`Extensions` 字段未显示在 apollo graphql 响应数据中

Question

这是reproducible example。运行app.js 并在http://localhost:4000/graphql 的操场上导航

您可以运行如下查询：

query RecipeQuery{
  recipe(title:"Recipe 2"){
    description
  }
}

问题：

我需要来自响应数据中extensions 字段的调试信息。我说的是extensions这个字段：

  "data":{....},
  "extensions": {
    "tracing": {}
    "cacheControl":{}
  }

但实际上，我只得到数据字段：

  "data":{....}

我已经在阿波罗服务器配置中启用了tracing 和cacheControl，但是响应数据中仍然排除了extensions 字段。如何取回extensions 数据？

以下是阿波罗引擎的启动方式：

const expressApp = express();

const server = new ApolloServer({
    schema,
    tracing: true,
    cacheControl: true,
    engine: false, // we will provide our own ApolloEngine
});

server.applyMiddleware({ app: expressApp });

const engine = new ApolloEngine({
    apiKey: "YOUR_ID",

});

engine.listen(
    {
        port,
        expressApp,
        graphqlPaths: [graphqlEndpointPath],
    },
    () => console.log(`Server with Apollo Engine is running on http://localhost:${port}`),
);

依赖关系

  "dependencies": {
    "apollo-cache-control": "^0.1.1",
    "apollo-engine": "^1.1.2",
    "apollo-server-express": "^2.2.2",
    "graphql-depth-limit": "^1.1.0",
    "graphql-yoga": "^1.16.7",
    "type-graphql": "^0.15.0"
  }

Answer 1

您可以使用 formatResponse 格式化来自 apollo 的响应。

const server = new ApolloServer({
  typeDefs,
  resolvers,
  formatResponse: response => {
    console.log(response); 
    /* 
    ** { data } with informations such as queryType,
    ** directives ...
    ** I guess there is also the extensions key 
    */
    return response;
  }
});

doc