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11-29-2022 02:29 AM - edited 11-29-2022 02:30 AM
I've been trying to use neo4j graphql library with my existing database in neo4j. I was following the tutorial by William on "Graph Visualisation with GraphQL and react-force". But I'm getting this error that the particular node with it's "diagnosis_id" attribute isn't found. It is probably happening because it is a String and expects an Int. What do I do about this?
I'm attaching screenshots of the error ....
# this is pages/api/graphql.js file
import { gql, ApolloServer } from "apollo-server-micro";
import { Neo4jGraphQL } from "@neo4j/graphql";
import neo4j from "neo4j-driver";
const typeDefs = gql`
type Diagnosis @exclude(operations: [CREATE, UPDATE, DELETE]) {
diagnosis_id: ID
treatment: [Treatment!]! @relationship(type: "DiagnosisToTreatment", direction: OUT)
}
type Treatment @exclude(operations: [CREATE, UPDATE, DELETE]) {
treatment_id: ID
description: String
level1: String
level2: String
diagnosis: [Diagnosis!]! @relationship(type: "DiagnosisToTreatment", direction: IN)
}
`;
const driver = neo4j.driver(
process.env.NEO4J_URI,
neo4j.auth.basic(process.env.NEO4J_USER, process.env.NEO4J_PASSWORD)
);
export default async function handler(req, res) {
res.setHeader("Access-Control-Allow-Credentials", "true");
res.setHeader("Access-Control-Allow-Origin", "https://studio.apollographql.com");
res.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
if (req.method === "OPTIONS") {
res.end();
return false;
}
const neoSchema = new Neo4jGraphQL({ typeDefs, driver });
const apolloServer = new ApolloServer({ schema: await neoSchema.getSchema() });
await apolloServer.start();
await apolloServer.createHandler({
path: "/api/graphql",
})(req, res);
}
export const config = {
api: {
bodyParser: false,
},
};
# this is pages/index.js file
import dynamic from "next/dynamic"
import { useQuery, gql } from '@apollo/client';
import { useState } from 'react';
const mostRecentQuery = gql`
{
diagnoses (options: {limit:30}){
__typename
diagnosis_id
treatment {
__typename
treatment_id
level1
level2
description
}
}
}
`;
const NoSSRForceGraph = dynamic (() => import('../lib/NoSSRForceGraph'), {
ssr: false,
});
const formatData = (data) => {
const nodes = [];
const links = [];
if (!data.diagnoses) {
return (nodes, links)
}
data.diagnoses.forEach( (d) => {
nodes.push({
__typename: d.__typename,
diagnosis_id: d.diagnosis_id,
})
nodes.push({
__typename: d.treatment.__typename,
treatment_id: d.treatment.treatment_id,
level1: d.treatment.level1,
level2: d.treatment.level2,
description: d.treatment.description,
})
links.push({
source: d.diagnosis_id,
target: d.treatment.treatment_id
})
})
return {
nodes,
links
}
}
export default function Home() {
const [graphData, setGraphData] = useState({nodes: [], links: []})
const {data} = useQuery(mostRecentQuery, {
onCompleted: (data) => setGraphData(formatData(data))
})
return <NoSSRForceGraph nodeAuthColorBy={"__typename"} nodeLabel={"diagnosis_id"} graphData={graphData}/>
}
# this is pages/_app.js file
import {
ApolloProvider,
ApolloClient,
InMemoryCache,
HttpLink
} from '@apollo/client';
const createApolloClient = () => {
const link = new HttpLink({
uri: '/api/graphql'
});
return new ApolloClient({
link,
cache: new InMemoryCache()
});
};
function MyApp({ Component, pageProps }) {
return (
<ApolloProvider client={createApolloClient()}>
<Component {...pageProps} />
</ApolloProvider>
);
}
export default MyApp;
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