graphql来自数组的输出值

Question

出现以下情况。我无法显示以下数组中的必要值。

{
  "data": {
    "car": {
      "mark": "BMW",
      "models": [
        {
          "model": "315",
          "generations": [
            {
              "generation": "(1934-1937)",
              "bodies": [
                {
                  "body": "Родстер"
                },
                {
                  "body": "Седан 2 дв."
                }
              ]
            }
          ]
        },
        {
          "model": "321",
          "generations": [
            {
              "generation": "I (1937-1950)",
              "bodies": [
                {
                  "body": "Седан 2 дв."
                }
              ]
            }
          ]
        },
        {
          "model": "326",
          "generations": [
            {
              "generation": "I (1936-1946)",
              "bodies": [
                {
                  "body": "Седан"
                }
              ]
            }
          ]
        }

在graphql中我有以下方案

export default `


type Transmission{
  transmission: String!
  capacity: [Int!]
}

type Engine{
  engine: String!
  transmissions: [Transmission]
}

type Body{
  body: String!
  engines: [Engine]
}

type Generation {
  generation: String!
  years: [Int!]
  bodies: [Body]

}

type Model {
  model: String!
  generations: [Generation]
}

  type Car {
    _id: String!
    mark: String!
    models: [Model]
          }

  type Query {
    car(_id: ID, mark: String): Car!
    cars: [Car!]!

  }

  type Mutation {
    createCar(car: CreateCarInput): Car!
    updateCar(_id: String!, car: UpdateCarInput!): Car!
    deleteCar(_id: String!): Car!
  }

  input CreateCarInput {
    name: String!
    email: String!
    age: Int!
  }

  input UpdateCarInput {
    name: String
    email: String
    age: Int
  } 
`;

graphql中的解析器是我的下一个

import Cars from "../../../models/Cars";

export default {
  Query: {
    car: async (parent, { _, args, mark }, context, info) => {
      return await Cars.findOne({ mark: mark }).exec();
    },     
    cars: async (parent, args, context, info) => {
      const cars = await Cars.find({})
        .sort({ mark: 1 })
        .populate()
        .exec();

      return cars.map(u => ({
        _id: u._id.toString(),
        mark: u.mark,
        models: u.models
      }));
    }
  },

我想在下一个请求时获取汽车型号

{
  car(mark:"BMW"){
  mark,
  models(model:"Z4")
  {
    model,
    generations
    {
      generation,
      bodies
      {
        body
      }
    }
  }
}
}

我遇到以下错误

{
  "errors": [
    {
      "message": "Unknown argument \"mark\" on field \"models\" of type \"Car\".",
      "locations": [
        {
          "line": 4,
          "column": 10
        }
      ]
    }
  ]
}

我是编程新手。几天来，我一直在为下一个错误而绞尽脑汁。如果有人说我做错了，我将不胜感激。