starting on update/delete db error handling, but not working yet

series.py

@@ -83,7 +83,9 @@ def new_series():
 def series(id):
     ### DDP: should this be request.form or request.values?
     form = SeriesForm(request.form)
+    page_title='Edit Series'
     if request.method == 'POST' and form.validate():
+        try:
             series = Series.query.get(id)
             if 'delete' in request.form:
                 st.SetMessage("Successfully deleted (id={}, title={})".format( series.id, series.title ) )
@@ -96,10 +98,15 @@ def series(id):
                 series.note = request.form['note']
             db.session.commit()
             return redirect( '/seriess' )
+        except SQLAlchemyError as e:
+            print("series -- error!")
+            st.SetAlert( "danger" )
+            st.SetMessage( "<b>Failed to modify Series:</b>&nbsp;{}".format(e.orig) )
+            return render_template("edit_id_name.html", form=form, page_title=page_title, alert=st.GetAlert(), message=st.GetMessage() )
     else:
         series = Series.query.get(id)
         form = SeriesForm(request.values, obj=series)
-    return render_template("series.html", form=form, page_title='Edit Series' )
+    return render_template("series.html", form=form, page_title=page_title )
 
 ################################################################################
 # Gets the Series matching id from DB, helper func in jinja2 code to show books