Dereferencing abstract documents correctly from reference fields and from_son#1801

Open

mmoonport wants to merge 5 commits intoMongoEngine:masterfrom

mmoonport:master

Commits on Jun 7, 2018

Added DBRef cls checks for abstract document dereferencing
Matthew Moon
committed
fixed code format issues
Matthew Moon
committed
fixed code format issues
Matthew Moon
committed

Commits on Sep 1, 2018

updates to dereference to fix abstract document dereference
Matthew Moon
committed
fixes for abstract document dereferencing
Matthew Moon
committed