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	models: Fix incorrect on_delete=CASCADE values for deleted streams.
In theory, we never delete streams, but if we did delete the notifications stream for a realm, we certainly shouldn't delete the realm.
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								zerver/migrations/0324_fix_deletion_cascade_behavior.py
									
									
									
									
									
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										56
									
								
								zerver/migrations/0324_fix_deletion_cascade_behavior.py
									
									
									
									
									
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							@@ -0,0 +1,56 @@
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# Generated by Django 3.2 on 2021-05-07 01:00
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import django.db.models.deletion
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from django.db import migrations, models
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class Migration(migrations.Migration):
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    dependencies = [
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        ("zerver", "0323_show_starred_message_counts"),
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    ]
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    operations = [
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        migrations.AlterField(
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            model_name="realm",
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            name="notifications_stream",
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            field=models.ForeignKey(
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                blank=True,
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                null=True,
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                on_delete=django.db.models.deletion.SET_NULL,
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                related_name="+",
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                to="zerver.stream",
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            ),
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        ),
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        migrations.AlterField(
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            model_name="realm",
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            name="signup_notifications_stream",
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            field=models.ForeignKey(
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                blank=True,
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                null=True,
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                on_delete=django.db.models.deletion.SET_NULL,
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                related_name="+",
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                to="zerver.stream",
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            ),
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        ),
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        migrations.AlterField(
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            model_name="userprofile",
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            name="default_events_register_stream",
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            field=models.ForeignKey(
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                null=True,
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                on_delete=django.db.models.deletion.SET_NULL,
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                related_name="+",
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                to="zerver.stream",
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            ),
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        ),
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        migrations.AlterField(
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            model_name="userprofile",
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            name="default_sending_stream",
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            field=models.ForeignKey(
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                null=True,
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                on_delete=django.db.models.deletion.SET_NULL,
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                related_name="+",
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                to="zerver.stream",
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            ),
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        ),
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    ]
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@@ -375,14 +375,14 @@ class Realm(models.Model):
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        related_name="+",
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        null=True,
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        blank=True,
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        on_delete=CASCADE,
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        on_delete=models.SET_NULL,
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    )
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    signup_notifications_stream: Optional["Stream"] = models.ForeignKey(
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        "Stream",
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        related_name="+",
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        null=True,
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        blank=True,
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        on_delete=CASCADE,
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        on_delete=models.SET_NULL,
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    )
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    MESSAGE_RETENTION_SPECIAL_VALUES_MAP = {
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@@ -1266,13 +1266,13 @@ class UserProfile(AbstractBaseUser, PermissionsMixin):
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        "zerver.Stream",
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        null=True,
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        related_name="+",
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        on_delete=CASCADE,
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        on_delete=models.SET_NULL,
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    )
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    default_events_register_stream: Optional["Stream"] = models.ForeignKey(
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        "zerver.Stream",
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        null=True,
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        related_name="+",
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        on_delete=CASCADE,
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        on_delete=models.SET_NULL,
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    )
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    default_all_public_streams: bool = models.BooleanField(default=False)
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