Recent questions tagged Aggregation

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aggregation framework - Get array subset in mongodb using an array source

I have this document's structure: { Id: "id_value", Elements:[ { InnerId: "inner_id_value1", Value: "apple" } ... in Mongo with a single query? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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aggregation - Single Responsibility Principle in Clean Architecture, Aggregating UseCases in one UseCaseManager which can provide UseCase based on In & Out Object.

I want to implement Single Responsibility principle in my projects Domain layer (Clean MVVM). I've approx. ... i implement getUseCase method. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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aggregation framework - MongoDB $graphLookup get children all levels deep - nested result

As presented in https://www.slideshare.net/mongodb/webinar-working-with-graph-data-in-mongodb, slide 50 it is ... hierarchy, all levels deep? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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837 views

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aggregation framework - Unwind empty array in mongodb

This is very similar to this question, however, when using a similar approach, I keep getting a list of only the ... { console.dir(polls); }); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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364 views

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aggregation - How to use Aggregate function in R

can you help me please how to properly use aggregate function in R? I have data like this: SPORT FLOWS [1, ... answer which worked for me.. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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973 views

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aggregation framework - Get percentages with MongoDB aggregate $group

I'd like to get percentages from a group pipeline in a MongoDB aggregate. My data: { _id : 1, name : ' ... success. Could you please help me? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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536 views

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aggregation framework - In MongoDB search in an array and sort by number of matches

The question is the next one: Get documents with tags in list, ordered by total number of matches But they ... Framework, it's possible? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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432 views

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aggregation framework - Query performance issue for large nested data in mongodb

I'm trying to query results from a large dataset called 'tasks' containing 187297 documents which are nested into ... . What I am missing? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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650 views

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aggregation framework - Mongodb count distinct with multiple group fields

I have transaction table which is populated by holidays taken by the employees. I would need help on ... Any suggestion would be helpful See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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770 views

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aggregation framework - Recursive search on a collection in MongoDB

I have a list of documents in MongoDB with tree structure, where Model Tree Structures with Parent References ... aggregation query? Thank you See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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347 views

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aggregation - Access logger from Elasticsearch script

I use the scripts aggressively for scoring and aggregation. One thing i cant figure out is how to emit logs ... logs from my groovy script. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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310 views

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aggregation framework - MongoDB Document Re-shaping

This question comes out of (as mine usually do) perusing the questions asked on SO and as such, raising another ... how this could be achieved. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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416 views

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aggregation framework - MongoDB group by values in an array field

I have my asset documents in the below format. db.asset.find({}).limit(1).pretty() { "_id" : ObjectId( ... want to group the assets by folderId. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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aggregation framework - MongoDB aggregate by field exists

I have a hard time believing this question hasn't been asked and answered somewhere already, but I can't find any ... false, "count" : 2 } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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980 views

1 answer

aggregation framework - How to flatten a subdocument into root level in MongoDB?

For example, if I have a document like this { a: 1, subdoc: { b: 2, c: 3 } } How can I convert it into a format like ... ) { a: 1, b: 2, c: 3 } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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