Java driver - updating a field with a Map or an enum

[Paul Gifford]

Hi,
 
  I'm using Java driver 3.1.0.  I have a document with a field ("myMapField") that is populated with a Map<String, Object>.  I am able to insert the document (as a Document) but I can't update the field.  Here's how I'm trying to update the field:

myCollection.updateOne(filter, set("myMapField", myMap));

  I get the following exception:

org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class java.util.HashMap.
    at org.bson.codecs.configuration.CodecCache.getOrThrow(CodecCache.java:46) ~[bson-3.1.0.jar:na]

  Looking at the source code I see why I'm able to insert but not update: org.bson.codecs.DocumentCodec encodes a Map by iterating over the EntrySet, writing each value individually.  com.mongodb.client.model.BuildersHelper takes a different approach and looks in the registry for the class, hence the exception.  The same thing happens with enums - I can insert an enum but can't update a field with an enum.

  Is there some reason updates are different than inserts?  BuildersHelper is final so it can't be extended, though there's probably no way to insert a custom BuildersHelper anyway.  It would really be helpful if BuildersHelper took the same approach as DocumentCodec when encoding values.

Paul



 

[Ross Lawley]

Hi,

This is a because the Updates.Set helper doesn't support complex data types - see JAVA-2056 so it fails to convert to it correctly.

If you try without the helper it should work as expected eg:

myCollection.updateOne(filter, new Document("$set", new Document("myMapField", myMap)));

Hope that helps,

Ross

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{ name     : "Ross Lawley",
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