boards/migrations/0014_auto_20150418_1749.py

# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.core.urlresolvers import reverse

from django.db import models, migrations


class Migration(migrations.Migration):

    def update_urls(apps, schema_editor):
        Post = apps.get_model('boards', 'Post')
        for post in Post.objects.all():
            thread = post.thread
            opening_id = Post.objects.filter(threads__in=[thread]).order_by('pub_time').first().id
            post_url = reverse('thread', kwargs={'post_id': opening_id})
            if post.id != opening_id:
                post_url += '#' + str(post.id)
            post.url = post_url
            post.save(update_fields=['url'])

    dependencies = [
        ('boards', '0013_auto_20150408_1210'),
    ]

    operations = [
        migrations.AddField(
            model_name='post',
            name='url',
            field=models.TextField(default=''),
            preserve_default=False,
        ),
        migrations.RunPython(update_urls),
    ]