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mongodb - 将用户输入传递给 GQL 查询

问题描述

我目前正试图弄清楚如何通过使用用户通过表单提交的文本数据作为返回结果数组的查询中的变量参数来实现搜索功能。AssetQueryInit 查询的结果很好。（AssetQueryInit 只是呈现硬编码查询的结果）

我是新手，任何帮助将不胜感激！

GraphQL 服务器

const typeDefs = `
  type Asset {
    _id: ID
    assetName: String
    headline: String
    language: String
    sentimentNegative: Float
    sentimentNeutral: Float
    sentimentPositive: Float
    firstCreated: String


  }
  type Query {
    asset(assetName: String!): Asset
    assetAll(assetName: String!): [Asset]
  }
`;

const resolvers = {
  Query: {
    asset: (_,{assetName})=> Asset.findOne({assetName : assetName }),
    assetAll: (_,{assetName}) => Asset.find({assetName: assetName})
  }
};

const server = new GraphQLServer({ typeDefs, resolvers });

反应

const AssetAllQuery = gql`
{
    assetAll(assetName: $text){
      _id
      assetName
      headline
      firstCreated
      sentimentNegative
      sentimentPositive
      sentimentNeutral
    }
} 
`;



class App extends Component {
  assetAll = async (text) =>{
    await this.props.assetAll({
      variables:{
        assetName: text
      },
      update:(store,{data: {assetAll}}) => {
        const data = store.readQuery({query: AssetAllQuery});
        data.assetAll.unshift(assetAll);
      }
    });
  };

  render() {
        const {
            data : { loading, assetAll }
          } = this.props;
        console.log("test");
    if(loading){
      return null;
    }
    return (
      <div className="App">
      <Form submit ={this.getAllAssets}/>
      {assetAll.map(Asset => <div key={Asset._id}>{Asset.headline} | {Asset.sentimentNeutral > Asset.sentimentPositive ?  (Asset.sentimentNeutral > Asset.sentimentNegative ? "Neutral" : "Sell") : "Buy"} </div>)}
      </div>
    );
  }
};

export default compose(
  graphql(AssetAllQuery, {name: "assetAll"}),
  graphql(AssetQueryInit)
  )(App);

输出

[GraphQL error]: Message: Variable "$text" is not defined., Location: [object Object],[object Object], Path: undefined  bundle.js:837:32

[Network error]: Error: Response not successful: Received status code 400

标签： mongodbmongoosegraphqlreact-apollo

解决方案

在查询中，$variables您使用的任何内容本质上都必须“声明”为整个事物的输入参数：

const AssetAllQuery = gql`
AssetAll($assetName: String!) {
    assetAll(assetName: $assetName){
        ...
    }
} 
`;

顶级操作名称并不重要；有$variable自己声明的类型，并且必须匹配查询主体中使用的类型；当您进行查询时，variables:那里的名称必须与声明的查询参数的名称相匹配。

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