Pagination error - Cannot read properties of undefined (reading 'fieldsByTypeName')

[tony-oldport]

I'm trying a fairly straightforward example with pagination, but am running into the following error: Cannot read properties of undefined (reading 'fieldsByTypeName')

It's failing on line 62 of graph.ts because in line 61 tree is being assigned to tree.fieldsByTypeName[type][field], but field has been set to "nodes" in cursor.ts line 112, and there are no fields named "nodes" on the entity so tree is assigned undefined.

I've tried instantiating CursorPaginator with no options, and with different take and fields options

If there is other useful information I can add here, please let me know.

  const resolveGraph = GraphResolver({
    Plan: ModelResolver(Plan)
  })
  const plans = await resolveGraph(context, info, Plan.query(), {
    paginate: CursorPaginator()
  })

'use strict'

const { Model } = require('objection')

class Plan extends Model {
  static get tableName () {
    return 'plans'
  }

  static get relationMappings () {
    return {
      services: {
        relation: Model.ManyToManyRelation,
        modelClass: require('./Service'),
        join: {
          from: 'plans.id',
          through: {
            from: 'plansServices.planId',
            to: 'plansServices.serviceId'
          },
          to: 'services.id'
        }
      }
    }
  }
}

module.exports = Plan

[IlyaSemenov]

Please paste your graphql schema and query.

[tony-oldport]

Ok, i've tried to simplify things a bit more by taking out the relation mappings (getting same result):

Schema:

type Plan {
  id: ID!
  name: String!
}

type Query {
  getPlansTest: [Plan]!
}

Query:

query getPlans {
  getPlansTest {
    id
    name
  }
}

Resolver:

'use strict'

const { GraphResolver, ModelResolver, CursorPaginator } = require('objection-graphql-resolver')
const Plan = require('../models/Plan')

async function getPlansTestResolver ({
  context,
  info
}) {
  const resolveGraph = GraphResolver({
    Plan: ModelResolver(Plan)
  })
  const plans = await resolveGraph(context, info, Plan.query(), {
    paginate: CursorPaginator()
  })
  return plans
}

module.exports = getPlansTestResolver

Model class:

'use strict'

const { Model } = require('objection')

class Plan extends Model {
  static get tableName () {
    return 'plans'
  }
}

module.exports = Plan

Full stack trace:

TypeError: Cannot read properties of undefined (reading 'fieldsByTypeName')
    at resolve_tree (/usr/app/node_modules/objection-graphql-resolver/src/resolver/graph.ts:62:30)
    at resolve (/usr/app/node_modules/objection-graphql-resolver/src/resolver/graph.ts:78:3)
    at getPlansTestResolver (/usr/app/server/resolvers/getPlansTestResolver.js:14:25)
    at execFn (/usr/app/server/utils/generateResolver.js:22:22)
    at /usr/app/server/utils/generateResolver.js:51:22
    at resolveField (/usr/app/node_modules/graphql/execution/execute.js:464:18)
    at executeFields (/usr/app/node_modules/graphql/execution/execute.js:292:18)
    at executeOperation (/usr/app/node_modules/graphql/execution/execute.js:236:122)
    at executeImpl (/usr/app/node_modules/graphql/execution/execute.js:116:14)
    at Object.execute (/usr/app/node_modules/graphql/execution/execute.js:60:63)
    at /usr/app/node_modules/graphql-tools/src/stitching/delegateToSchema.ts:105:13
    at step (/usr/app/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:32:23)
    at Object.next (/usr/app/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:13:53)
    at /usr/app/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/usr/app/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:3:12)

[IlyaSemenov]

As you're using pagination, you need to define a type for page (PlanPage) and query it accordingly. Please refer to the guide here https://github.com/IlyaSemenov/objection-graphql-resolver/blob/master/docs/pagination.md or read the theory here https://graphql.org/learn/pagination/ (I decided to ditch edges in favour of plain nodes for simplicity, but the concept is the same).