I have a basic GraphQL query setup as follows:
Query.js:
const Query = {
dogs(parent, args, ctx, info) {
return [{ name: 'Snickers' }, { name: 'Sunny' }];
},
};
module.exports = Query;
schema.graphql:
type Dog {
name: String!
}
type Query {
dogs: [Dog]!
}
I created a function createServer()
for starting the server as follows:
const { GraphQLServer } = require('graphql-yoga');
const Mutation = require('./resolvers/Mutation');
const Query = require('./resolvers/Query');
const db = require('./db');
function createServer() {
return new GraphQLServer({
typeDefs: 'src/schema.graphql',
resolvers: {
Mutation,
Query,
},
resolverValidationOptions: {
requireResolversForResolveType: false,
},
context: req => ({ ...req, db }),
});
}
module.exports = createServer;
I then tried querying dogs
as follows:
query {
dogs {
name
}
}
But instead of getting the names from the array of dogs, I got the following error instead:
{
"data": null,
"errors": [
{
"message": "Cannot return null for non-nullable field Query.dogs.",
"locations": [
{
"line": 2,
"column": 3
}
],
"path": [
"dogs"
]
}
]
}
What seems to be causing this error?
This problem comes from AWS requiring certain standard values in the dynamoDB table, such as createdAt and updatedAd, just add these fields manually with a timestamp in dynamo db for further testing. A mutation always needs to be requested via id, this somehow was not clear to me when my schema was created by amplify codegen...
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With