# Generated by Django 3.1.5 on 2021-03-04 17:17
from django.apps.registry import Apps
from django.db import migrations, models
from django.db.backends.base.schema import BaseDatabaseSchemaEditor
from django.utils.text import slugify


def forwards(apps: Apps, schema_editor: BaseDatabaseSchemaEditor) -> None:
    Tag = apps.get_model("articles", "Tag")
    db_alias = schema_editor.connection.alias
    tags = Tag.objects.using(db_alias).all()
    for tag in tags:
        tag.slug = slugify(tag.name)
    Tag.objects.bulk_update(tags, ["slug"])


def backwards(apps: Apps, schema_editor: BaseDatabaseSchemaEditor) -> None:
    Tag = apps.get_model("articles", "Tag")
    db_alias = schema_editor.connection.alias
    Tag.objects.using(db_alias).update(slug="")


class Migration(migrations.Migration):

    dependencies = [
        ("articles", "0029_auto_20210303_1711"),
    ]

    operations = [
        migrations.AddField(
            model_name="tag",
            name="slug",
            field=models.CharField(blank=True, max_length=255),
        ),
        migrations.RunPython(forwards, backwards),
        migrations.AlterField(
            model_name="tag",
            name="slug",
            field=models.CharField(max_length=255, unique=True),
        ),
    ]