Using the serializer successfully with my data model, but I was wondering if there's a simple way to get it to filter out "null" items when serializing models or dictionaries?

My data is pulled from Postgresql, and as I'm feeding much of it to SOLR for indexing purposes, I'd like to reduce the document size and eliminate unneeded elements from the JSON output. If there's already an option in the Serializer I'm missing or an easy way to accomplish this via the model, I'd appreciate a pointer.

Thanks in advance.