Unable to use Fragments on GraphQL-yoga with Primsa - graphql

Question

I am using graphql-yoga with Prisma and Prisma-Bindings
I'm trying to add a fragment to my resolver so that a specific field (id in this situation) is always fetched when the user asks for a custom field, costsToDate.
This is so i can make some additional queries needed to build the result for that field, and i need the ID of the object for that.
Unfortunatley i can't seem to get it to work, and the documentations seems a little lacking on the specifics with graphql-yoga and Prisma.
Here is the definition of the type:
type Job {
id: ID!
projectNumber: String!
client: Client!
name: String!
description: String
quoteNumber: String
workshopDaysQuoted: String!
quoted: String!
targetSpend: String!
costs: [JobCost!]!
estimatedCompletion: DateTime
completed: Boolean!
costTotal: String
workshopDaysUsed: String
costsToDate: String
}
And here is the resolver for the query:
const jobs = {
fragment: `fragment description on Jobs { id }`,
resolve: jobsResolver
}
async function jobsResolver(root, args, context, info) {
await validatePermission(args,context,info,['admin','user','appAuth'])
const {showCompleted} = args
const completedFilter = (typeof showCompleted === 'boolean') ? { completed: showCompleted } : {}
const jobIDS = await context.db.query.jobs({ where: completedFilter }, `{ id }`)
//console.log(jobIDS);
let jobs = await context.db.query.jobs({
where: completedFilter
}, info)
return await getAllJobCostsToDateList(jobs)
}
I am applying the the fragmentReplacements as per below.
const fragmentReplacements = extractFragmentReplacements(resolvers)
console.log(fragmentReplacements)
const port = process.env.PORT || 3010
const graphQLServer = new GraphQLServer({
typeDefs: './src/schema.graphql',
resolvers,
resolverValidationOptions: {
requireResolversForResolveType: false
},
context: req => ({
...req,
db: new Prisma({
typeDefs: `src/generated/prisma.graphql`,
fragmentReplacements,
endpoint: PRISMA_ENDPOINT,
secret: PRISMA_KEY,
debug: false
})
})
})
If i console.log the fragmentReplacements object i get the following, so it does seem to be picking up the fragments.
[ { field: 'job', fragment: 'fragment costsToDate on Job { id }' },
{ field: 'jobs',
fragment: 'fragment costsToDate on Jobs { id }' } ]
So my expectation here is that if i make a query against jobs or job that asks for the costsToDate field that it will also fetch the id for the job/each job.
However if i make the following query.
query{
jobs{
description
costsToDate
}
}
But i see no id fetched, and nothing in the root parameter on the resolver function.
Apologies as i am probably barking up completely the wrong tree here, seems like a somewhat simple requirement, but i can't quite work it out. Sure i'm missing something fundamental.
Thanks!
Gareth

Answer 1

A fragment is used to always retrieve given fields on a given type.
It follows the following format:
fragment NameOfYourFragment on YourType { ... }
You currently can't apply a given fragment conditionally as it is always applied.
Moreover, you specified a fragment on Jobs, but the type name used by Prisma is Job (even if you have the job and jobs resolvers)
You probably only need the following resolver:
const job = {
fragment: `fragment JobId on Job { id }`,
resolve: jobsResolver
}