boards/migrations/0010_auto_20150208_1451.py

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

from django.db import models, migrations


class Migration(migrations.Migration):

    def clean_duplicate_tags(apps, schema_editor):
        Tag = apps.get_model('boards', 'Tag')
        for tag in Tag.objects.all():
            tags_with_same_name = Tag.objects.filter(name=tag.name).all()
            if len(tags_with_same_name) > 1:
                for tag_duplicate in tags_with_same_name[1:]:
                    threads = tag_duplicate.thread_set.all()
                    for thread in threads:
                        thread.tags.add(tag)
                    tag_duplicate.delete()

    dependencies = [
        ('boards', '0009_post_thread'),
    ]

    operations = [
        migrations.AlterField(
            model_name='post',
            name='thread',
            field=models.ForeignKey(on_delete=models.CASCADE, to='boards.Thread', related_name='pt+'),
            preserve_default=True,
        ),
        migrations.RunPython(clean_duplicate_tags),
        migrations.AlterField(
            model_name='tag',
            name='name',
            field=models.CharField(db_index=True, unique=True, max_length=100),
            preserve_default=True,
        ),
        migrations.AlterField(
            model_name='tag',
            name='required',
            field=models.BooleanField(db_index=True, default=False),
            preserve_default=True,
        ),
    ]