Add Media Field for Album

[gcoppola19]

Fixes 6092

Add a media field for album, when a user runs beets fields, media will be listed for album. This way, media of album can be kept track of.

Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)
[x ] Tests.
test_media_field.py

[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[henry-oberholtzer]

Hi Grace! Thanks for the PR and your interest in contributing to Beets!

We currently have the media field provided by the Item class, which represents an individual song or track, which currently can be queried on an album level, and allows support for albums to have tracks from different media types (e.g. tracks from both CD and DVD ripped to digital file).

If there's a use case that isn't addressed by the current implementation, more context & background for the issues this addresses would be appreciated!

Thanks!

[endcredits33]

Hi @henry-oberholtzer, I created the original issue. The context here is when you run certain queries at album level, $media is not provided as it is not an album level field.

For example, running beet ls -af '$albumartist - $album ($media)' label:Nonplus gives:

Actress - Harrier ATTK / Gershwin ($media)
Actress - Machine And Voice ($media)
ASC - Nothing Is Certain ($media)
ASC - Nothing Is Certain LP Sampler ($media)
ASC - Porcelain / Focus Inwards ($media)
Barry Manalogue - Analogue / Koyo Front ($media)

[arsaboo]

@endcredits33 indeed, because media for an album does not always make sense. What would you expect if one of the tracks is vinyl and the other track is DVD-ripped?

[henry-oberholtzer]

@endcredits33 @gcoppola19 Ah, I see! I missed that.

I could see the album level query returning a list of the distinct media types from its tracks? I assume we never have albums without at least one Item.

[endcredits33]

@endcredits33 indeed, because media for an album does not always make sense. What would you expect if one of the tracks is vinyl and the other track is DVD-ripped?

Is this a common occurence? I think generally most releases tend to have a single media type. At the moment we're not displaying media at all for albums just because some releases may contain several types.

[henry-oberholtzer]

I think we need to be able to account for those instances, even if they're rare, and it should be possible to through DB queries.

[gcoppola19]

@henry-oberholtzer @endcredits33 Can I work on implementing this? Where for an album, it would list all media types of the songs in the album?

[arsaboo]

I don't see the value of doing this. Have you tried album_fields?

[endcredits33]

Couldn't we make the same argument about other fields, e.g label, genre, catalog number? These can vary across the same release (anecdotally more often than media) and yet they are included as album level fields.

[gcoppola19]

I wanted to implement it so that if a user wants to see the media types of songs in an album, it lists all the types, and made test cases to test if there was one media type, none, or multiple. Let me know if it needs any chances in functionality, I hope it's helpful!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.94%. Comparing base (2bd77b9) to head (401b51f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6152      +/-   ##
==========================================
+ Coverage   67.93%   67.94%   +0.01%     
==========================================
  Files         137      137              
  Lines       18677    18683       +6     
  Branches     3155     3157       +2     
==========================================
+ Hits        12688    12694       +6     
  Misses       5324     5324              
  Partials      665      665              

Files with missing lines	Coverage Δ
beets/library/models.py	87.20% <100.00%> (+0.02%)	⬆️
beetsplug/discogs.py	71.14% <100.00%> (+0.36%)	⬆️

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