hcengineering/platform · error · Error

sequence object not found

Error message

sequence object not found

What it means

Thrown in CreateApplication.svelte when the Sequence object for recruit.class.Applicant is missing. Sequences supply incrementing application numbers; without the sequence document the code cannot allocate a number and aborts creation.

Source

Thrown at plugins/recruit-resources/src/components/CreateApplication.svelte:123

    isDone: false
  }

  const dispatch = createEventDispatcher()
  const client = getClient()
  const hierarchy = client.getHierarchy()
  fillDefaults(hierarchy, doc, recruit.class.Applicant)

  export function canClose (): boolean {
    return (preserveCandidate || _candidate === undefined) && assignee === undefined
  }

  async function createApplication (): Promise<void> {
    if (selectedState === undefined) {
      throw new Error(`Please select initial state:${_space}`)
    }
    const sequence = await client.findOne(core.class.Sequence, { attachedTo: recruit.class.Applicant })
    if (sequence === undefined) {
      throw new Error('sequence object not found')
    }
    if (kind === undefined) {
      throw new Error('kind is not specified')
    }

    const incResult = await client.update(sequence, { $inc: { sequence: 1 } }, true)

    const candidateInstance = await client.findOne(contact.class.Person, { _id: _candidate })
    if (candidateInstance === undefined) {
      throw new Error('contact not found')
    }

    const ops = client.apply(undefined, recruitId + '.Create.CreateApplication')

    if (!client.getHierarchy().hasMixin(candidateInstance, recruit.mixin.Candidate)) {
      await ops.createMixin<Contact, Candidate>(
        candidateInstance._id,
        candidateInstance._class,

View on GitHub (pinned to 63e28dc964)

Solutions

1. Run workspace migrations/seed so the Applicant sequence object is created
2. Re-create the sequence manually with attachedTo: recruit.class.Applicant
3. Verify with a query that core.class.Sequence attachedTo=Applicant exists before opening the dialog
4. Catch the error and trigger sequence seeding then retry

Example fix

// before
const sequence = await client.findOne(core.class.Sequence, { attachedTo: recruit.class.Applicant })
if (sequence === undefined) {
  throw new Error('sequence object not found')
}
// after
let sequence = await client.findOne(core.class.Sequence, { attachedTo: recruit.class.Applicant })
if (sequence === undefined) {
  sequence = await client.createDoc(core.class.Sequence, core.space.Model, {
    attachedTo: recruit.class.Applicant, sequence: 0
  })
}

const sequence = await client.findOne(core.class.Sequence, { attachedTo: recruit.class.Applicant })
if (sequence === undefined) {
  await ensureSequence(recruit.class.Applicant, 0)
}

function hasSequence (s: Sequence | undefined): s is Sequence {
  return s !== undefined
}

try {
  await createApplication()
} catch (err) {
  if (err instanceof Error && err.message === 'sequence object not found') {
    await seedSequences()
    return createApplication()
  }
  throw err
}

When it happens

Trigger: client.findOne(core.class.Sequence, { attachedTo: recruit.class.Applicant }) returns undefined because the sequence was never seeded, was deleted, or migrations have not run for the workspace.

Common situations: Fresh or partially-migrated recruit plugin workspace; sequence object removed by cleanup tooling; data restore that skipped sequence documents.

Related errors

• sequence object not found
• update is null
• Can only move accounts from mongodb for now
• Invalid region passed to migrate operation
• Add collection step must have attachedTo, attachedToClass, c

AI-assisted analysis of hcengineering/platform@63e28dc964 (2026-08-29). Data as JSON: /api/errors/243f5313852e5c82. Report an issue: GitHub.