHLCV object (5fa8629c-622b-4ab5-9920-615c979c431f)>, <OHLCV: OHLCV object (f0f7dd7e-705
e-428e-b01d-26c5b554b2fd)>, <OHLCV: OHLCV object (ab72a3c5-8df5-4136-8a90-19e91bbae709)>, <OHLCV: OHLCV object (d257
9688-7da0-46b7-9ad3-ddcfaeb2532f)>, <OHLCV: OHLCV object (8e3a0875-14df-4718-b416-40a9bf5444c9)>, <OHLCV: OHLCV obje
ct (2ff52da7-72e1-4a23-895e-1209da5e4863)>, <OHLCV: OHLCV object (84c8a1c3-96de-4da2-90fc-f22cb47c8fca)>, <OHLCV: OH
LCV object (4cf34289-4ca9-41bb-a6c2-b9d86bd28a02)>, <OHLCV: OHLCV object (0c8c4698-2b95-402f-b18b-e96abba7e679)>, <O
HLCV: OHLCV object (9f906cfa-e0ac-44e6-a996-b3c1982d7256)>, <OHLCV: OHLCV object (2e8c2e1b-b2d9-4775-b933-632a25682a
ee)>, <OHLCV: OHLCV object (37e09dbc-3f35-40eb-aa6c-da26d4d272be)>, <OHLCV: OHLCV object (d5fad8bd-bc54-4d15-8ca4-f2
ce74c76025)>, <OHLCV: OHLCV object (bbaf88a8-41e5-44f5-afa0-0956c639b0eb)>, <OHLCV: OHLCV object (50f8459a-1c94-47b3
-817f-b5fbb155f1f4)>, <OHLCV: OHLCV object (6bea514d-2e95-4fa1-b4c2-e782edde8b1b)>, <OHLCV: OHLCV object (37ffe519-1
c70-4431-bdb5-baec34832ca8)>, <OHLCV: OHLCV object (123b3f40-8a52-43f7-9297-f5170a48bc91)>, <OHLCV: OHLCV object (94
ac0309-c741-46cc-8ec2-646dd9db4848)>, <OHLCV: OHLCV object (614eaacf-3797-40e2-9a86-e620fd02ba73)>, '...(remaining e
lements truncated)...']>
In [75]: OHLCV.objects.all()[0].timestamp
Out[75]: datetime.datetime(2019, 3, 13, 9, 30, tzinfo=<UTC>)
In [76]: OHLCV.objects.all().order_by('-timestamp')
Out[76]: ---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
~/miniconda3/lib/python3.6/site-packages/IPython/core/formatters.py in __call__(self, obj)
700 type_pprinters=self.type_printers,
701 deferred_pprinters=self.deferred_printers)
--> 702 printer.pretty(obj)
703 printer.flush()
704 return stream.getvalue()
~/miniconda3/lib/python3.6/site-packages/IPython/lib/pretty.py in pretty(self, obj)
400 if cls is not object \
401 and callable(cls.__dict__.get('__repr__')):
--> 402 return _repr_pprint(obj, self, cycle)
403
404 return _default_pprint(obj, self, cycle)
~/miniconda3/lib/python3.6/site-packages/IPython/lib/pretty.py in _repr_pprint(obj, p, cycle)
695 """A pprint that just redirects to the normal repr function."""
696 # Find newlines and replace them with p.break_()
--> 697 output = repr(obj)
698 for idx,output_line in enumerate(output.splitlines()):
699 if idx:
~/miniconda3/lib/python3.6/site-packages/django/db/models/query.py in __repr__(self)
242
243 def __repr__(self):
--> 244 data = list(self[:REPR_OUTPUT_SIZE + 1])
245 if len(data) > REPR_OUTPUT_SIZE:
246 data[-1] = "...(remaining elements truncated)..."
~/miniconda3/lib/python3.6/site-packages/django/db/models/query.py in __iter__(self)
266 - Responsible for turning the rows into model objects.
267 """
--> 268 self._fetch_all()
269 return iter(self._result_cache)
270
~/miniconda3/lib/python3.6/site-packages/django/db/models/query.py in _fetch_all(self)
1184 def _fetch_all(self):
1185 if self._result_cache is None:
-> 1186 self._result_cache = list(self._iterable_class(self))
1187 if self._prefetch_related_lookups and not self._prefetch_done:
1188 self._prefetch_related_objects()
~/miniconda3/lib/python3.6/site-packages/django/db/models/sql/compiler.py in apply_converters(self, rows, converters
)
1007 value = row[pos]
1008 for converter in convs:
-> 1009 value = converter(value, expression, connection)
1010 row[pos] = value
1011 yield row
~/miniconda3/lib/python3.6/site-packages/django/db/backends/sqlite3/operations.py in converter(value, expression, co
nnection)
252 def converter(value, expression, connection):
253 if value is not None:
--> 254 return create_decimal(value).quantize(quantize_value, context=expression.output_field.co
ntext)
255 else:
256 def converter(value, expression, connection):
TypeError: argument must be int of float
In [77]: import django
In [78]: django.__version__
Out[78]: '2.1.5'
型号
class OHLCV(models.Model):
# General
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
createdAt = models.DateTimeField(auto_now_add=True)
updatedAt = models.DateTimeField(auto_now=True)
# OHLCV
ticker = models.CharField(max_length=20)
timestamp = models.DateTimeField()
open = models.DecimalField(max_digits=15, decimal_places=2)
high = models.DecimalField(max_digits=15, decimal_places=2)
low = models.DecimalField(max_digits=15, decimal_places=2)
close = models.DecimalField(max_digits=15, decimal_places=2)
volume = models.IntegerField(default=0)
class Meta:
unique_together = (("ticker", "timestamp",),)
序列化器
class OHLCVSerializer(serializers.ModelSerializer):
class Meta:
model = OHLCV
exclude = ('id', 'createdAt', 'updatedAt',)
查看
class OHLCVView(generics.ListAPIView):
queryset = OHLCV.objects.all()
serializer_class = OHLCVSerializer
permission_classes = (IsAuthenticated,)
name = 'OHLCV'
search_fields = (
'^ticker',
)
ordering = (
'timestamp',
)