GraphQL.js Node / Express：如何將對象作為GraphQL查詢參數傳遞

Question

我的目標是能夠在GraphQL查詢中將對象作為參數傳遞。

目標：

{
    accounts (filter: 
      {"fieldName": "id",
      "fieldValues":["123"],
      "filterType":"in"}){
        id
      }
 }

錯誤：

"message": "filterType fields must be an object with field names as keys or a function which returns such an object."

我嘗試了一些不同的方法，但這似乎是最接近潛在的解決方案。

架構：

const filterType = new GraphQLObjectType ({
  name: 'filterType',
  fields: {
    fieldName: { type: GraphQLString },
    fieldValues: { type: GraphQLString },
    filterType: { type: GraphQLString },
  }
})

const QueryType = new GraphQLObjectType({
  name: 'Query',
  fields: () => ({
    accounts: {
      type: new GraphQLList(accountType),
      args: {
        filter: { type: new GraphQLInputObjectType(filterType) },
      },
      resolve: (root, args, { loaders }) => loaders.account.load(args),
    },

  }),
});

Answer 1

您沒有將filterType定義為對象類型，然后將其包裝在輸入類型中，您可以將其創建為輸入類型：

const filterType = new GraphQLInputObjectType({
  name: 'filterType',
  fields: {
    fieldName: { type: GraphQLString },
    fieldValues: { type: GraphQLString },
    filterType: { type: GraphQLString },
  }
})

const QueryType = new GraphQLObjectType({
  name: 'Query',
  fields: () => ({
    accounts: {
      type: new GraphQLList(accountType),
      args: {
        filter: { type: filterType },
      },
      resolve: (root, args, { loaders }) => loaders.account.load(args),
    },
  }),
});

您還需要在查詢時聲明其類型，如@ piotrbienias的回答所示。

Answer 2

我在這里找到了解決方案。 https://github.com/mugli/learning-graphql/blob/master/7.%20Deep%20Dive%20into%20GraphQL%20Type%20System.md#graphqlinputobjecttype

架構：

const filterType = new GraphQLInputObjectType({
  name: 'filterType',
  fields: {
    fieldName: { type: GraphQLString },
    fieldValues: { type: GraphQLString },
    filterType: { type: GraphQLString },
  }
})

const QueryType = new GraphQLObjectType({
  name: 'Query',
  fields: () => ({
    accounts: {
      type: new GraphQLList(accountType),
      args: {
        filter: { type: filterType },
      },
      resolve: (root, args, { loaders }) => {
        return loaders.account.load(args)},
    },
  }),
});

問題出現在查詢中，我在對象參數中將鍵和值都作為字符串。

正確查詢：

{
  accounts(filter: {fieldName: "id", fieldValues: "123", filterType: "in"}) {
    id
  }
}