所以我有这个模型：
class CdrSheet(models.Model):
MONTH_CHOICES = ((1, "January"), (2, "February"), (3, "March"), (4, "April"), (5, "May"), (6, "June"), (7, "July"),
(8, "August"), (9, "September"), (10, "October"), (11, "November"), (12, "December"))
uploaded = models.DateTimeField(auto_now_add=True, blank=False)
title = models.CharField(max_length=100, blank=True)
slug = models.SlugField(unique=True)
report_year = models.IntegerField(default=datetime.datetime.now().year, blank=False, help_text="Requi"
"red")
report_month = models.IntegerField(choices=MONTH_CHOICES, default=1, blank=False, help_text="Required")
file = models.FileField(max_length=None, blank=False, upload_to=file_name, help_text="CSV files only")
carrier = models.CharField(max_length=100, blank=False, help_text="Required")
ani_field = models.CharField(max_length=20, default="ani", blank=True, help_text="Default: 'ani'")
ani_country_code = models.CharField(max_length=2, default="", blank=True, help_text="If blank, script will assume "
"numbers are internationally "
"formatted")
dest_field = models.CharField(max_length=20, default="dest", blank=True, help_text="Default: 'dest'")
dest_country_code = models.CharField(max_length=2, default="", blank=True, help_text="If blank, script will assume "
"numbers are internationally "
"formatted")
duration_field = models.CharField(max_length=20, blank=True, default="duration", help_text="Default: 'duration'")
cost_field = models.CharField(max_length=20, blank=True, default="cost", help_text="Default: 'cost'")
date_field = models.CharField(max_length=20, blank=True, default="date", help_text="Default: 'date'")
date_format = models.CharField(max_length=20, blank=True, default="%m/%d/%Y", help_text="Please use format "
"specifications shown at "
"http://strftime.org. "
"Default: '%m/%d/%Y'")
time_field = models.CharField(max_length=20, blank=True, default="time", help_text="Default: 'time'")
time_format = models.CharField(max_length=20, blank=True, default="%H:%M:%S", help_text="Please use format "
"specifications shown at "
"http://strftime.org. "
"Default: '%H:%M:%S'")
class Meta:
ordering = ('uploaded',)
我有这个应该工作的序列化器：
class CdrSheetSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = CdrSheet
fields = ('pk', 'uploaded', 'title', 'report_year', 'report_month', 'file', 'carrier', 'ani_field',
'ani_country_code', 'dest_field', 'dest_country_code', 'duration_field', 'cost_field', 'date_field',
'date_format', 'time_field', 'time_format', 'slug')
read_only_fields = ('pk', 'uploaded', 'slug')
但是，当我尝试在django rest框架中创建对象时，会在rest_framework中的某处抛出一个TypeError，给我这个：
在致电
TypeError时获得CdrSheet.objects.create()。这可能是因为序列化程序类上的可写字段不是CdrSheet.objects.create()的有效参数。您可能需要将该字段设置为只读，或覆盖CdrSheetSerializer.create（）方法以正确处理此字段。 原始异常文本是：deserialize（）只需要2个参数（给定1个）。
我对这个神秘的反序列化方法的定义和使用方式感到非常困惑。我找不到任何地方。它是在django源代码中吗？它是在rest-framework代码中，它是一个普通的python方法吗？我不明白为什么它给了我这个错误。任何帮助将不胜感激。
P.S。我确实覆盖了CdrSheet模型的save方法，但它非常大，我不想因为代码量而把所有人都拒之门外。再次感谢！
以下是完整的追溯，请求：
Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/csrf.py" in wrapped_view
58. return view_func(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/viewsets.py" in view
85. return self.dispatch(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/views.py" in dispatch
456. response = self.handle_exception(exc)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/views.py" in dispatch
453. response = handler(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/mixins.py" in create
20. self.perform_create(serializer)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/mixins.py" in perform_create
25. serializer.save()
File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in save
169. self.instance = self.create(validated_data)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in create
798. raise TypeError(msg)
Exception Type: TypeError at /cdrs/
Exception Value: Got a `TypeError` when calling `CdrSheet.objects.create()`. This may be because you have a writable field on the serializer class that is not a valid argument to `CdrSheet.objects.create()`. You may need to make the field read-only, or override the CdrSheetSerializer.create() method to handle this correctly.
Original exception text was: deserialize() takes exactly 2 arguments (1 given).
