I have two GraphQL/Relay mutations that work fine separately. The first one creates an item. The second one runs a procedure for connecting two items.
GraphQL
createOrganization(
input: CreateOrganizationInput!
): CreateOrganizationPayload
createOrganizationMember(
input: CreateOrganizationMemberInput!
): CreateOrganizationMemberPayload
input CreateOrganizationInput {
clientMutationId: String
organization: OrganizationInput!
}
input CreateOrganizationMemberInput {
clientMutationId: String
organizationMember: OrganizationMemberInput!
}
# Represents a user’s membership in an organization.
input OrganizationMemberInput {
# The organization which the user is a part of.
organizationId: Uuid!
# The user who is a member of the given organization.
memberId: Uuid!
}
type CreateOrganizationPayload {
clientMutationId: String
# The `Organization` that was created by this mutation.
organization: Organization
# An edge for our `Organization`. May be used by Relay 1.
organizationEdge(
orderBy: OrganizationsOrderBy = PRIMARY_KEY_ASC
): OrganizationsEdge
# Our root query field type. Allows us to run any query from our mutation payload.
query: Query
}
I would like to be able to run the createOrganization mutation and then connect the user to the organization with the createOrganizationMember mutation. The second mutation takes two arguments, one of which is the newly created edge.
I tried passing the edge into the mutation, but it expects the mutation to be able to getFragment. How can I get the fragment for the payload edge so it can be passed into a mutation?
React-Relay
Relay.Store.commitUpdate(
new CreateOrganizationMutation({
organizationData: data,
user,
query,
}), {
onSuccess: response => {
Relay.Store.commitUpdate(
new CreateOrganizationMemberMutation({
organization: response.createOrganization.organizationEdge.node,
user,
})
);
},
}
);
fragments: {
user: () => Relay.QL`
fragment on User {
${CreateOrganizationMutation.getFragment('user')},
${CreateOrganizationMemberMutation.getFragment('user')},
}
`,
I solved this problem without changing any GraphQL:
I created a new Relay container, route, and queries object. It is configured as a
child route for the container where the first of two mutation occurs. The id for
the new edge is passed as a parameter via the route pathname. A router state
variable is also passed.
Routes
import {Route} from 'react-router';
function prepareProfileParams (params, {location}) {
return {
...params,
userId: localStorage.getItem('user_uuid'),
};
}
// ProfileContainer has the component CreateOrganizationForm, which calls
// the createOrganization mutation
<Route
path={'profile'}
component={ProfileContainer}
queries={ProfileQueries}
prepareParams={prepareProfileParams}
onEnter={loginBouncer}
renderLoading={renderLoading}
>
<Route path={'join-organization'}>
<Route
path={':organizationId'}
component={JoinOrganizationContainer}
queries={JoinOrganizationQueries}
renderLoading={renderLoading}
/>
</Route>
</Route>
CreateOrganizationForm.js
Relay.Store.commitUpdate(
new CreateOrganizationMutation({
organizationData: data,
user,
query,
}), {
onSuccess: response => {
const organizationId = response.createOrganization.organizationEdge.node.rowId;
router.push({
pathname: `/profile/join-organization/${organizationId}`,
state: {
isAdmin: true,
},
});
},
}
);
The new Relay container JoinOrganizationContainer will hook into a lifecycle
method to call the second mutation that we needed. The second mutation has an
onSuccess callback which does router.push to the page for the new object we
created with the first mutation.
JoinOrganizationContainer.js
import React from 'react';
import Relay from 'react-relay';
import CreateOrganizationMemberMutation from './mutations/CreateOrganizationMemberMutation';
class JoinOrganizationContainer extends React.Component {
static propTypes = {
user: React.PropTypes.object,
organization: React.PropTypes.object,
};
static contextTypes = {
router: React.PropTypes.object,
location: React.PropTypes.object,
};
componentWillMount () {
const {user, organization} = this.props;
const {router, location} = this.context;
Relay.Store.commitUpdate(
new CreateOrganizationMemberMutation({
user,
organization,
isAdmin: location.state.isAdmin,
}), {
onSuccess: response => {
router.replace(`/organization/${organization.id}`);
},
}
);
}
render () {
console.log('Joining organization...');
return null;
}
}
export default Relay.createContainer(JoinOrganizationContainer, {
initialVariables: {
userId: null,
organizationId: null,
},
fragments: {
user: () => Relay.QL`
fragment on User {
${CreateOrganizationMemberMutation.getFragment('user')},
}
`,
organization: () => Relay.QL`
fragment on Organization {
id,
${CreateOrganizationMemberMutation.getFragment('organization')},
}
`,
},
});
JoinOrganizationQueries.js
import Relay from 'react-relay';
export default {
user: () => Relay.QL`
query { userByRowId(rowId: $userId) }
`,
organization: () => Relay.QL`
query { organizationByRowId(rowId: $organizationId) }
`,
};
One unexpected benefit of doing things this way is that there is now a shareable url that can be used as an invite link for joining an organization in this app. If the user is logged in and goes to the link: <host>/profile/join-organization/<organizationRowId>, the mutation will run that joins the person as a member. In this use case, router.state.isAdmin is false, so the new membership will be disabled as an admin.
