discogs: Fetch a few more metadata fields

[downinthings]

Hey Guys,

I've recently begun using the Discogs plugin for beets. I am wondering if the information obtained by the plugin could be extended? I am looking to get the following information for each release I tag:

Discogs URL
Release Date (YYYY-MM-DD)
Genre
Style
Country

I tried playing with the plugin to get this information, but I am not well-versed in python.

Having the ability to specify what tag fields this information is applied to would also be amazing.

Thanks guys!

[sampsyo]

Thanks for this idea! We do already appear to be fetching the country and release year, but the full date and genre/style would be cool to add. We also get the URL (as data_url) for display purposes but autotag.apply_metadata should probably store this in a flexattr.

[downinthings]

I've tried doing this myself, but I am unsure if what I have done is correct. Here is the code I changed / updated in the discogs.py file

def get_album_info(self, result):
        """Returns an AlbumInfo object for a discogs Release object.
        """
        album = re.sub(r' +', ' ', result.title)
        album_id = result.data['id']
        artist, artist_id = self.get_artist(result.data['artists'])
        # Use `.data` to access the tracklist directly instead of the convenient
        # `.tracklist` property, which will strip out useful artist information
        # and leave us with skeleton `Artist` objects that will each make an API
        # call just to get the same data back.
        tracks = self.get_tracks(result.data['tracklist'])
        albumtype = ', '.join(
            result.data['formats'][0].get('descriptions', [])) or None
        va = result.data['artists'][0]['name'].lower() == 'various'
        year = result.data['year']
        releasedate = result.data['released']
        genre = result.data['genres']
        style = result.data['styles']
        label = result.data['labels'][0]['name']
        mediums = len(set(t.medium for t in tracks))
        catalogno = result.data['labels'][0]['catno']
        if catalogno == 'none':
            catalogno = None
        country = result.data.get('country')
        media = result.data['formats'][0]['name']
        data_url = result.data['uri']
        return AlbumInfo(album, album_id, artist, artist_id, tracks, asin=None,
                         albumtype=albumtype, va=va, year=year, month=None,
                         day=None, label=label, mediums=mediums,
                         artist_sort=None, releasegroup_id=None,
                         catalognum=catalogno, script=None, language=None,
                         country=country, albumstatus=None, media=media,
                         albumdisambig=None, artist_credit=None,
                         original_year=None, original_month=None,
                         original_day=None, data_source='Discogs',
                         data_url=data_url, releasedate=releasedate, genre=genre, 
                         style=style)

I'm not sure how to apply this newly obtained data to tag fields... Also i'd love to be able to get the image from discogs as well. How would I go about doing that?

[sampsyo]

Looks cool! Would you mind opening a Pull Request for easy reviewing/merging?

Images will require a bit more effort, and probably collaboration with the fetchart plugin (see #429).

[downinthings]

I have no idea what I am doing with this so I'm not sure it's worth me opening a pull request. I don't know if what I wrote up there is correct or if it will break the plugin. I was hoping someone else would take the lead on this and I could pitch in some help if needed.

[sampsyo]

Well, opening a PR is free, and it's probably the best way to collaborate on this (we can run tests, add commits, etc. to iterate toward a final solution). This seems like a perfect start!

[gwern]

This looks interesting. How does the discogs genre metadata compare with the genre metadata being extracted from last.fm by lastgenre?

[sampsyo]

Good question, @gwern! It would be interesting to see a comparison between Last.fm data and Discogs data for a few representative examples.

[simonbcn]

Last.fm is useful for obtain genres with popular artist/albums. In other case, it's useless.
For example: https://www.discogs.com/es/S%C3%ADlvia-Comes-L%C3%ADdia-Pujol-Al-Entierro-De-Una-Hoja-Seca-Van-Dos-Caracoles/release/3705782 and http://www.last.fm/es/music/S%C3%ADlvia+Comes+&+L%C3%ADdia+Pujol/Al+Entierro+de+una+Hoja+Seca+Van+Dos+Caracoles
There is the album in Last.fm but without genres.

[SpaceAgeHero]

It would be good to fetch Discogs Release ID as well. It could be useful in case an "update tags" feature is planned.

[dbogdanov]

+1 on the idea to store Release ID. These identifiers are stable, so they are definitely worth storing, just like MBIDs.

[thedevilisinthedetails]

Is this still something that is pending development? Would love to also have the styles from discogs.

[dbogdanov]

I guess it is, but someone needs to help and add this functionality. Also, Discogs now provides composition identifiers that would be nice to add too, for example https://www.discogs.com/composition/0ad990be-3414-479f-8c9b-73ed43619781-The-Nine

[thedevilisinthedetails]

K, started looking into this and started some development. As I am new to python it may take some time.

[thedevilisinthedetails]

Will start working on this to retrieve and store additional discogs values for the attributes listed above.