Django plusieurs à plusieurs optimisation de filtrage

Question

Avez-vous une idée comment opitimize (temps) cette requête? Il est si lent, même si la population est d'environ 1000. wordpress

requête:

al = Wordpress.objects.all().order_by('?') 
zaplecza = Wordpress.objects.none() 
for l in labels.split(","): 
    zaplecza = zaplecza | al.filter(label = l)  
zaplecza = zaplecza.exclude(wordpress__url = project_name) <--very slow 

models.py

class Wordpress(models.Model): 
    url = models.CharField(max_length = 1000) 
    login = models.CharField(max_length = 1000, default = "admin") 
    password = models.CharField(max_length = 1000, default = "perkoz") 
    label = models.CharField(max_length = 1000) 
    cms = models.CharField(max_length = 1000) 


class Project(models.Model): 
    url = models.CharField(max_length = 1000) 
    links = models.TextField(blank = True, null = True, verbose_name = "Linki do wpisów") 
    wordpress = models.ManyToManyField(Wordpress, related_name = "wordpress", verbose_name = "Dodane do zaplecz") 

    main_link = models.CharField(max_length = 1000) 
    dir_links = models.TextField(blank = True, null = True, verbose_name="Anchory") 
    blog_links = models.TextField(blank = True, null = True, verbose_name="Lista linków i anchorów z ;;;") 
    category = models.ForeignKey(Category, related_name = "projekt") 
    kategorie = models.CharField(max_length = 1000) 
    labels = models.CharField(max_length = 1000) 
    tagi = models.CharField(max_length = 1000) 
    auto_tekst = models.BooleanField(verbose_name="Auto tekst") 
    arts = models.TextField(blank = True, null = True, verbose_name="Artykuły") 
    title = models.TextField(blank = True, null = True, verbose_name="Tytuł") 
    no = models.IntegerField(blank = True, null = True, verbose_name="Liczba wpisów") 
    last_added = models.DateTimeField(blank = True, null = True, verbose_name="Ostatnio dodane") 

Answer 1

Vous aller chercher des objets liés m2m, vous devez donc utiliser prefetch_related dans votre interroger pour l'optimiser.

https://docs.djangoproject.com/en/dev/ref/models/querysets/#django.db.models.query.QuerySet.prefetch_related