Related
Let's say I have a simple GraphQL type for a user:
type User {
id: ID!
name: String!
}
Query {
user(id:ID!)
}
and a resolver
user = (_, {id}, {api})=> api.getUser(id)
Now I have add a new field to the User called friends and added a new resolver for the User.friends field.
friends = ({id}, _, {api})=> api.getFriends(id)
So now I wonder when we made a query like this, how can I prevent the call to api.getUser but only call api.getFriends.
query {
user(id){
friends {
name
}
}
}
My understanding is that having a resolver defined for the user field in the Query type, it will always call this resolver first and after that all resolvers for fields in the User type.
This is a common problem and there is for example this solution out there: https://github.com/gajus/graphql-lazyloader
Check out the README of the project for a structured description of your problem.
Alternatively, you can implement your own class that contains a cached value making use of how GraphQL.js implements default resolvers:
class User {
constructor(id) {
this.id = id;
}
getInstance({ api }) {
if (!this.instance) {
this.instance = api.getUser(this.id);
}
return this.instance;
}
// notice how id is already a property of this class
name(args, ctx) {
return this.getInstance(ctx).then(instance => instance.name);
}
// do the same for other fields, user will only be fetched once.
friends(args, { api }) {
return api.getFriends(this.id);
}
}
const resolvers = {
Query: {
user: (args) => new User(args.id),
}
}
If you use dataloader you can even do this with even less code thanks to caching in dataloader:
// You probably have this function already somewhere in your apollo server creation
function createContext({ api }) {
return {
api,
loaders: {
user: new Dataloader((ids) => ids.map(id => api.getUser(id))),
},
}
}
const resolvers = {
Query: {
user: (parent, args) => ({ id: args.id }),
},
User: {
name: ({ id }, args, { loaders }) =>
loaders.user.load(id).then(user => user.name),
otherProp: ({ id }, args, { loaders }) =>
loaders.user.load(id).then(user => user.otherProp),
friends: ({ id }, args, { api })=> api.getFriends(id),
}
}
Dataloader will, even when called twice, only reach to the API once. An added benefit is, that it will cache the value. Ideally, you even provide a batch load function in the API to make the loader even more efficient.
Be aware, that user.fields.name now makes calls for every friend to the API. To avoid that, you could check if the property exists:
name: (parent, args, { loaders }) =>
parent.name ?? loaders.user.load(parent.id).then(user => user.name),
Im using React with Apollo (Apollo Client v2). I have group query which needs to return a single group.
This code is working but I've hard coded HARD-CODED-ID. How can I instead pass the ID as a string from the React component?
In my React component:
const groupQuery = gql`
query Group {
group {
_id
name
}
}
`;
export default graphql(groupQuery, {
props: ({ data }) => ({ ...data }),
})(GroupPage);
My resolver:
Query: {
groups() {
return Groups.find().fetch();
},
group() {
return Groups.findOne('HARD-CODED-ID');
},
}
There's three things that you'll need to do:
1.) If you haven't already, modify the schema on your server so that your query accepts the id as an input, for example:
type Query {
#other queries
group(id: ID!): Group
}
2.) Modify your resolver so that it handles the passed-in id. Assuming you're using graphql-tools:
group(root, { id }) {
return Groups.findOne(id); // did you mean something like findOne({id}) ?
},
3.) Modify your client-side code. Typically, you'll make the id a prop you pass in to your component, and then use that as a variable in your request.
const groupQuery = gql`
query Group($id: ID!) {
group(id: $id) {
_id
name
}
}
`;
// assuming that the component prop is called groupId
export default graphql(groupQuery, {
options: ({ groupId }) => ({
variables: { id: groupId },
}),
})(GroupPage);
Instead of an object, options can be a function, in which case it's passed the component's props as its first parameter. You can then use those props to define the variables your query will use. You can read more about using variables with Apollo client here and here.
I am working on a very simple app which contains Posts and comments on those Posts. I have got
1) comment_mutation.js ( Server side - i am publishing the saved comment using pubsub). I have removed unnecessary code
CommentCreateMutation: mutationWithClientMutationId({
name: 'CommentCreate',
inputFields: {
},
outputFields: {
commentEdge: {
type: GraphQLCommentEdge,
resolve: async ({ comment, postId }) => {
// Publishing change to the COMMENT_ADDED subscription.
await pubsub.publish(COMMENT_SUB.COMMENT_ADDED, { commentAdded: commentEdge, postId });
return commentEdge;
},
},
},
mutateAndGetPayload: () => {
// Save comment in DB
},
}),
2) CommentSubscription.js (server side) - getting the subscription and filtering it based on postId.
commentAdded: {
type: GraphQLCommentEdge,
args: {
postId: { type: new GraphQLNonNull(GraphQLID) },
...connectionArgs,
},
subscribe:
withFilter(
() => pubsub.asyncIterator(COMMENT_SUB.COMMENT_ADDED),
(payload, args) => payload.postId === args.postId
),
},
Server side is working very good. Whenever any comment is created it publishes the result to subscrition. Subscription catches it and displays the results.
