GraphQL.js Node/Express：如何将对象作为 GraphQL 查询参数传递

Question

我的目标是能够在 GraphQL 查询中将对象作为参数传递。

目标：

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

错误：

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

我尝试了几种不同的方法，但这似乎是最接近潜在解决方案的方法。

架构：

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

我在这里找到了解决方案。 https://github.com/mugli/learning-graphql/blob/master/7.%20Deep%20Dive%20into%20GraphQL%20Type%20System.md#graphqlinputobjecttype

架构：

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)},
    },
  }),
});

问题出在查询中，我将键和值都作为对象参数中的字符串。

正确查询：

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

Answer 2

您不将 filterType 定义为对象类型，然后将其包装在输入类型中，您实际上将其创建为输入类型：

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),
    },
  }),
});

您还需要在查询时声明其类型，如 @piotrbienias 的答案所示。