apollo-server-express：如何解决内部订阅？

Question

在进行常规的graphQL查询时，我可以轻松获得嵌套对象或计算。 但在订阅内容时：

import matplotlib.pyplot as plt
import numpy as np

data = [1.4, 1.4, 1.4, 1.5, 1.5, 1.6, 1.7, 1.7, 1.7, 1.9, 1.9, 1.9, 1.9, 2.0, 
        2.0, 2.0, 2.1, 2.1, 2.1, 2.1, 2.2, 2.2, 2.3, 2.3, 2.3, 2.4, 2.5, 2.6, 
        2.7, 2.7, 2.8, 2.8, 2.8, 2.9, 2.9, 3.1, 3.1, 3.2, 3.2, 3.5, 3.6, 3.8]

fig, ax = plt.subplots(nrows=1, ncols=1)

bins=[1.4,1.5,1.6,1.7,1.9,2.0,2.1,2.2,2.3,2.4,2.5,2.6,2.7,2.8,2.9,3.1,3.2,3.5,3.6,3.8]

ax.hist(data, bins=bins, facecolor='blue', edgecolor='gray', rwidth=1, align='mid') 
ax.set_xticks(bins)

ax.set_ylabel('Frequency')
ax.set_xlabel('DRA Sizes(mm)')
ax.set_title('Frequencies of DRA Sizes in Males (mm)')

plt.show()

我添加subscription { Event(filter: { mutation_in: [CREATED] }) { node { title description start end seats bookings owner { email } } } } 或bookings后会立即中断。我在服务器上看不到任何错误消息。 QraphiQL仅显示owner { ... }作为响应。

架构的相关标准是：

[object Object]

和解析器：

type Event {
  id: ID!
  title: String!
  description: String!
  owner: User!
  seats: Int
  bookings: Int
  start: DateTime!
  end: DateTime!
  tickets: [EventTicket!]!
}


type Mutation {
  createEvent(event: EventInput!): Event
}
input EventInput {
  title: String!
  description: String!
  seats: Int
  start: DateTime!
  end: DateTime!
}


type Subscription {
  Event(filter: EventSubscriptionFilter): EventSubscriptionPayload
}
input EventSubscriptionFilter {
  mutation_in: [_ModelMutationType!]
}
type EventSubscriptionPayload {
  mutation: _ModelMutationType!
  node: Event
}
enum _ModelMutationType {
  CREATED
  UPDATED
  DELETED
}

有关如何处理此问题的任何想法（和/或如何获取正确的错误消息来调试^^）。

Answer 1

搜索后确定I found the solution/hack here。

    SubscriptionServer.create(
        {
           execute, subscribe, schema,
           onOperation: (message, params, webSocket) => {
            return { ...params, context: {mongo} }
          },
        },
        { server, path: '/subscriptions' },
    );

感谢nharraud。