added error handling for DB exceptions

condition.py

@@ -3,6 +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
 from status import st, Status
 
 ################################################################################
@@ -50,10 +51,15 @@ def new_condition():
         return render_template("edit_id_name.html", form=form, page_title='Create new Condition' )
     else:
         condition = Condition( name=request.form["name"] )
+        try:
             db.session.add(condition)
             db.session.commit()
             st.SetMessage( "Created new Condition (id={})".format(condition.id) )
             return redirect( '/conditions' )
+        except SQLAlchemyError as e:
+            st.SetAlert( "danger" )
+            st.SetMessage( "<b>Failed to add condition:</b>&nbsp;{}".format( e.orig) )
+            return render_template("edit_id_name.html", form=form, page_title='Create new Condition', alert=st.GetAlert(), message=st.GetMessage() )
 
 ################################################################################
 # /condition/<id> -> GET/POST(save or delete) -> shows/edits/delets a single condition
@@ -63,6 +69,7 @@ def condition(id):
     ### DDP: should this be request.form or request.values?
     form = ConditionForm(request.form)
     if request.method == 'POST' and form.validate():
+        try:
             condition = Condition.query.get(id)
             if 'delete' in request.form:
                 st.SetMessage("Successfully deleted (id={}, name={})".format( condition.id, condition.name ) )
@@ -72,6 +79,10 @@ def condition(id):
                 condition.name = request.form['name']
             db.session.commit()
             return redirect( '/conditions' )
+        except SQLAlchemyError as e:
+            st.SetAlert( "danger" )
+            st.SetMessage( "<b>Failed to modity condition:</b>&nbsp;{}".format(e.orig) )
+            return render_template("edit_id_name.html", form=form, page_title='Edit Condition', alert=st.GetAlert(), message=st.GetMessage() ) 
     else:
         condition = Condition.query.get(id)
         form = ConditionForm(request.values, obj=condition)