graphql - 子解析器中的Graphql-Access参数

Question

我正在使用apollo-server和apollo-graphql-tools并且具有以下架构

type TotalVehicleResponse {
  totalCars: Int
  totalTrucks: Int
}

type RootQuery {
  getTotalVehicals(color: String): TotalVehicleResponse
}

schema {
  query: RootQuery
}

和解析器功能是这样的

{
  RootQuery: {
    getTotalVehicals: async (root, args, context) => {
      // args = {color: 'something'}
      return {};
    },
    TotalVehicleResponse: {
      totalCars: async (root, args, conext) => {
        // args is empty({}) here
        .........
        .........
      },
      totalTrucks: async (root, args, conext) => {
        // args is empty({}) here
        .........
        .........
      }
    }
  }
}

我的问题是，如何访问任何子解析器中的根解析器（ args）中可用的 getTotalVehicals？

Answer 1

args严格引用查询中提供给该字段的参数。如果希望将值提供给子解析器，则只需从父解析器返回它们即可。

{
  RootQuery: {
    getTotalVehicles: async (root, args, context) => {
      return { color: args.color };
    },
    TotalVehicleResponse: {
      totalCars: async (root, args, context) => {
        // root contains color here
      },
      totalTrucks: async (root, args, context) => {
        // root contains color here
      }
    }
  }
}