TODO-2 completed, can remove a subbook from parent

main.py

@@ -352,7 +352,15 @@ def subbooks_for_book(id):
 ################################################################################
 @app.route("/remove_subbook", methods=["POST"])
 def remove_sub_book():
+    print("DDP: ADD SQL HERE TO DO THE DELETE - try/except")
+    try:
+        db.engine.execute("delete from book_sub_book_link where book_id = {} and sub_book_id = {}".format( request.form['rem_sub_parent_id'], request.form['rem_sub_sub_book_id']) )
+        db.session.commit()
         return redirect( '/book/{}'.format(request.form['rem_sub_parent_id']) )
+    except SQLAlchemyError as e:
+        st.SetAlert( "danger" )
+        st.SetMessage( e.orig )
+        return redirect( '/book/{}'.format(request.form['rem_sub_sub_book_id']) )
 
 ################################################################################
 # /book -> GET/POST -> creates a new book and when created, takes you back to
@@ -438,7 +446,6 @@ def book(id):
                     db.session.commit()
                 except SQLAlchemyError as e:
                     st.SetAlert( "danger" )
-                    print("actual sql alchemy error")
                     st.SetMessage( e.orig )
                     return redirect( '/book/{}'.format(id) )
                 except Exception as e: