【发布时间】：2021-10-25 10:38:25
【问题描述】：
我对 graphene_django 有疑问。当我创建一个 DjangoObjectType 并将其传递给我的查询中的 DjangoFilterConnectionField 时，我得到一个 AssertionError 类型 {my DjangoObjectType class} 没有连接。
这是我的代码的一部分：
class TradeType(DjangoObjectType):
class Meta:
model = Trade
filter_fields = {
'id': ['exact', 'range', 'in', 'gte', 'lt'],
'updated': ['gte', 'lt'],
'created': ['gte', 'lt']
}
interface = (graphene.relay.Node,)
class Query(graphene.ObjectType):
trades = DjangoFilterConnectionField(TradeType)
所有这些都是我根据this page 完成的。
Exception in thread django-main-thread:
Traceback (most recent call last):
File "/usr/local/lib/python3.8/threading.py", line 932, in
_bootstrap_inner
self.run()
File "/usr/local/lib/python3.8/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "/usr/local/lib/python3.8/site-packages/django/utils/autoreload.py", line 64, in wrapper
fn(*args, **kwargs)
File "/usr/local/lib/python3.8/site-packages/channels/management/commands/runserver.py", line 69, in inner_run
self.check(display_num_errors=True)
File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 419, in check
all_issues = checks.run_checks(
File "/usr/local/lib/python3.8/site-packages/django/core/checks/registry.py", line 76, in run_checks
new_errors = check(app_configs=app_configs, databases=databases)
File "/usr/local/lib/python3.8/site-packages/django/core/checks/urls.py", line 13, in check_url_config
return check_resolver(resolver)
File "/usr/local/lib/python3.8/site-packages/django/core/checks/urls.py", line 23, in check_resolver
return check_method()
File "/usr/local/lib/python3.8/site-packages/django/urls/resolvers.py", line 412, in check
for pattern in self.url_patterns:
File "/usr/local/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/usr/local/lib/python3.8/site-packages/django/urls/resolvers.py", line 598, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/usr/local/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/usr/local/lib/python3.8/site-packages/django/urls/resolvers.py", line 591, in urlconf_module
return import_module(self.urlconf_name)
File "/usr/local/lib/python3.8/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
File "<frozen importlib._bootstrap>", line 991, in _find_and_load
File "<frozen importlib._bootstrap>", line 975, in
_find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 783, in exec_module
File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed
File "/app/tabdeal/urls.py", line 45, in <module>
path('utils/', include('utils.urls')),
File "/usr/local/lib/python3.8/site-packages/django/urls/conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "/usr/local/lib/python3.8/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
File "<frozen importlib._bootstrap>", line 991, in _find_and_load
File "<frozen importlib._bootstrap>", line 975, in
_find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 783, in exec_module
File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed
File "/app/utils/urls.py", line 6, in <module>
from utils.schema import schema
File "/app/utils/schema.py", line 200, in <module>
schema = graphene.Schema(query=Query)
File "/usr/local/lib/python3.8/site-packages/graphene/types/schema.py", line 78, in __init__
self.build_typemap()
File "/usr/local/lib/python3.8/site-packages/graphene/types/schema.py", line 167, in build_typemap
self._type_map = TypeMap(
File "/usr/local/lib/python3.8/site-packages/graphene/types/typemap.py", line 80, in __init__
super(TypeMap, self).__init__(types)
File "/usr/local/lib/python3.8/site-packages/graphql/type/typemap.py", line 31, in __init__
self.update(reduce(self.reducer, types, OrderedDict())) # type: ignore
File "/usr/local/lib/python3.8/site-packages/graphene/types/typemap.py", line 88, in reducer
return self.graphene_reducer(map, type)
File "/usr/local/lib/python3.8/site-packages/graphene/types/typemap.py", line 117, in graphene_reducer
return GraphQLTypeMap.reducer(map, internal_type)
File "/usr/local/lib/python3.8/site-packages/graphql/type/typemap.py", line 109, in reducer
field_map = type_.fields
File "/usr/local/lib/python3.8/site-packages/graphql/pyutils/cached_property.py", line 22, in __get__
value = obj.__dict__[self.func.__name__] = self.func(obj)
File "/usr/local/lib/python3.8/site-packages/graphql/type/definition.py", line 198, in fields
return define_field_map(self, self._fields)
File "/usr/local/lib/python3.8/site-packages/graphql/type/definition.py", line 212, in define_field_map
field_map = field_map()
File "/usr/local/lib/python3.8/site-packages/graphene/types/typemap.py", line 275, in construct_fields_for_type
map = self.reducer(map, field.type)
File "/usr/local/lib/python3.8/site-packages/graphene_django/fields.py", line 98, in type
assert _type._meta.connection, "The type {} doesn't have a connection".format(
AssertionError: The type TradeType doesn't have a connection
graphene==2.1.9，graphene_django==2.15，django-filter==2.4
【问题讨论】：