Skip to main content

subscription/publish - GraphQL

==
Front end:

export const ADD_PROJECT_SUBSCRIPTION = gql`
subscription projectAddedSubscription {
projectAdded {
id
projectName
accountId
...
}
}
`

subscribeToNewProject={() =>
subscribeToMore({
document: ADD_PROJECT_SUBSCRIPTION,
variables: {},
updateQuery: (prev, { subscriptionData }) => {
if (!subscriptionData.data) return prev
const newProject = subscriptionData.data.projectAdded
console.log(newProject)
return Object.assign({}, prev, {
projectsOfSat: [newProject, ...prev.projectsOfSat]
})
}
})
}

==
Resolver:
Mutation: {
addProject: combineResolvers(
isAuthenticated,
async (parent, { projectInput }, { models, me, pubsub }) => {
const { projectName, clientId } = projectInput
const project = await Project.create({
accountId: me.accountId,
projectName: projectName || 'default project',
clientId: clientId || 0
})

pubsub.publish('PROJECT_CHANNEL', { projectAdded: project })
return project
}
),

Subscription: {
projectAdded: {
subscribe: (parent, args, { pubsub }) => {
return pubsub.asyncIterator(PROJECT_CHANNEL)
}
}
}

Comments

Post a Comment

Popular posts from this blog

for loop in javascript - promise - .eslintrc for "for of"

the vast majority of cases  map ,  forEach ,  find  etc. can be used.  async function printFiles () { const files = await getFilePaths(); await Promise.all(files. map (async (file) => { const contents = await fs.readFile(file, 'utf8') console.log(contents) })); } const inventory = [ { name : 'apples' , quantity : 2 } , { name : 'bananas' , quantity : 0 } , { name : 'cherries' , quantity : 5 } ] ; const result = inventory . find ( ( { name } ) => name === 'cherries' ) ;   function getFirstMatching(array) { for (let item of array) { const result = heavyTransform(item); if (result) { return result; } } } Specifically this shuts down the whole no-restricted-syntax. If you want to cherry-pick, here is the current definition: 'no-restricted-syntax' : [ 'error' , { selector : 'ForInStatement' , message...
Post a Comment
Read more

Apollo client - cache APIs - auto update cache - erase cache - reactive variables - deletion - addition

Apollo Client 3  Local only fields Reactive Variables const cache = new InMemoryCache ( { typePolicies : { Todo : { // If one of the keyFields is an object with fields of its own, you can // include those nested keyFields by using a nested array of strings: keyFields : [ "date" , "user" , [ "email" ] ] , } } , } ) ; This internal data is intended to be easily  JSON-serializable , so you can take a snapshot with  cache.extract() , save it somewhere, and later restore with  cache.restore(snapshot) . Here’s a mutation called  EditTodo  that returns the new  todo  value in the mutation response. mutation EditTodo ( $id : Int ! , $text : String ! ) { editTodo ( id : $id , text : $text ) { success todo { # <- Returning it here id text completed } error { ... on TodoNotFoundError { message } ... on TodoValidationE...
Post a Comment
Read more

window.URL.createObjectURL is not (yet) available in jest-dom - testing scenario

Since  window.URL.createObjectURL  is not (yet) available in jest-dom, you need to provide a mock implementation for it. Don't forget to reset the mock implementation after each test. describe ( "your test suite" , () => { window . URL . createObjectURL = jest . fn (); afterEach (() => { window . URL . createObjectURL . mockReset (); }); it ( "your test case" , () => { expect ( true ). toBeTruthy (); }); });
Post a Comment
Read more