I'm trying to implement mutation query with an array as a parameter and String as a return type.
Here is my schema file:
input OrganizationInput {
orgId: String!
orgName: String!
}
type Mutations {
importOrganizations(input: [OrganizationInput]): String
}
Here is my mutation:
mutation importOrganizations($orgs: [OrganizationInput]) {
importOrganizations(
input: {
orgId: id,
orgName: name
}
)
}
This code doesn't work, but I don't know how to do it properly.
Maybe someone more experienced in GraphQL could help me?
Do you have any errors that can help?
Anyways your mutation need to return fields, e.g.:
mutation importOrganizations($orgs: [OrganizationInput]) {
importOrganizations(
input: {
orgId: id,
orgName: name
})
{
id
name
}
}
Related
I'm pretty new to graphql and I'm working on a project in nodejs where I am trying to return users when a getUsers query is performed. The issue is that when I test this query in graphql studio, I'm getting an error stating: "GraphQLError: Cannot query field \"users\" on type \"User\". I'm really confused as to why I'm having this issue. I've seen a number of examples where people where able to return just an array and didn't have a problem, but every time I've tried this I end up getting a similar error. Due to this, I've only been able to return a value for a query or mutation when I am super specific such as for my user query:
...
const user = await requireAuth(user)
return {
_id: user._id,
username: user.username,
firstName: user.firstName,
email: user.email,
}
Does anyone know why this is happening? I would really appreciate any help or advice. Thank you!
Query getUsers in graphql,
{
getUsers {
users
}
}
Query in user-resolvers.js
getUsers: async(parent, args, context, info) => {
try {
let users = await User.find()
console.log(users)
// console.log(users) shows all of the users in the format found in type Users
return users;
}
catch (error) {
throw error;
}
},
schema.js
export default`
type Users {
_id: ID!
username: String
email: String!
firstName: String
lastName: String
basicInfo: [BasicInfo]!
avatar: String
date: Date
}
type BasicInfo {
birth_date: String!
age: Int!
feet: Int!
inches: Int!
}
...
type Query {
getUsers: [Users]
}
...
schema {
query: Query
mutation: Mutation
}
`;
index.js
import UserResolvers from './user-resolvers.js';
import User from '../../models/User.js';
export default {
Query: {
user: UserResolvers.user,
getUsers: UserResolvers.getUsers,
},
...
};
In the query you specify the fields you want to return and you don't have a field users, you must only specify fields that exist in your schema:
{
getUsers {
id
username
email
...
}
}
More info here
I am trying to trigger a mutation in the aws console. I have linked my resolver function to a None type data source.
However, when I define my mutation with an input type as a parameter, the error " Error Cannot return null for non-nullable type: 'String' within parent MyModelType' (/createMyModelType/id)." occurs. Everything is fine though if I replace the input type with key word arguments.
I am certain it has to do with my resolver mapping template.
Just if you're wondering why I am using a None type, I want to be able to trigger a subscription without making real database changes or mutations.
I am not sure how to make it work with input types. Here is my code for the template:
{
"version": "2017-02-28",
"payload": $util.toJson($context.args)
}
My Schema:
input CreateMyModelType5Input {
title: String
}
type Mutation {
createMyModelType5(input: CreateMyModelType5Input!): MyModelType5
}
type MyModelType5 {
id: ID!
title: String
}
type Subscription {
onCreateMyModelType5(id: ID, title: String): MyModelType5
#aws_subscribe(mutations: ["createMyModelType5"])
}
Query I am trying to run:
mutation createMyModelType($createmymodeltypeinput: CreateMyModelTypeInput!) {
createMyModelType(input: $createmymodeltypeinput) {
id
title
}
}
Query Variables for the mutation query
{
"createmymodeltype5input": {
"title": "Hello, world!"
}
}
So I have been working on passing my arguments in the graphql mutation and using the input type seemed the only straight forward way around.
