There have been multiple requests, in the past, for the ability to use
plugin fields in inline fields. This has not previously been available.
From what I can tell, it was intentionally left unavailable due to
performance concerns.
The way the item fields are made available to the inline python code
means that all fields are looked up, whether they're actually used by
the code or not. Doing that for all computed fields would be a
performance concern.
I don't believe there's a good way to postpone the field computation, as
python eval and compile requires that globals be a dictionary, not a
mapping. Instead, we can make available the album or item model object
to the code directly, and let the code access the fields it needs via
that object, resulting in postponing the computation of the fields until
they're actually accessed.
This is a simple approach that makes the computed and plugin fields
available to inline python, which allows for more code reuse, as well as
more options for shifting logic out of templates and into python code.
The object is available as `db_obj`.
Examples:
item_fields:
test_file_size: db_obj.filesize
album_fields:
test_album_path: db_obj.path
# If the missing plugin is enabled
test_album_missing: db_obj.missing
Signed-off-by: Christopher Larson <kergoth@gmail.com>
