graphql mutation & couchbase - graphql

Question

I'm starting working with graphQL with couchbase, and I have a small problem when I run a mutation, what I'm doing is save 2 object:
key: email#email.it
{
type: 'credential',
user_id: 'xxxx-xxxx-xxxx-xxxx',
password: 'jknelkjf'
}
key: xxxx-xxxx-xxxx-xxxx
{
type: 'user',
name: 'aaaa',
surname: 'bbbb'
}
this is my mutation function:
export default {
createUser: {
type: User,
args: {
email: { type: GraphQLString },
password: { type: GraphQLString },
name: { type: GraphQLString },
surname: { type: GraphQLString }
},
resolve(source, args, req) {
const _id = uuid();
return new Promise((resolve, reject) => {
bcrypt.hash(args.password, 10)
.then(hash => req.db.insert({}, args.email, {
password: hash,
user_id: _id,
type: "credential"
}))
.then(cred => req.db.insert({}, cred.user_id, {
name: args.name,
surname: args.surname,
type: "user"
}))
.then(user => {
return resolve(user);
})
.catch(err => {
return reject(err);
});
});
}
}
}
and these are my schemas
export const UserCredential = new GraphQLObjectType({
name: 'UserCredential',
fields: () => ({
user_id: { type: GraphQLString },
type: { type: GraphQLString },
id: { type: GraphQLString },
password: { type: GraphQLString }
})
});
export const User = new GraphQLObjectType({
name: 'User',
fields: () => ({
name: { type: GraphQLString },
surname: { type: GraphQLString },
type: { type: GraphQLString },
id: { type: GraphQLString },
credential: {
type: UserCredential,
resolve: (root, args, req) => {
const query = `SELECT META(credential).id,credential.* FROM {{bucket}} as credential WHERE credential.type="credential" AND credential.user_id=$1`;
return new Promise((resolve, reject) => {
req.db.runQuery(null, query, [root.id])
.then((res) => {
return resolve(res[0]);
})
.catch((err) => {
return reject(err);
})
});
}
}
})
});
the problem is that when I run the mutation the result is the user object with the credential field null, but if I add a timeout on the resolve of the mutation I get the user with the credential object...the insert function is something like this:
db.insert(result => {
return db.find(result.id)
})
do you have any advice?