jackwener/OpenCLI · error · CommandExecutionError

Nowcoder returned mismatched moment feed data

Error message

Nowcoder returned mismatched moment feed data

What it means

When a feed row declares contentType 74 (moment), projectFeedData requires momentData to be a record and contentData to be absent. This error means the row claims to be a moment but its payload shape says otherwise, so the library rejects it instead of projecting a broken moment post.

Source

Thrown at clis/nowcoder/posts.js:147

            throw new CommandExecutionError('Nowcoder returned mismatched content feed data');
        }
        const post = data.contentData;
        const id = requiredId(post.id, 'content id');
        if ((requireOuterId || data.contentId != null) && id !== requiredId(data.contentId, 'content feed id')) {
            throw new CommandExecutionError('Nowcoder returned mismatched content feed identity');
        }
        const uuid = requiredUuid(post.uuid, 'content uuid');
        return {
            ...commonFeedFields(data, post, 'content', post.authorId, post.createTime, index),
            id,
            uuid,
            entity_id: requiredId(post.entityId, 'content entity id'),
            url: `https://www.nowcoder.com/discuss/${id}`,
        };
    }
    if (data.contentType === MOMENT_TYPE) {
        if (!isRecord(data.momentData) || data.contentData != null) {
            throw new CommandExecutionError('Nowcoder returned mismatched moment feed data');
        }
        const post = data.momentData;
        const entityId = requiredId(post.id, 'moment entity id');
        if ((requireOuterId || data.contentId != null) && entityId !== requiredId(data.contentId, 'moment feed id')) {
            throw new CommandExecutionError('Nowcoder returned mismatched moment feed identity');
        }
        const uuid = requiredUuid(post.uuid, 'moment uuid');
        return {
            ...commonFeedFields(data, post, 'moment', post.userId, post.createdAt, index),
            id: uuid,
            uuid,
            entity_id: entityId,
            url: `https://www.nowcoder.com/feed/main/detail/${uuid}`,
        };
    }
    throw new CommandExecutionError(`Nowcoder returned unsupported feed contentType ${String(data.contentType)}`);
}

View on GitHub (pinned to 49907e53dc)

Solutions

  1. Inspect the row's momentData/contentData to confirm what Nowcoder actually returned for contentType 74.
  2. Pre-filter rows missing valid momentData before calling projectNowcoderFeed.
  3. If Nowcoder now sends both payloads, relax the projection guard to prefer momentData.
  4. Re-fetch the feed in case the row was a transient partial response.

Example fix

// before
const rows = projectNowcoderFeed(records, 10, 'recommend');
// after
const valid = records.filter((r) => r?.data?.contentType !== 74 || r?.data?.momentData != null);
const rows = projectNowcoderFeed(valid, 10, 'recommend');
Defensive patterns

Strategy: validation

Validate before calling

const isMomentRow = (d) => isRecord(d) && d.contentType === 74 && isRecord(d.momentData) && d.contentData == null;
const usable = records.filter((r) => { const d = wrapped ? r?.data : r; return d == null || isMomentRow(d) || d.contentType !== 74; });

Type guard

function isProjectableMomentRow(d) { return isRecord(d) && d.contentType === 74 && isRecord(d.momentData) && d.contentData == null; }

Try / catch

try {
    rows = projectNowcoderFeed(records, limit, source, wrapped);
} catch (error) {
    if (String(error.message).includes('mismatched moment feed data')) {
        console.error('Moment row payload missing or conflicting; inspect momentData');
    }
    throw error;
}

Prevention

When it happens

Trigger: A feed row with contentType===74 where momentData is null/not an object, or contentData is present alongside it.

Common situations: Deleted or restricted moments returning empty momentData while keeping the type marker; Nowcoder mixing content and moment payloads after a schema change; copy-pasted fixtures in tests with the wrong contentType; intermediate API versions returning both payloads.

Related errors

AI-assisted analysis of jackwener/OpenCLI@49907e53dc (2026-08-29). Data as JSON: /api/errors/71387dd9633693a2. Report an issue: GitHub.