mongoose aggregate match array
Any valid expression that resolves to an array. Unlike the $in query operator, the aggregation $in operator does not support matching by regular expressions ... ,Because $match limits the total number of documents in the aggregation pipeline, earlier $match operations minimize the amount of processing down the pipe. If ... ,If you want use aggregation framework and use $match to match elements by _id ... Don't know if this could be the way that mongoose could do it (sincerely ... in)) // Is an array of strings similar to ObjectId // or an string similar to ObjectId let&,[pipeline] «Array» aggregation pipeline as an array of objects ... Do this instead to cast to an ObjectId new Aggregate([ $match: _id: mongoose.Types. ,2018年10月23日 — Use $unwind to transform each document with arrays to array of documents with nested fields. In your example, like this: profiles.aggregate([ ... ,2019年2月24日 — Try with $eleMatch db.restaurants.aggregate([$match: "grades": $elemMatch: "score": $gt:5}}}}}]). ,2015年7月5日 — A slight variation based on @chridam's answer: db.test.aggregate([ "$unwind": "$array" }, "$group": _id: "_id": "$_id", "value": "$value" } ... ,As @profesor79 said, you just have to $match for the userid you are interested in: $match: "friends": "user_id_to_find")}. Unless I don't understand the question, ... ,2016年6月13日 — To return all posts created by users depicted in a list of ids, use the $in operator in your query and then chain the sort() method to the query to ... ,Try the following aggregate query: db.wisata.aggregate([ "$match": "lokasi.prov": "Yogyakarta"}}, "$group": "_id": "$lokasi.kota"}}, "$unwind": "$_id"} ]).
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 mongoose aggregate match array 相關參考資料
$in (aggregation) — MongoDB Manual
Any valid expression that resolves to an array. Unlike the $in query operator, the aggregation $in operator does not support matching by regular expressions ... https://docs.mongodb.com $match (aggregation) — MongoDB Manual
Because $match limits the total number of documents in the aggregation pipeline, earlier $match operations minimize the amount of processing down the pipe. If ... https://docs.mongodb.com aggregate $match to match by _id, values must be cast to ...
If you want use aggregation framework and use $match to match elements by _id ... Don't know if this could be the way that mongoose could do it (sincerely ... in)) // Is an array of strings simil... https://github.com Aggregate - Mongoose
[pipeline] «Array» aggregation pipeline as an array of objects ... Do this instead to cast to an ObjectId new Aggregate([ $match: _id: mongoose.Types. https://mongoosejs.com MongoDB aggregate + $match + $group + Array - Stack ...
2018年10月23日 — Use $unwind to transform each document with arrays to array of documents with nested fields. In your example, like this: profiles.aggregate([ ... https://stackoverflow.com Mongodb aggregate match value in array - Stack Overflow
2019年2月24日 — Try with $eleMatch db.restaurants.aggregate([$match: "grades": $elemMatch: "score": $gt:5}}}}}]). https://stackoverflow.com MongoDB Aggregation - match if value in array - Stack Overflow
2015年7月5日 — A slight variation based on @chridam's answer: db.test.aggregate([ "$unwind": "$array" }, "$group": _id: "_id": "$_id", "val... https://stackoverflow.com Mongoose aggregate match if in array - Stack Overflow
As @profesor79 said, you just have to $match for the userid you are interested in: $match: "friends": "user_id_to_find")}. Unless I don't understand the question, ... https://stackoverflow.com Mongoose Aggregation match an array of objectIds - Stack ...
2016年6月13日 — To return all posts created by users depicted in a list of ids, use the $in operator in your query and then chain the sort() method to the query to ... https://stackoverflow.com Query MongoDB to match and group nested array - Stack ...
Try the following aggregate query: db.wisata.aggregate([ "$match": "lokasi.prov": "Yogyakarta"}}, "$group": "_id": "$lokasi.kota"}}, "$... https://stackoverflow.com |