begin to reflact using SQLAlchemy
finish the reflact of site controller
comtinue to reflact with SQLAlchemy
nearly finish reflactoring the sign contrller
finish reflaction of sign and topic controller
begin to reflact user controller howerev not finish
continue to reflact on work controller
nearly finish
I think I have finish the reflaction using SQLAlchemy
update config, ReadMe, link for github
fix a bug in authors
delete collect_work/collect_work_image by cascade when work/work_image is deleted
fix a bug in work switch in author page
display author name in title in author page
fix a bug in works page
do not display draft in all_work_reviews
update readme