[英]MongoDb mongoose aggregatePagination returns multiple same documents over different pages
I am facing an issue with mongodb and mongoose with pagination.我正面临着 mongodb 和 mongoose 的分页问题。 I am trying to query over a set of Tutors and get those who are matching the query in a paginated and sorted (by updatedDate) result.我正在尝试查询一组导师,并在分页和排序(按更新日期)结果中获取与查询匹配的导师。 But the fact is I get multiple same documents over different pages ... I would like it to return a set of unique documents.但事实是我在不同的页面上得到多个相同的文档......我希望它返回一组独特的文档。 Here is part of my function (the rest is just to build the query from the request body):这是我的功能的一部分(其余部分只是从请求正文构建查询):
exports.search = (req, res) => {
var options = { page: page, limit: perPage, sortBy: { updatedDate: -1 }}
const aggregate = Tutor.aggregate([
{
"$geoNear":
{
"near":
{
"type": "Point",
"coordinates": [lon1, lat1]
},
"distanceField": "distance",
"spherical": true,
"maxDistance": radius
}
},
{
$match: match
}
]);
Tutor
.aggregatePaginate(aggregate, options, function (err, result, pageCount, count) {
if (err) {
return res.status(400).send(err);
}
else {
var opts = [
{ path: 'levels', select: 'name' },
{ path: 'subjects', select: 'name' },
{ path: 'assos', select: 'name' }
];
Tutor
.populate(result, opts)
.then(result2 => {
return res.send({
page: page,
perPage: perPage,
pageCount: pageCount,
documentCount: count,
tutors: result2
});
})
.catch(err => {
return res.status(400).send(err);
});
}
})
};
Now, imagine I am querying page 1 with a limit per page of 8. I 've got back my 8 documents correctly, all different.现在,假设我正在查询第 1 页,每页限制为 8。我已经正确取回了我的 8 个文档,所有文档都不同。 But when I am querying page 2, with the same limit per page, half of the documents were already returned in page 1 !但是当我查询第 2 页时,每页具有相同的限制,一半的文档已经在第 1 页中返回! Would you know why is that so ?你知道为什么会这样吗? Thank you !谢谢 !
EDIT编辑
I figured it was the sortBy that makes it happen.我认为是sortBy让它发生了。 If i remove it, everything works correctly.如果我删除它,一切正常。 I need it though ...虽然我需要它...
After doing alot of research.经过大量研究。 I found this solution.我找到了这个解决方案。 Hope it will solve your issue.希望它能解决你的问题。
Jobs.aggregatePaginate(aggregateQuery, { page: 1, limit: 10, sort: { 'createdAt': 'desc' } }, function (){});
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