Smolder::DB::Preference
Class::DBI based model class for the 'preference' table in the database.
Each column in the borough table has a method with the same name that can be used as an accessor and mutator.
If this Preference is associated with a project,
then this will return that Smolder::DB::Project object,
else it will return undef.
Returns an arrayref of all acceptable values for the email_type field.
Returns an arrayref of all acceptable values for the email_freq field.
