private void FindAddedForeignKeys(
Tuple <IEntityType, IEntityType> tablePair,
IEnumerable <Tuple <IForeignKey, IForeignKey> > foreignKeyPairs)
{
_operations.AddRange(
tablePair.Item2.ForeignKeys
.Except(foreignKeyPairs.Select(pair => pair.Item2))
.Select(fk => OperationFactory.AddForeignKeyOperation(fk)));
}