moviewyrm/bookwyrm/migrations/0086_auto_20210828_1724.py

# Generated by Django 3.2.4 on 2021-08-28 17:24

import bookwyrm.models.fields
from django.conf import settings
from django.db import migrations, models
from django.db.models import F, Value, CharField
from django.db.models.functions import Concat


def forwards_func(apps, schema_editor):
    """generate followers url"""
    db_alias = schema_editor.connection.alias
    apps.get_model("bookwyrm", "User").objects.using(db_alias).annotate(
        generated_url=Concat(
            F("remote_id"), Value("/followers"), output_field=CharField()
        )
    ).update(followers_url=models.F("generated_url"))


def reverse_func(apps, schema_editor):
    """noop"""


class Migration(migrations.Migration):

    dependencies = [
        ("bookwyrm", "0085_user_saved_lists"),
    ]

    operations = [
        migrations.AddField(
            model_name="user",
            name="followers_url",
            field=bookwyrm.models.fields.CharField(
                default="/followers", max_length=255
            ),
            preserve_default=False,
        ),
        migrations.RunPython(forwards_func, reverse_func),
        migrations.AlterField(
            model_name="user",
            name="followers",
            field=models.ManyToManyField(
                related_name="following",
                through="bookwyrm.UserFollows",
                to=settings.AUTH_USER_MODEL,
            ),
        ),
    ]