PYTHON

django model query join

Blog.objects.filter(entry__headline__contains='Lennon').filter(entry__pub_date__year=2008)

How to JOIN three tables with Django ORM

queryset = Artist.objects.select_related(
    'songs', 'fans'
).filter(songs__title__icontains='love', fans__votes_casted__gte=100)

How to JOIN three tables with Django ORM

from django.db import models

class Artist(models.Model):
    name = models.CharField(max_length=60)
    year_established = models.SmallIntegerField()
    votes = models.IntegerField(blank=True, null=True)


class Song(models.Model):
    artist = models.ForeignKey(Artist, related_name='songs')
    title = models.CharField(max_length=5)
    votes = models.IntegerField()


class Fan(models.Model):
    artist = models.ForeignKey(Artist, related_name='fans')
    name = models.CharField(max_length=5)
    votes_casted = models.IntegerField()

join tables in django orm

class EventsMeetinglocation(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=100)
    address = models.CharField(max_length=200)

    class Meta:
        managed = True
        db_table = 'events_meetinglocation'

class EventsBoardmeeting(models.Model):
    id = models.IntegerField(primary_key=True)
    date = models.DateTimeField()
    agenda_id = models.IntegerField(blank=True, null=True)
    location_id = models.ForeignKey(EventsMeetinglocation)
    minutes_id = models.IntegerField(blank=True, null=True)

    class Meta:
       managed = True
       db_table = 'events_boardmeeting'

join tables in django orm

def meetings(request):
    meetingData = EventsBoardmeeting.objects.all()
    return render(request, 'board/meetings.html', {'data': meetingData })

join tables in django orm

{% for x in data %}
   {{ x.location_id.name }}
{% endfor %}