import django.db.models.deletion
from django.db import migrations, models


class Migration(migrations.Migration):
    dependencies = [
        ("tasks", "0023_taskusersettings_default_group"),
    ]

    operations = [
        migrations.AddField(
            model_name="taskcolumn",
            name="parent",
            field=models.ForeignKey(
                blank=True,
                null=True,
                on_delete=django.db.models.deletion.CASCADE,
                related_name="subcolumns",
                to="tasks.taskcolumn",
                verbose_name="Родительская колонка",
            ),
        ),
        migrations.RemoveConstraint(
            model_name="taskcolumn",
            name="uniq_task_column_board_name",
        ),
        migrations.AddConstraint(
            model_name="taskcolumn",
            constraint=models.UniqueConstraint(
                condition=models.Q(("parent__isnull", True)),
                fields=("board", "name"),
                name="uniq_task_top_column_board_name",
            ),
        ),
        migrations.AddConstraint(
            model_name="taskcolumn",
            constraint=models.UniqueConstraint(
                condition=models.Q(("parent__isnull", False)),
                fields=("parent", "name"),
                name="uniq_task_subcolumn_parent_name",
            ),
        ),
    ]