What causes "discussion receipt lookup failed" in affaan-m/ECC?

Verify the discussionId (node_id) is correct with a direct query: node(id:...) { ... on Discussion { id number } }

affaan-m/ECC · error · Error

discussion receipt lookup failed

Error message

discussion receipt lookup failed

What it means

findReceiptComment pages through a discussion's comments via GraphQL node(id) and throws this when `data.node?.comments` is missing. That means the node lookup returned null/undefined or lacked comments — typically because the discussionId is invalid, the token lacks read:discussion scope, or the node is not a Discussion the caller can see.

Solutions

Verify the discussionId (node_id) is correct with a direct query: node(id:...) { ... on Discussion { id number } }
Confirm the token has read:discussion scope for the repository
Log the raw GraphQL response (data and errors) to see whether node is null vs comments missing
Fall back to the REST API GET /repos/{owner}/{repo}/discussions/{number}/comments to cross-check

Example fix

// before
const comments = data.node?.comments;
if (!comments) throw new Error('discussion receipt lookup failed');
// after
if (!data.node) throw new Error(`discussion node ${discussionId} not found or not readable`);
const comments = data.node.comments;
if (!comments) throw new Error(`discussion ${discussionId} returned no comments field: ${JSON.stringify(data)}`);

Defensive patterns

Strategy: try-catch

Validate before calling

// verify the node resolves before paging comments
const probe = await githubGraphql('query($id:ID!){node(id:$id){id ... on Discussion{number}}}', { id: discussionId });
if (!probe.node) throw new Error(`Discussion node ${discussionId} not readable — check id and token scopes`);

Type guard

function isDiscussionComments(node) {
  return node != null && typeof node === 'object'
    && node.comments != null
    && Array.isArray(node.comments.nodes)
    && typeof node.comments.pageInfo?.hasNextPage === 'boolean';
}

Try / catch

try {
  const receipt = await findReceiptComment(discussionId, marker);
} catch (err) {
  if (err.message === 'discussion receipt lookup failed') {
    console.error(`Node ${discussionId} unreadable: check node_id validity and read:discussion scope`);
  }
  throw err;
}

Prevention

Persist the discussion node_id from the create mutation and reuse it unchanged
Grant read:discussion scope to the token
Include GraphQL error details in githubGraphql's thrown error to expose in-band failures
Cross-check with the REST endpoint /discussions/{number}/comments when in doubt

When it happens

Trigger: githubGraphql succeeded at the HTTP level but data.node is null (invalid node ID, insufficient permission) or node exists but `comments` field errored/was omitted, so the optional chain yields undefined.

Common situations: A discussion ID from another repository or a stale ID from deleted discussions; token missing the read:discussion scope so node(id) returns null; GitHub returning partial results with in-band errors silently swallowed by the payload.errors check upstream being bypassed is impossible — but a malformed alias/query would produce missing fields.

Understand the failure class

Background: "invalid response format", "malformed payload", "missing data field": when an API returns 200 but the response shape is wrong — this error's family across 23 libraries.

Related errors

AI-assisted analysis of affaan-m/ECC@8321021c54 (2026-09-16). Data as JSON: /api/errors/77b9e092ec9358aa. Report an issue: GitHub.

Appendix: source

Thrown at scripts/discord/release-announce.mjs:113

  if (!/^\d+$/.test(env.DISCUSSION_NUMBER || '')) throw new Error('discussion number is invalid');
  const response = await request(`https://api.github.com/repos/${env.GITHUB_REPOSITORY}/discussions/${env.DISCUSSION_NUMBER}`, {
    headers: { Authorization: `Bearer ${env.GITHUB_TOKEN}`, Accept: 'application/vnd.github+json' },
  });
  if (!response.ok) throw new Error(`discussion lookup failed (${response.status})`);
  const discussion = await response.json();
  if (discussion.category?.name !== 'Announcements') throw new Error('discussion is not an Announcement');
  return { id: discussion.node_id, title: discussion.title, body: discussion.body, url: discussion.html_url };
}

async function findReceiptComment(discussionId, marker) {
  let cursor = null;
  for (let page = 0; page < 50; page += 1) {
    const data = await githubGraphql(
      `query($id:ID!,$after:String){node(id:$id){... on Discussion{comments(first:100,after:$after){nodes{id body author{login}} pageInfo{hasNextPage endCursor}}}}}`,
      { id: discussionId, after: cursor },
    );
    const comments = data.node?.comments;
    if (!comments) throw new Error('discussion receipt lookup failed');
    const receipt = findDiscussionReceipt(comments.nodes, marker);
    if (receipt) return receipt;
    if (!comments.pageInfo.hasNextPage) return null;
    cursor = comments.pageInfo.endCursor;
  }
  throw new Error('discussion receipt lookup exceeded page budget');
}

async function addReceiptComment(discussionId, body) {
  const data = await githubGraphql(
    `mutation($id:ID!,$body:String!){addDiscussionComment(input:{discussionId:$id,body:$body}){comment{id}}}`,
    { id: discussionId, body },
  );
  return data.addDiscussionComment.comment.id;
}

async function deleteReceiptComment(commentId) {
  await githubGraphql(

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