added error handling for DB exceptions

rating.py

@@ -3,7 +3,7 @@ from flask import request, render_template, redirect
 from flask_wtf import FlaskForm
 from __main__ import db, app, ma
 from sqlalchemy import func, Sequence
-from sqlalchemy.exc import SQLAlchemyError, IntegrityError
+from sqlalchemy.exc import SQLAlchemyError
 from status import st, Status
 
 ################################################################################
@@ -54,7 +54,6 @@ def new_rating():
         try:
             db.session.add(rating)
             db.session.commit()
-            st.SetAlert( "success" )
             st.SetMessage( "Created new Rating (id={})".format(rating.id) )
             return redirect( '/ratings' )
         except SQLAlchemyError as e:
@@ -78,7 +77,6 @@ def rating(id):
             if 'submit' in request.form:
                 st.SetMessage("Successfully Updated Rating (id={})".format(id) )
                 rating.name = request.form['name']
-            db.session.flush()
             db.session.commit()
             return redirect( '/ratings' )
         except SQLAlchemyError as e: