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Code Issues Releases Wiki Activity

speed up the getArtists function with subquery join

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This commit is contained in:
Emory P 2014-02-02 03:42:45 -05:00
parent 1aa2a2c62b
commit 8570884e6e
1 changed files with 15 additions and 6 deletions
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17
api/browse.py
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@ -2,7 +2,7 @@
from flask import request
from web import app
from db import Folder, Artist, Album, Track, func
from db import Folder, Artist, Album, Track, func, session
from api import get_entity
import uuid, time, string
import os.path
@ -110,8 +110,13 @@ def show_directory():
def list_artists():
# According to the API page, there are no parameters?
indexes = {}
for artist in Artist.query.all():
# Optimized query instead of using backrefs, is there a way to speed up the backref?
c = session.query(Album.artist_id, func.count(Album.artist_id).label('c')).group_by(Album.artist_id).subquery(name='c')
for artist in session.query(Artist.name, Artist.id, c.c.c.label('albums')).join(c).order_by(Artist.name).all():
index = artist.name[0].upper() if artist.name else '?'
if index in map(str, xrange(10)):
index = '#'
elif index not in string.letters:
@ -126,8 +131,12 @@ def list_artists():
'artists': {
'index': [ {
'name': k,
'artist': [ a.as_subsonic_artist(request.user) for a in sorted(v, key = lambda a: a.name.lower()) ]
} for k, v in sorted(indexes.iteritems()) ]
'artist': [ {
'id': str(a.id),
'name': a.name,
'albumCount': a.albums
} for a in v ]
} for k, v in indexes.iteritems() ]
}
})