A Quick Digression: Class::DBI::DataMigration::Mapping::HasAToHasA

• So far, we can only map scalar object attributes to other scalar object attributes
• Now we have a has-a relationship in the source and target databases
• Specialized class for this: Class::DBI::DataMigration::Mapping::HasAToHasA

• From the POD: "Map a single column in a single row that represents a has_a relatsionship from the source database to a single column in a single row that represents a has_a relationship in the target database."