Now the client side:
1) CommentMutaton.js - client side. Whenever user himself creates a comment on client side (react native) it is updating the store very well.
const mutation = graphql`
mutation CommentCreateMutation($input:CommentCreateInput!) {
commentCreate(input: $input) {
commentEdge {
__typename
cursor
node {
id
_id
text
}
}
}
}
`;
const commit = (environment, user, post, text, onCompleted, onError) => commitMutation(
environment, {
mutation,
variables: {
input: { userId: user._id, userName: user.userName, postId: post._id, text },
},
updater: (store) => {
// Update the store
},
optimisticUpdater: (store) => {
// Update the store optimistically
},
onCompleted,
onError,
},
);
2) CommentSubscription.js (client side)
const subscription = graphql`
subscription CommentAddedSubscription($input: ID!) {
commentAdded(postId: $input) {
__typename
cursor
node {
id
_id
text
likes
dislikes
}
}
}
`;
const commit = (environment, post, onCompleted, onError, onNext) => requestSubscription(
environment,
{
subscription,
variables: {
input: post._id,
},
updater: (store) => {
const newEdge = store.getRootField('commentAdded');
const postProxy = store.get(post.id);
const conn = ConnectionHandler.getConnection(
postProxy,
'CommentListContainer_comments',
);
ConnectionHandler.insertEdgeAfter(conn, newEdge);
},
onCompleted,
onError,
onNext,
}
);
export default { commit };
Problem is on client side. Whenever i create a comment on server side I can see the first comment rightly on client side. When i send another comment on server side i can see 2 same comments on client side. When i send comment third time i can see 3 same comments on client side. Does it mean:
every time comment_mutation.js (on server side) runs it create a new
subscription besides existing one. That is the only logical
explanation i can think of.
I commented out the updater function of CommentMutation.js (on client side) but still seeing this error. any help will be much appreciated.
what is the correct point to authenticate a user ?
going by the relay starter kit as an example.
this would seem like be the point to query (i have added the args id )
var queryType = new GraphQLObjectType({
name: 'Query',
fields: () => ({
node: nodeField,
// Add your own root fields here
viewer: {
args: {
id: {
type: GraphQLString
},
},
type: userType,
resolve: (_, args) => getViewer(args.id),
},
}),
});
then in the database do something like
getViewer: (id) => id === viewer.id ? viewer : null,
now its this point where it's falling apart, where would be the place to request the id be made from ? i would assume the route
export default class extends Relay.Route {
static queries = {
viewer: () => Relay.QL`
query {
viewer(id:"1")
}
`,
};
static routeName = 'AppHomeRoute';
}
this isn't working.
First you need to drop an auth middleware into your server (http://passportjs.org/ for instance).Then you have to pass the auth information to the graphql middleware (read about how to do it here https://github.com/graphql/express-graphql#advanced-options) and you can finally access that information using the 3rd argument to the resolve(parentValue, args, -->session) function. Here's what the actual auth endpoint could look like https://github.com/igorsvee/react-relay-example/blob/master/server/routes.js#L29-L51
Is it possible to authenticate users with different roles solely trough a graphql server in combination with relay & react?
I looked around, and couldn't find much info about this topic.
In my current setup, the login features with different roles, are still going trough a traditional REST API... ('secured' with json web tokens).
I did it in one of my app, basically you just need a User Interface, this one return null on the first root query if nobody is logged in, and you can then update it with a login mutation passing in the credentials.
The main problem is to get cookies or session inside the post relay request since it does'nt handle the cookie field in the request.
Here is my client mutation:
export default class LoginMutation extends Relay.Mutation {
static fragments = {
user: () => Relay.QL`
fragment on User {
id,
mail
}
`,
};
getMutation() {
return Relay.QL`mutation{Login}`;
}
getVariables() {
return {
mail: this.props.credentials.pseudo,
password: this.props.credentials.password,
};
}
getConfigs() {
return [{
type: 'FIELDS_CHANGE',
fieldIDs: {
user: this.props.user.id,
}
}];
}
getOptimisticResponse() {
return {
mail: this.props.credentials.pseudo,
};
}
getFatQuery() {
return Relay.QL`
fragment on LoginPayload {
user {
userID,
mail
}
}
`;
}
}
and here is my schema side mutation
var LoginMutation = mutationWithClientMutationId({
name: 'Login',
inputFields: {
mail: {
type: new GraphQLNonNull(GraphQLString)
},
password: {
type: new GraphQLNonNull(GraphQLString)
}
},
outputFields: {
user: {
type: GraphQLUser,
resolve: (newUser) => newUser
}
},
mutateAndGetPayload: (credentials, {
rootValue
}) => co(function*() {
var newUser = yield getUserByCredentials(credentials, rootValue);
console.log('schema:loginmutation');
delete newUser.id;
return newUser;
})
});
to keep my users logged through page refresh I send my own request and fill it with a cookie field... This is for now the only way to make it work...