我试图用DRF构建一个django模型,它要么在创建后发送对象状态有效载荷,要么发送一个错误有效载荷。当我尝试执行类似操作时,会收到以下错误消息:
File "/Users/user/projects/bowling-game/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 527, in to_representation
ret[field.field_name] = field.to_representation(attribute)
File "/Users/user/projects/bowling-game/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 683, in to_representation
self.child.to_representation(item) for item in iterable
File "/Users/user/projects/bowling-game/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 683, in <listcomp>
self.child.to_representation(item) for item in iterable
File "/Users/user/projects/bowling-game/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 510, in to_representation
fields = self._readable_fields
File "/Users/user/projects/bowling-game/env/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/Users/user/projects/bowling-game/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 376, in _readable_fields
field for field in self.fields.values()
File "/Users/user/projects/bowling-game/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 363, in fields
for key, value in self.get_fields().items():
File "/Users/user/projects/bowling-game/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 997, in get_fields
serializer_class=self.__class__.__name__
AssertionError: Class ErrorSerializer missing "Meta" attribute
我的模型如下:
class BaseModel(models.Model, object):
# Encapsulates all error objects.
errors= []
def add_error(self, error_object):
"""appends the error to the list of errors."""
self.errors.append(error_object)
class Meta:
abstract = True
app_label = 'game'
class GameRegistration(BaseModel):
"""Instance of this class represents the user playing the bowling game."""
game_id = models.CharField(max_length=32,
help_text='Unique bowling game id', primary_key=True,
default=functools.partial(random_string, char_length=16))
# I will set the request.user to set the details later on, but not now.
user_name = models.CharField(help_text='unique username', default='test', max_length=32)
created_timestamp = models.DateTimeField(default=datetime.datetime.now)
class Meta:
indexes = [
models.Index(fields=['game_id'])
]
class Error(object):
"""
An instance of this class encapsulates the error code and the message to be
returned.
"""
def __init__(self, error_code, error_message):
self.error_code = error_code
self.error_message = error_message
def __repr__(self):
return '{}:{}'.format(self.__class__.__name__, self.__dict__)
我的序列化程序实现
^{pr2}$我想要一种在有效负载中序列化errors
json数组的方法。它不绑定到任何django模型。它封装了与其他django模型相关联的所有错误。其思想是,如果我能够创建GameRegistration
,那么我将返回以下有效负载
{
'game_id': 'ABCDabcd1234',
'created': '<created stamp>'
}
如果出现错误,我将按如下方式返回有效载荷:
{
'errors': {
'error_code': 500,
'error_message': 'Server error'
}
}
从
Serializer
类继承BaseSerializer
,而不是从ModelSerializer
继承。因此BaseSerializer
将类似于{{{cd7}与
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