Often I want to create a GraphQL type that represents the results of a Cypher query that spans than one node. I can't return a concrete node from @cypher in this case, as no such node exists. I tried to return appropriately named fields from a top-level @cypher query but this approach did not work.
import { makeAugmentedSchema, neo4jgraphql } from 'neo4j-graphql-js';
import { ApolloServer } from 'apollo-server';
import neo4j from 'neo4j-driver';
const typeDefs = `
type Person {
name: String
age: Int
}
type Query {
persons: [Person] @cypher(
statement: """
WITH [["foo", 42], ["bar", 43]] AS x UNWIND x AS y
RETURN y[0] AS name, y[1] AS age
"""
)
}
`;
const driver = neo4j.driver(
'bolt://localhost:7687',
neo4j.auth.basic('neo4j', 'password')
);
const resolvers = {
};
const schema = makeAugmentedSchema({ typeDefs, resolvers });
const server = new ApolloServer(
{
schema,
resolvers,
context: {driver}
}
)
server.listen(4000, '0.0.0.0').then(({ url }) => {
console.log(`GraphQL API ready at ${url}`);
});
Query:
{
persons {
name
age
}
}
Yields the error:
{
"errors": [
{
"message": "String(\"foo\") (of class org.neo4j.values.storable.StringWrappingStringValue)",
"locations": [
{
"line": 2,
"column": 3
}
],
"path": [
"persons"
],
"extensions": {
"code": "INTERNAL_SERVER_ERROR",
"exception": {
"code": "Neo.DatabaseError.General.UnknownError",
"name": "Neo4jError",
"stacktrace": [
"Neo4jError: String(\"foo\") (of class org.neo4j.values.storable.StringWrappingStringValue)",
"",
" at captureStacktrace (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/neo4j-driver/lib/result.js:277:15)",
" at new Result (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/neo4j-driver/lib/result.js:68:19)",
" at newCompletedResult (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/neo4j-driver/lib/transaction.js:449:10)",
" at Object.run (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/neo4j-driver/lib/transaction.js:287:14)",
" at Transaction.run (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/neo4j-driver/lib/transaction.js:123:32)",
" at _callee2$ (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/neo4j-graphql-js/dist/index.js:222:35)",
" at tryCatch (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/regenerator-runtime/runtime.js:63:40)",
" at Generator.invoke [as _invoke] (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/regenerator-runtime/runtime.js:293:22)",
" at Generator.next (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/regenerator-runtime/runtime.js:118:21)",
" at asyncGeneratorStep (/home/amoe/dev/neo4j-graphql-js-return-aggregate-type/node_modules/@babel/runtime-corejs2/helpers/asyncToGenerator.js:5:24)"
]
}
}
}
],
"data": {
"persons": null
}
}
I know I can satisfy individual fields with a per-field @cypher annotation, that's not appropriate for this case. This question is about satisfying a whole result type.
If the answer requires using a custom handler in the resolvers array, that's also fine, as long as I can gather the data required to satisfy the type within a single query. Or if this is impossible, that would also be useful information.