How do I give parameters to function in GraphQL - node.js

Question

Actually, I'm a newbie to graphQL so I wasn't able to pass parameters rightly in function updateMessage() in graphiQL. I'm trying to update the database using
mutation {
createMessage(input: {
author: "Pawan",
content: "hope is a dangerous thing",
}) {
id,content,author,
}
updateMessage(id:{cfe934d60b9997a4507e},input:{
author: "Pawan",
content: "hope is a dangerous thing",
})
}
but the error is displayed as
{
"errors": [
{
"message": "Syntax Error: Expected :, found }",
"locations": [
{
"line": 8,
"column": 40
}
]
}
]
}
Beside I'm also not able to show fakeDatabase .Can I do that ?
if yes How can I show every time I add a message to the fakeDatabase?
mutation.js
var express = require('express');
var graphqlHTTP = require('express-graphql');
var { buildSchema } = require('graphql');
// Construct a schema, using GraphQL schema language
var schema = buildSchema(`
input MessageInput {
content: String
author: String
}
type Message {
id: ID!
content: String
author: String
}
type Query {
getMessage(id: ID!): Message
}
type Mutation {
createMessage(input: MessageInput): Message
updateMessage(id: ID!, input: MessageInput): Message
}
`);
// If Message had any complex fields, we'd put them on this object.
class Message {
constructor(id, {content, author}) {
this.id = id;
this.content = content;
this.author = author;
}
}
// Maps username to content
var fakeDatabase = {};
var root = {
getMessage: function ({id}) {
if (!fakeDatabase[id]) {
throw new Error('no message exists with id ' + id);
}
return new Message(id, fakeDatabase[id]);
},
createMessage: function ({input}) {
// Create a random id for our "database".
var id = require('crypto').randomBytes(10).toString('hex');
fakeDatabase[id] = input;
return new Message(id, input);
},
updateMessage: function ({id, input}) {
if (!fakeDatabase[id]) {
throw new Error('no message exists with id ' + id);
}
// This replaces all old data, but some apps might want partial update.
fakeDatabase[id] = input;
return new Message(id, input);
},
};
var app = express();
app.use('/graphql', graphqlHTTP({
schema: schema,
rootValue: root,
graphiql: true,
}));
console.log(fakeDatabase)
app.listen(4000, () => {
console.log('Running a GraphQL API server at localhost:4000/graphql');
});

Answer 1

On your mutation updateMessage try updating the parameters and send $id as a string instead of an object, like:
updateMessage(id:"cfe934d60b9997a4507e",input:{
author: "Pawan",
content: "hope is a dangerous thing",
})
The issue is that mutation updateMessage requires an ID and MessageInput, but you're sending Object and MessageInput.