boards/migrations/0027_auto_20150912_1632.py

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import migrations


class Migration(migrations.Migration):

    def build_opening_flag(apps, schema_editor):
        Post = apps.get_model('boards', 'Post')
        for post in Post.objects.all():
            op = Post.objects.filter(threads__in=[post.thread]).order_by('pub_time').first()
            post.opening = op.id == post.id
            post.save(update_fields=['opening'])

    dependencies = [
        ('boards', '0026_post_opening'),
    ]

    operations = [
        migrations.RunPython(build_opening_flag),
    ]