Django属性错误'；datetime.timedelta'；对象没有属性'；解码'；

我使用的是django rest框架的一个简单通用视图，该视图在本地机器上运行良好，但在服务器上给出了一个属性错误。这就是错误：

AttributeError at /api/getcarts/ 'datetime.timedelta' object has no attribute 'decode'

下面是课堂：

class GetCarts(generics.ListAPIView):
     serializer_class = CartSerializer
     queryset = TblCarts.objects.all()

奇怪的是，所有其他GET和POST API都工作正常。以下是TblCart：

class TblCarts(models.Model):
     price = models.IntegerField()
     location = models.CharField(max_length=500)
     location_coordinate = models.CharField(max_length=100, default=0)
     number = models.CharField(max_length=50)
     promo_code = models.CharField(max_length=50, default=0)
     receipt = models.CharField(max_length=100)
     order_receive_date = models.DateField(auto_now_add=True)
     order_receive_time = models.TimeField(auto_now_add=True)
     order_dispatch_time = models.TimeField(default='00:00', max_length=100)
     order_delivered_time = models.TimeField(default='00:00', max_length=100)
     order_status = models.CharField(max_length=100, default=1)

    class Meta:
         managed = False
         db_table = 'tbl_carts'

以下是序列化程序：

class CartSerializer(serializers.ModelSerializer):
    class Meta:
         model = TblCarts
         fields = '__all__'

我想不出是什么问题。这些版本是：python 3.6.5、Django 2.1、djangorestframework 3.8.2

错误回溯：

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  126.                 response = self.process_exception_by_middleware(e, request)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  124.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/views/decorators/csrf.py" in wrapped_view
  54.         return view_func(*args, **kwargs)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/views/generic/base.py" in view
  68.             return self.dispatch(request, *args, **kwargs)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/rest_framework/views.py" in dispatch
  483.             response = self.handle_exception(exc)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/rest_framework/views.py" in handle_exception
  443.             self.raise_uncaught_exception(exc)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/rest_framework/views.py" in dispatch
  480.             response = handler(request, *args, **kwargs)

File "/var/www/khaanpin/khanpinuser/api/views.py" in get
  51.         return Response({'error': 'false', 'data': CartSerializer(orders, many=True).data})

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/rest_framework/serializers.py" in data
  765.         ret = super(ListSerializer, self).data

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/rest_framework/serializers.py" in data
  262.                 self._data = self.to_representation(self.instance)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/rest_framework/serializers.py" in to_representation
  683.             self.child.to_representation(item) for item in iterable

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/db/models/query.py" in __iter__
  268.         self._fetch_all()

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/db/models/query.py" in _fetch_all
  1183.             self._result_cache = list(self._iterable_class(self))

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/db/models/query.py" in __iter__
  63.         for row in compiler.results_iter(results):

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/db/models/sql/compiler.py" in cursor_iter
  1462.         for rows in iter((lambda: cursor.fetchmany(itersize)), sentinel):

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/db/models/sql/compiler.py" in <lambda>
  1462.         for rows in iter((lambda: cursor.fetchmany(itersize)), sentinel):

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/db/utils.py" in inner
  96.                 return func(*args, **kwargs)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/mysql/connector/cursor_cext.py" in fetchmany
  510.             rows.extend(self._cnx.get_rows(size)[0])

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/mysql/connector/connection_cext.py" in get_rows
  280.                                                               row[i])

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/mysql/connector/conversion.py" in to_python
  205.             return self._cache_field_types[vtype[1]](value, vtype)

File "/var/www/khaanpin/khanpinuser/venv3/lib/python3.6/site-packages/mysql/connector/django/base.py" in _TIME_to_python
  106.         return dateparse.parse_time(value.decode('utf-8'))

Exception Type: AttributeError at /api/getcarts/
Exception Value: 'datetime.timedelta' object has no attribute 'decode'
Request information:
USER: 9999999999

