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🤖 Sandbox code update #5

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57 changes: 57 additions & 0 deletions code/graphql/example.js
View file Open in desktop
Original file line number Diff line number Diff line change
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const { makeAugmentedSchema, inferSchema } = require("neo4j-graphql-js");
const { ApolloServer } = require("apollo-server");
const neo4j = require("neo4j-driver");

const main = async () => {
// Create Neo4j driver instance
const driver = neo4j.driver(
"bolt://<HOST>:<BOLTPORT>",
neo4j.auth.basic("<USERNAME>", "<PASSWORD>")
);

let typeDefs;
// GraphQL type definitions can be inferred from existing database or
// specified explicitly. Uncomment the lines below to specify typedefs explicitly
// otherwise typedefs will be inferred from existing database
//typeDefs = /* GraphQL */ `
//type Person {
// name: String
// knows: [Person] @relation(name: "KNOWS", direction: "OUT")
// friendCount: Int @cypher(statement:"RETURN SIZE( (this)-[:KNOWS]->(:Person))")
//}
//`;

const getInferredTypes = async (driver) => {
const schemaInferenceOptions = {
alwaysIncludeRelationships: false,
};

const results = await inferSchema(driver, schemaInferenceOptions);
return results.typeDefs;
};

if (!typeDefs) {
typeDefs = await getInferredTypes(driver);
}

// Create executable GraphQL schema from GraphQL type definitions,
// using neo4j-graphql.js to autogenerate resolvers
const schema = makeAugmentedSchema({
typeDefs,
});

// Create ApolloServer instance to serve GraphQL schema
// Inject Neo4j driver instance into the context object
// which is passed into each (autogenerated) resolver
const server = new ApolloServer({
context: { driver },
schema,
});

// Start ApolloServer
server.listen().then(({ url }) => {
console.log(`GraphQL server ready at ${url}`);
});
};

main();

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