However, I have been able to do it with this way:
mutation = """mutation CreateMyModelType($id: String!, $title: String!){
createMyModelType(id: $id, title: $title){
id
title
}
}
"""
input_params = {
"id": "34",
"title": "2009-04-12"
}
response = app_sync.createMyModelType(mutation, input_params)
this can be a good guide
If I have a query user and it takes uuid but my variables are deep user.uuid can I pass uuid to the user query?
query User($user.uuid: string) {
user (uuid:$user.uuid) {
createdAt
}
}
Query Variables:
{
"user":{
"uuid": "abc"
}
}
No, the current GraphQL spec does not support referencing properties of a variable if that variable is an object. You may pass in object variables, but they may only be used where an input object is expected, for example, given a schema like:
type Mutation {
createUser(input: UserInput!): User!
}
input UserInput {
email: String!
}
we can do
mutation ($input: UserInput!) {
createUser(input: $input) {
email
}
}
However, if the expected input is a scalar:
type Mutation {
createUser(email: String!): User!
}
we must provide the scalar as a separate variable:
mutation ($email: String!) {
createUser(email: $email) {
email
}
}
Say I have the following GraphQL Schema
query {
allAuthors: [Author]
}
type Author {
id: ID!
name: String!
books: [Book]
}
type Book {
id: ID!
name: String!
author: Author!
}
Now I can successfully run the following query to get all the authors and their associated books
query {
allAuthors {
name,
books {
name
}
}
}
However, if I only want to get the first three books for all authors, how would I go about doing something like that? Can we index the books field in the Author type from within a query? If so, how?
I tried something like this and it doesn't work
query {
allAuthors {
name,
books[3] {
name
}
}
}
GraphQL doesn't have syntax for this.
You can add a "limit" parameter to a field, and this is common enough:
type Query {
allAuthors(limit: Int, offset: Int): [Author!]!
}
type Author {
id: ID!
name: String!
books(limit: Int, offset: Int): [Book!]!
}
If you add parameters like this to the schema, then the query you want (for all authors, get the first three books) could look like
{
allAuthors {
name
books(limit: 3) {
name
}
}
}
Given a GraphQL schema and resolvers for Apollo Server, and a GraphQL query, is there a way to create a collection of all requested fields (in an Object or a Map) in the resolver function?
For a simple query, it's easy to recreate this collection from the info argument of the resolver.
Given a schema:
type User {
id: Int!
username: String!
roles: [Role!]!
}
type Role {
id: Int!
name: String!
description: String
}
schema {
query: Query
}
type Query {
getUser(id: Int!): User!
}
and a resolver:
Query: {
getUser: (root, args, context, info) => {
console.log(infoParser(info))
return db.Users.findOne({ id: args.id })
}
}
with a simple recursive infoParser function like this:
function infoParser (info) {
const fields = {}
info.fieldNodes.forEach(node => {
parseSelectionSet(node.selectionSet.selections, fields)
})
return fields
}
function parseSelectionSet (selections, fields) {
selections.forEach(selection => {
const name = selection.name.value
fields[name] = selection.selectionSet
? parseSelectionSet(selection.selectionSet.selections, {})
: true
})
return fields
}
The following query results in this log:
{
getUser(id: 1) {
id
username
roles {
name
}
}
}
=> { id: true, username: true, roles: { name: true } }
Things get pretty ugly pretty soon, for example when you use fragments in the query:
fragment UserInfo on User {
id
username
roles {
name
}
}
{
getUser(id: 1) {
...UserInfo
username
roles {
description
}
}
}
GraphQL engine correctly ignores duplicates, (deeply) merges etc. queried fields on execution, but it is not reflected in the info argument. When you add unions and inline fragments it just gets hairier.
Is there a way to construct a collection of all fields requested in a query, taking in account advanced querying capabilities of GraphQL?
Info about the info argument can be found on the Apollo docs site and in the graphql-js Github repo.
I know it has been a while but in case anyone ends up here, there is an npm package called graphql-list-fields by Jake Pusareti that does this. It handles fragments and skip and include directives.
you can also check the code here.