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No ability to get QuerySet in relay.Connection when use custom resolver in graphene.ObjectType #249

Description

@raprek

When I want to add some custom resolver (some complicated filter for example) for graphene.ObjectType I will lose opportunity to get filtered count number in Connection and etc. Example:

class Connection(relay.Connection):
    """Connection class"""

    class Meta:
        """Meta class"""
        abstract = True

    total_count = graphene.Int()

    def resolve_total_count(root, info, **kwargs):
        """Counts total number of documents with filters"""
        return root.iterable.count() 

class SomeModel(MongoengineObjectType):
    class Meta:
        connection_class = Connection

    
class SomeQueryRely(graphene.ObjectType):
    q = MongoengineConnectionField(SomeModel, filter_one = graphene.String(name="filter_one"), filter_two =graphene.String(name="filter_two"))
    def resolve_q(self, info: GraphQLResolveInfo, **kwargs):
        query: QuerySet = info.context.queryset
        QuerySet.filter(Q(filter_one=kwargs["filter_one"]) | Q(filter_two=kwargs["filter_two"]))
        return query

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