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; } ?>How can I fetch a set of documents whose ids match an array of ids in node.js using firebase? - Stack Overflow

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    你的位置： 首页>programmer>How can I fetch a set of documents whose ids match an array of ids in node.js using firebase? - Stack Overflow

    How can I fetch a set of documents whose ids match an array of ids in node.js using firebase? - Stack Overflow

    programmeradmin4浏览0评论

    I'm working with Firebase Firestore and I have the following code to fetch a set of "lines":

    for (let i = 0; i < indexes.length; i++) {
    const doc = await lineCollection.doc(indexes[i]).get();
    lineData.push(doc.data());
}

    This seems like a really inefficient way to fetch the lines, especially when indexes is large. I'm wondering if there's a way in Firebase to fetch a set of documents in a collection given an array of ids (which is what indexes is).

    I tried the following and variants thereof:

    const docs = await lineCollection.where('id', 'in', indexes).get();

    const docs = await lineCollection.where(FieldPath.documentId(), 'in', indexes).get();

    But none of these work.

    I'm using firebase 9.16.0 and firebase-admin 11.5.0 in Node 18.19.0. Is there a way with these versions of firebase and Node to fetch a set of documents matching ids in a given array all in one call?

    I'm working with Firebase Firestore and I have the following code to fetch a set of "lines":

    for (let i = 0; i < indexes.length; i++) {
    const doc = await lineCollection.doc(indexes[i]).get();
    lineData.push(doc.data());
}

    This seems like a really inefficient way to fetch the lines, especially when indexes is large. I'm wondering if there's a way in Firebase to fetch a set of documents in a collection given an array of ids (which is what indexes is).

    I tried the following and variants thereof:

    const docs = await lineCollection.where('id', 'in', indexes).get();

    const docs = await lineCollection.where(FieldPath.documentId(), 'in', indexes).get();

    But none of these work.

    I'm using firebase 9.16.0 and firebase-admin 11.5.0 in Node 18.19.0. Is there a way with these versions of firebase and Node to fetch a set of documents matching ids in a given array all in one call?

    • node.js
    • firebase
    • google-cloud-firestore
    Share Improve this question edited Feb 18 at 4:35 Frank van Puffelen 599k85 gold badges889 silver badges859 bronze badges Recognized by Google Cloud Collective asked Feb 18 at 4:22 gib65gib65 2,0194 gold badges35 silver badges73 bronze badges 1
    • Answer below, but since you say you already tried FieldPath.documentId(), can you: 1) log indexes and show us the updated code and its output, 2) show a screenshot of one of the documents you expect to get back from this query (from the Firestore console). 3) How lineCollection is initialized. – Frank van Puffelen Commented Feb 18 at 4:34
    Add a comment  | 

    1 Answer 1

    Reset to default 2

    This query assumes that the documents have a field id with the value you want to filter on:

    lineCollection.where('id', 'in', indexes)

    But it seems that you actually want to filter on the document ID, not a custom id field. To filter on document ID, you can use:

    lineCollection.where('__name__', 'in', indexes)

    Or without the magic string using FieldPath.documentId():

    lineCollection.where(FieldPath.documentId(), 'in', indexes)

    Your data structure looks pretty unusual for a NoSQL database. More common would be to include the order lines in the order document and manipulate them in one go.

    If you're new to modeling data in a NoSQL database, I recommend reading NoSQL data modeling techniques and watching Get to know Cloud Firestore.

    If you maintain your current structure, I recommend including the order ID in each line document, so that you can get all lines for an order with:

    lineCollection.where('orderId', 'in', 'ID of the order you are loading')

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