Yes, that's exactly it, you can make arrays of the associated
subfields (alt, title, etc.), you just need to make sure they line up
- put in an empty value as you did for file_2, rather than omitting
the array value entirely. Note that the field handlers have some
smarts - if you pass a scalar rather than array to the subfields, that
value will be used for all files in the main array.
The source_dir applies whether the source field is populated
directly by your query or in prepareRow(), everything gets pulled
together at the prepare() stage.
Yes, set destination_file to preserve the full path.
You've got it!
Yes, that's exactly it, you can make arrays of the associated subfields (alt, title, etc.), you just need to make sure they line up - put in an empty value as you did for file_2, rather than omitting the array value entirely. Note that the field handlers have some smarts - if you pass a scalar rather than array to the subfields, that value will be used for all files in the main array.
The source_dir applies whether the source field is populated directly by your query or in prepareRow(), everything gets pulled together at the prepare() stage.
Yes, set destination_file to preserve the full path.