te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>node.js - Mongoose - How to read findOneAndUpdate result when includeResultMetadata flag is set? - Stack Overflow

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    I am using mongoose findOneAndUpdate (reference) query function with includeResultMetadata and lean flags set. It responds with object of type ModifyResult (reference) which looks like:

    { lastErrorObject:
   { n: 1,
     updatedExisting: false,
     upserted: 5e6a9e5ec6e44398ae2ac16a },
  value:
   { _id: 5e6a9e5ec6e44398ae2ac16a,
     name: 'Will Riker',
     __v: 0,
     age: 29 },
  ok: 1 }

    I am trying to parse the response and write below mentioned conditions:-

    1. No matching record found
    2. Matching record found but update failed
    3. Success and get updated record/document

    I am not able to write these conditions as I did not find the documentation much useful on how to read the response returned by database. Looking for some explanation around the response object.

    I am using mongoose findOneAndUpdate (reference) query function with includeResultMetadata and lean flags set. It responds with object of type ModifyResult (reference) which looks like:

    { lastErrorObject:
   { n: 1,
     updatedExisting: false,
     upserted: 5e6a9e5ec6e44398ae2ac16a },
  value:
   { _id: 5e6a9e5ec6e44398ae2ac16a,
     name: 'Will Riker',
     __v: 0,
     age: 29 },
  ok: 1 }

    I am trying to parse the response and write below mentioned conditions:-

    1. No matching record found
    2. Matching record found but update failed
    3. Success and get updated record/document

    I am not able to write these conditions as I did not find the documentation much useful on how to read the response returned by database. Looking for some explanation around the response object.

    • node.js
    • mongodb
    • mongoose
    Share Improve this question asked Feb 17 at 15:18 rajan_saini.98rajan_saini.98 1507 bronze badges
    Add a comment  | 

    1 Answer 1

    Reset to default 2

    You need to check lastErrorObject.n, lastErrorObject.updatedExisting, and value to determine the outcome.

    1. No matching record found (No document was found and no upsert happened)
    if (!result.value && !result.lastErrorObject.upserted) {
   console.log("No matching record found.");
}

    value is null, meaning no document was found. upserted is also undefined, meaning no new document was created.

    1. Matching record found but update failed. In most cases, if a document is found but not updated, it's likely because the update operation didn't modify any field.
    if (result.value && result.lastErrorObject.n === 1 && !result.lastErrorObject.updatedExisting) {
    console.log("Matching record found, but no update occurred.");
}

    value is not null, meaning a document was found. lastErrorObject.n === 1, meaning a document matched. updatedExisting === false, meaning the update didn't change anything.

    1. Success - Document was updated
    if (result.value && result.lastErrorObject.n === 1 && result.lastErrorObject.updatedExisting) {
    console.log("Success! The document was updated:", result.value);
}

    value is not null, meaning a document was found. updatedExisting === true, meaning an existing document was modified.

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