这是我的重叠保存方法。它不是那么大，我只是觉得它可能很烦人。所以这就是：
def save(self, *args, **kwargs):
# Override the save function
columns = {}
columns['ANI'] = self.ani_field if self.ani_field else 'ani'
columns['DEST'] = self.dest_field if self.dest_field else 'dest'
columns['DURATION'] = self.duration_field if self.duration_field else 'duration'
columns['COST'] = self.cost_field if self.cost_field else 'cost'
columns['DATE'] = self.date_field if self.date_field else 'date'
columns['TIME'] = self.time_field if self.time_field else 'time'
if not self.pk:
title = self.title
self.slug = unique_slugify(title if title else "{0} cdr from {1}{2:02d}"
.format(self.file.name, self.report_year,
self.report_month), self._meta.get_field('slug').max_length, CdrSheet)
super(CdrSheet, self).save(*args, **kwargs)
def parse_row(row):
date_format = self.date_format if self.date_format else '%m/%d/%Y'
time_format = self.time_format if self.time_format else '%H:%M:%S'
Cdr.create(report=self.pk,
report_datetime="{}{}".format(self.report_year, self.report_month),
datetime=datetime.datetime.strptime("{} {}".format(row[columns['DATE']], row[columns['TIME']]),
"{} {}".format(date_format, time_format)),
ani="{}{}".format(self.ani_country_code, row[columns['ANI']]),
dest="{}{}".format(self.dest_country_code, row[columns['DEST']]),
duration=row[columns['DURATION']],
cost=row[columns['COST']])
filename = self.file.path
cdr_path = os.path.abspath(filename)
with open(cdr_path) as csvfile:
reader = csv.DictReader(csvfile)
for row in reader:
parse_row(row)
这是我在models.py文件顶部的方法：
@receiver(pre_delete)
def delete_catcher(sender, instance, **kwargs):
if sender == CdrSheet:
cdrs = Cdr.objects.filter(report=instance.pk)
for cdr in cdrs:
cdr.delete()
def file_name(instance, filename):
# To get the filename/path for the uploaded csv file
return '/'.join([str(instance.report_year) + '{0:02d}'.format(instance.report_month), instance.title +
os.path.splitext(filename)[1]])
def unique_slugify(string, max_length, obj):
slug = slugify(string)
for x in itertools.count(1):
if not obj.objects.filter(slug=slug).exists():
break
slug = "{}-{}".format(slug[:max_length - len(str(x)) - 1], x)
return slug
我想我找到了错误的来源。调用CdrSheet.objects.create(**validate_data)提出了这个追溯：
Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/csrf.py" in wrapped_view
58. return view_func(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/viewsets.py" in view
85. return self.dispatch(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/views.py" in dispatch
456. response = self.handle_exception(exc)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/views.py" in dispatch
453. response = handler(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/mixins.py" in create
20. self.perform_create(serializer)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/mixins.py" in perform_create
25. serializer.save()
File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in save
169. self.instance = self.create(validated_data)
File "/home/supereman16/PerfectPitchTech/projects/processor_api/sheets/serializers.py" in create
14. return CdrSheet.objects.create(**validated_data)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py" in manager_method
127. return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py" in create
348. obj.save(force_insert=True, using=self.db)
File "/home/supereman16/PerfectPitchTech/projects/processor_api/sheets/models.py" in save
110. parse_row(row)
File "/home/supereman16/PerfectPitchTech/projects/processor_api/sheets/models.py" in parse_row
102. cost=row[columns['COST']])
File "/usr/local/lib/python2.7/dist-packages/cassandra/cqlengine/models.py" in create
603. return cls.objects.create(**kwargs)
File "/usr/local/lib/python2.7/dist-packages/cassandra/cqlengine/query.py" in create
713. return self.model(**kwargs).batch(self._batch).ttl(self._ttl).\
File "/usr/local/lib/python2.7/dist-packages/cassandra/cqlengine/models.py" in __init__
365. value = column.to_python(value)
File "/usr/local/lib/python2.7/dist-packages/cassandra/cqlengine/columns.py" in to_python
491. return datetime.utcfromtimestamp(DateType.deserialize(value)).date()
Exception Type: TypeError at /cdrs/
Exception Value: deserialize() takes exactly 2 arguments (1 given)
答案 0 :(得分：0)
我修好了。这恰好是我的cqlengine模型的问题，以及我试图添加到它的内容。我的模型看起来像这样：
# ...
report_datetime = columns.Date(required=True, primary_key=True)
datetime = columns.DateTime(required=True)
# ...
这些是我的创建调用的参数：
Cdr.create( # ... First few args
report_datetime="{}{}".format(self.report_year, self.report_month),
datetime=datetime.datetime.strptime("{} {}".format(row[columns['DATE']], row[columns['TIME']]),
"{} {}".format(date_format, time_format)),
# ... Last few args )
我试图将日期字段设置为文本值，并抱怨。谢谢一群人！