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https://issues.apache.org/jira/browse/BEAM-6241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16725996#comment-16725996
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Ahmed El.Hussaini commented on BEAM-6241:
-----------------------------------------
[~iemejia] already did. This is the GitHub PR
[https://github.com/apache/beam/pull/7293.]
I totally agree about refactoring the query building part using a more
organized and generic way.
I’ve made a few changes to this class which I currently use internally and the
comment I left for myself is…
```
// Need a better way to build the cursor object
// Ugh, really Ugh!
```
I guess there’re two approaches here. One is to refactor the query building
piece using DBObjects.
The other is to use an external dependency ( ex:
https://github.com/MorphiaOrg/morphia ).
Here is what I can do. I'll open a new Ticket/PR to refactor the query building
piece and decouple that piece from the main Source and Sink API.
> MongoDbIO - Add Limit and Aggregates Support
> --------------------------------------------
>
> Key: BEAM-6241
> URL: https://issues.apache.org/jira/browse/BEAM-6241
> Project: Beam
> Issue Type: Improvement
> Components: io-java-mongodb
> Affects Versions: 2.9.0
> Reporter: Ahmed El.Hussaini
> Assignee: Jean-Baptiste Onofré
> Priority: Major
> Labels: easyfix
> Fix For: 2.10.0
>
>
> h2. Adds Support to Limit Results
>
> {code:java}
> MongoDbIO.read()
> .withUri("mongodb://localhost:" + port)
> .withDatabase(DATABASE)
> .withCollection(COLLECTION)
> .withFilter("{\"scientist\":\"Einstein\"}")
> .withLimit(5));{code}
> h2. Adds Support to Use Aggregates
>
> {code:java}
> List<BsonDocument> aggregates = new ArrayList<BsonDocument>();
> aggregates.add(
> new BsonDocument(
> "$match",
> new BsonDocument("country", new BsonDocument("$eq", new
> BsonString("England")))));
> PCollection<Document> output =
> pipeline.apply(
> MongoDbIO.read()
> .withUri("mongodb://localhost:" + port)
> .withDatabase(DATABASE)
> .withCollection(COLLECTION)
> .withAggregate(aggregates));
> {code}
>
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