if type is None it will be propigated from a ForeignKey
if type is None it will be propigated from a ForeignKey

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