我是django的新手，我正在尝试建立一些一对多关系。在我的项目中，我有以下模型：
class Order(models.Model):
customer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='customer')
retailer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='retailer')
date_publish = models.DateField()
date_available = models.DateField()
weight = models.DecimalField(decimal_places=2, max_digits=5)
class orderTimelocation(models.Model):
order = models.ForeignKey(Order, on_delete=models.CASCADE, related_name='order_timelocation'),
longitude = models.DecimalField(decimal_places=8, max_digits=12)
latitude = models.DecimalField(decimal_places=8, max_digits=12)
class timeInterval(models.Model):
start = models.DateTimeField()
end = models.DateTimeField()
order_timelocation = models.ForeignKey(orderTimelocation, related_name='time_interval', on_delete=models.CASCADE)
和以下串行器：
class OrderSerializer(serializers.ModelSerializer):
orderTimeLocations = orderTimelocationSerializer(many=True)
class Meta:
model = Order
fields = ['customer', 'retailer', 'date_publish', 'date_available', 'weight', 'orderTimeLocations']
class orderTimelocationSerializer(serializers.ModelSerializer):
timeintervals = timeIntervalSerializer(many= True)
class Meta:
model = order_timelocation
fields = ('longitude', 'latitude', 'timeintervals')
class timeIntervalSerializer(serializers.ModelSerializer):
class Meta:
model = time_interval
fields = ['start', 'end']
我试图遵循django-rest框架文档中关于嵌套关系主题的示例，我认为这是最适合这种情况的，但出现了以下错误
Traceback (most recent call last):
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/django/core/handlers/base.py", line 181, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/django/views/generic/base.py", line 70, in view
return self.dispatch(request, *args, **kwargs)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/views.py", line 509, in dispatch
response = self.handle_exception(exc)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/views.py", line 469, in handle_exception
self.raise_uncaught_exception(exc)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
raise exc
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/views.py", line 506, in dispatch
response = handler(request, *args, **kwargs)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/generics.py", line 190, in post
return self.create(request, *args, **kwargs)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/mixins.py", line 18, in create
serializer.is_valid(raise_exception=True)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 220, in is_valid
self._validated_data = self.run_validation(self.initial_data)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 419, in run_validation
value = self.to_internal_value(data)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 476, in to_internal_value
validated_value = field.run_validation(primitive_value)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 607, in run_validation
value = self.to_internal_value(data)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 643, in to_internal_value
validated = self.child.run_validation(item)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 419, in run_validation
value = self.to_internal_value(data)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 472, in to_internal_value
for field in fields:
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 355, in _writable_fields
for field in self.fields.values():
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 349, in fields
for key, value in self.get_fields().items():
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/serializers.py", line 1028, in get_fields
info = model_meta.get_field_info(model)
File "/home/miguel/workspace/projeto-final/backend/env/lib/python3.8/site-packages/rest_framework/utils/model_meta.py", line 35, in get_field_info
opts = model._meta.concrete_model._meta
AttributeError: module 'delivery.models.order_timelocation' has no attribute '_meta'
我在这里看到了几个问题，但这些问题的答案都不能解决我的问题。
作为模型，您应该使用OrderTimeLocation:
from delivery.models importOrderTimeLocation
class orderTimelocationSerializer(serializers.ModelSerializer):
timeintervals = timeIntervalSerializer(many= True)
class Meta:
model =OrderTimeLocation
fields = ('longitude', 'latitude', 'timeintervals')在您的模型中，order_timelocation是ForeignKey，因此它应该缩进到模型的类的范围中。