GraphQL错误 - 参数类型必须是输入类型但得到:undefined

Question

我有

export const getPicture = {
    type: GraphPicture,
    args: {
        type: new GraphQLNonNull(GraphQLInt)
    },
    resolve(_, args) {
        return Picture.findByPrimary(args.id);
    }
};

export const getPictureList = {
    type: new GraphQLList(GraphPicture),
    resolve(_, __, session) {
        return Picture.findAll({where: {owner: session.userId}});
    }
};

和

const query = new GraphQLObjectType({
    name: 'Queries',
    fields: () => {
        return {
            getPictureList: getPictureList,
            getPicture: getPicture
        }
    }
});

const schema = new GraphQLSchema({
    query: query,
    mutation: mutation
});

哪个投掷:

Error: Queries.getPicture(type:) argument type must be Input Type but got: undefined.

getPictureList工作正常,getPicture失败.

我试过让getPicture成为GraphQLLIst,但没有帮助.

我试过让args类型为输入类型,但没有帮助.

关于这里发生了什么的任何想法

堆栈跟踪是:

Error: Queries.getPicture(type:) argument type must be Input Type but got: undefined.
at invariant (/home/jrootham/dev/trytheseon/node_modules/graphql/jsutils/invariant.js:19:11)
at /home/jrootham/dev/trytheseon/node_modules/graphql/type/definition.js:307:33
at Array.map (native)
at /home/jrootham/dev/trytheseon/node_modules/graphql/type/definition.js:304:52
at Array.forEach (native)
at defineFieldMap (/home/jrootham/dev/trytheseon/node_modules/graphql/type/definition.js:293:14)
at GraphQLObjectType.getFields (/home/jrootham/dev/trytheseon/node_modules/graphql/type/definition.js:250:46)
at /home/jrootham/dev/trytheseon/node_modules/graphql/type/schema.js:224:27
at typeMapReducer (/home/jrootham/dev/trytheseon/node_modules/graphql/type/schema.js:236:7)
at Array.reduce (native)
at new GraphQLSchema (/home/jrootham/dev/trytheseon/node_modules/graphql/type/schema.js:104:34)
at Object.<anonymous> (/home/jrootham/dev/trytheseon/server/graphQL.js:45:16)
at Module._compile (module.js:399:26)
at normalLoader (/usr/lib/node_modules/babel/node_modules/babel-core/lib/babel/api/register/node.js:160:5)
at Object.require.extensions.(anonymous function) [as .js] (/usr/lib/node_modules/babel/node_modules/babel-core/lib/babel/api/register/node.js:173:7)
at Module.load (module.js:345:32)
at Function.Module._load (module.js:302:12)
at Module.require (module.js:355:17)
at require (internal/module.js:13:17)
at Object.<anonymous> (/home/jrootham/dev/trytheseon/devServer.js:14:44)
at Module._compile (module.js:399:26)
at normalLoader (/usr/lib/node_modules/babel/node_modules/babel-core/lib/babel/api/register/node.js:160:5)

Answer 1

仅供参考,我在这里搜索相同的错误undefined,但没有,但我自己的Product类型:

... argument * must be Input Type but got Product

事实证明,在GraphQL中,传递给Mutation的内容应该是标量类型(String,Integer,...)或用户定义的input类型,而不是type类型.

http://graphql.org/graphql-js/mutations-and-input-types/

input ProductInput {
  id: ID
  name: String
}

我试图传递我的产品type:

type Product {
  id: ID
  name: String
}

这感觉有点多余,但猜测,我会很高兴以后将它分开.

Answer 2

问题不是查询的返回类型,而是您为args指定的类型.

export const getPicture = {
    type: GraphPicture,
    args: {
        type: new GraphQLNonNull(GraphQLInt)
    },
    resolve(_, args) {
        return Picture.findByPrimary(args.id);
    }
};

假设你打算有一个名为"type"的参数,它应该是:

export const getPicture = {
    type: GraphPicture,
    args: {
        type: {
             type: new GraphQLNonNull(GraphQLInt)
        }
    },
    resolve(_, args) {
        return Picture.findByPrimary(args.id);
    }
};

这是graphql-js repo的一个例子:

hero: {
  type: characterInterface,
  args: {
    episode: {
      description: 'If omitted, returns the hero of the whole saga. If ' +
                   'provided, returns the hero of that particular episode.',
      type: episodeEnum
    }
  },
  resolve: (root, { episode }) => getHero(episode),
},

请参阅graphql-js repo中的完整模式:https://github.com/graphql/graphql-js/blob/master/src/ tests /starWarsSchema.js