I am using Migrate Drupal-to-Drupal and migrating a D6 database to D7.
In D6, I have private and public files. They are in one field. In D7, I have a public file field and a private file field. Migrate d2d MigrateNode class puts the source file field info in the 'upload' field which can only be mapped to one destination field: public or private attachments.
My question is: Is there any way to conditionally check the value in the upload field in order to map the 'upload' to either the public or private field based upon that value?