如何在 GraphQl 中使用 graphql-type-json 包 [英] How to use graphql-type-json package with GraphQl

问题描述

我无法让 GraphQL 识别 JSON 标量类型.

I can't get GraphQL to recognize the JSON scalar type.

我遵循了 [apollo docs] (http://dev.apollodata.com/tools/graphql-tools/scalars.html#Using-a-package) 为我的模式定义一个 JSON GraphQL 标量类型:

I followed the [apollo docs] (http://dev.apollodata.com/tools/graphql-tools/scalars.html#Using-a-package) to define a JSON GraphQL scalar type for my schema:

架构:

const SchemaDefinition = `
   scalar JSON
   schema {
     query: Query
     mutation: Mutation
  }
`

export default [
  SchemaDefinition,
  Query,
  Mutation,
  ...
]

测试类型:

const Test = `
  type Test {
    bodyJson: JSON
 }`

解析器:

import GraphQLJSON from 'graphql-type-json'

const QueryResolver = {
  Query: {
    viewer(root, args, ctx) {
      return User.query()
        .where('id', ctx.state.user)
        .first()
     }
  }
}

const scalarJSON = {
  JSON: GraphQLJSON
}

export default {
  ...QueryResolver,
  ...ViewerResolver,
  ...scalarJSON
  ...
}

我使用的是 PostgreSQL，我查询的列 (body_json) 的数据类型为 jsonb.

I'm using PostgreSQL and the column I'm querying (body_json) is of data type jsonb.

如果我通过 GraphiQL 测试我的架构，当我直接从数据库返回值(我使用 Knex 进行查询)时，我会从 GraphQL 收到此错误消息:

If I test my schema through GraphiQL, when I return the value straight from the db (I use Knex to query) I get this error message from GraphQL:

应为 "JSON" 类型的值，但收到:[object Object]

Expected a value of type "JSON" but received: [object Object]

如果我首先在返回值上使用 JSON.stringify，我会收到这个错误:

If I use JSON.stringify first on the returned value, I get this error:

"期望类型为 "JSON" 的值但收到:{"key":"test"}"

"Expected a value of type "JSON" but received: {"key":"test"}"

对我可能做错了什么有什么建议吗?

Any suggestion as to what I might be doing wrong?

推荐答案

我在解析器中像这样解析了自定义标量 JSON

I resolved custom scalar JSON like this in resolvers

 JSON: {

__serialize(value) {
    return GraphQLJSON.parseValue(value);
} }

它对我来说效果很好.我想它会帮助你

And It worked fine for me. I think it will help you

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