Changed mapper.get_session to compile mapper and thereby create the extension chain needed to lookup the current session.
Changed mapper.get_session to compile mapper and thereby create the
extension chain needed to lookup the current session.

olemis/sqlalchemy,Akrog/sqlalchemy,ThiefMaster/sqlalchemy,robin900/sqlalchemy,itkovian/sqlalchemy,wfxiang08/sqlalchemy,wujuguang/sqlalchemy,davidfraser/sqlalchemy,elelianghh/sqlalchemy,sqlalchemy/sqlalchemy,Cito/sqlalchemy,pdufour/sqlalchemy,bootandy/sqlalchemy,wujuguang/sqlalchemy,wfxiang08/sqlalchemy,bdupharm/sqlalchemy,WinterNis/sqlalchemy,epa/sqlalchemy,276361270/sqlalchemy,Cito/sqlalchemy,dstufft/sqlalchemy,EvaSDK/sqlalchemy,halfcrazy/sqlalchemy,davidjb/sqlalchemy,276361270/sqlalchemy,inspirehep/sqlalchemy,graingert/sqlalchemy,olemis/sqlalchemy,epa/sqlalchemy,alex/sqlalchemy,brianv0/sqlalchemy,hsum/sqlalchemy,Cito/sqlalchemy,WinterNis/sqlalchemy,sandan/sqlalchemy,pdufour/sqlalchemy,hsum/sqlalchemy,brianv0/sqlalchemy,davidfraser/sqlalchemy,Akrog/sqlalchemy,inspirehep/sqlalchemy,sandan/sqlalchemy,dstufft/sqlalchemy,itkovian/sqlalchemy,davidjb/sqlalchemy,alex/sqlalchemy,graingert/sqlalchemy,monetate/sqlalchemy,halfcrazy/sqlalchemy,zzzeek/sqlalchemy,monetate/sqlalchemy,j5int/sqlalchemy,elelianghh/sqlalchemy,alex/sqlalchemy,bootandy/sqlalchemy,bdupharm/sqlalchemy,ThiefMaster/sqlalchemy,j5int/sqlalchemy,EvaSDK/sqlalchemy,robin900/sqlalchemy