GET: No GET data

POST: No POST data

FILES: No FILES data

COOKIES: No cookie data

File”/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/django/core/handlers/exception.py
34响应=获取响应（请求）
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/core/handlers/base.py”中的
126response=self.process\u异常\u由\u中间件（e，请求）
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site-packages/django/core/handlers/base.py”中的
124响应=包装的回调（请求，*回调参数，**回调参数）
包装视图中的文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/django/views/decorators/csrf.py”
54返回视图函数（*args，**kwargs）
视图中的文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/django/views/generic/base.py”
68返回自调度（请求，*args，**kwargs）
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/rest\u framework/views.py”已发送
483响应=自身处理异常（exc）
句柄异常中的文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/rest\u framework/views.py”
443自举未捕获异常（exc）
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/rest\u framework/views.py”已发送
480响应=处理程序（请求、*args、**kwargs）
get中的文件“/var/www/khanpin/khanpinuser/api/views.py”
51返回响应（{'error'：'false'，'data'：CartSerializer（orders，many=True）.data}）
数据中的文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/rest\u framework/serializers.py”
765ret=super（ListSerializer，self）.data
数据中的文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/rest\u framework/serializers.py”
262self.\u data=self.to\u表示（self.instance）
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/rest\u framework/serializers.py”在to\u表示中
683iterable中项的self.child.to_表示（项）
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/django/db/models/query.py”__
268self._fetch_all（）
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/django/db/models/query.py”
1183self.\u result\u cache=list（self.\u iterable\u class（self））
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/django/db/models/query.py”__
63对于编译器中的行。结果\u iter（结果）：
游标编辑器中的文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/django/db/models/sql/compiler.py”
1462对于iter中的行（（lambda:cursor.fetchmany（itersize）），sentinel）：
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/django/db/models/sql/compiler.py”
1462对于iter中的行（（lambda:cursor.fetchmany（itersize）），sentinel）：
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/django/db/utils.py”，位于内部
96返回函数（*args，**kwargs）
fetchmany中的文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/mysql/connector/cursor_cext.py”
510rows.extend（self.\u cnx.get\u rows（size）[0]）
get_行中的文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/mysql/connector/connection_cext.py”
280第[i]行）
文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site-packages/mysql/connector/conversion.py”到python
205返回self.\u缓存\u字段\u类型[vtype[1]]（值，vtype）
python中的文件“/var/www/khanpin/khanpinuser/venv3/lib/python3.6/site packages/mysql/connector/django/base.py”
106return dateparse.parse_time（value.decode（'utf-8'））
异常类型：AttributeError at/api/getcarts/
异常值：“datetime.timedelta”对象没有“decode”属性
请求信息：
用户：99999999
获取：不获取数据
POST：无POST数据
文件：没有文件和数据
COOKIES：没有cookie数据

不要使用：

 order_dispatch_time = models.TimeField(default='00:00', max_length=100)
 order_delivered_time = models.TimeField(default='00:00', max_length=100)

而是使用：

 import datetime
  <...you model ...>
 order_dispatch_time = models.TimeField(default=datetime.time(00,00))
 order_delivered_time = models.TimeField(default=datetime.time(00,00))

导入日期时间
订单调度时间=models.TimeField（默认值=datetime.time（00,00））
订单交付时间=models.TimeField（默认值=datetime.time（00,00））

问题似乎与您正在使用的数据库连接器有关

我解决这个问题的方法是在连接数据库时使用

mysql-connector-c

而不是

mysql-client

我曾经解决过我的问题，但最后还有另一个选择

步骤是：

pip安装mysql连接器python

pip安装mysqlclient

更改我的设置文件中的数据库设置（在我的示例中为base.py）

• 来自

  “default”：env.db（'db_default'，default=f'mysql-connector://root:password@{HOST_MYSQL}:3306/YOUR_DB'）

• 默认值：env.db（'db_default'，default=f'mysql://root:password@{HOST_MYSQL}:3306/YOUR_DB'）

另一个选项是将

use\u pure

从db选项更改为

true

，您可以通过向连接URL添加

？use\u pure=true

查询字符串来完成此操作

最后一个可能会影响连接性能，因为它确保使用Python的纯co