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0dca8f2a38
Migration plan: 1. Add NULLable .last_update_id column to UserPresence with default 0 for new objects. 2. Backfill the value to 0 for old UserPresences, can be done in the background while server is running. 3. Make the column non-NULL. 4. Add new model PresenceSequence and create its rows for old realms.
77 lines
2.4 KiB
Python
77 lines
2.4 KiB
Python
# Generated by Django 5.0.5 on 2024-05-02 22:36
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import django.db.models.deletion
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from django.db import migrations, models
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from django.db.backends.base.schema import BaseDatabaseSchemaEditor
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from django.db.migrations.state import StateApps
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def create_presence_sequence_for_old_realms(
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apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
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) -> None:
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Realm = apps.get_model("zerver", "Realm")
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PresenceSequence = apps.get_model("zerver", "PresenceSequence")
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max_id = Realm.objects.aggregate(models.Max("id"))["id__max"]
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if max_id is None:
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# Nothing to do if there are no rows yet.
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return
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BATCH_SIZE = 2000
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lower_bound = 0
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# Add a slop factor to make it likely we run past the end in case
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# of new rows created while we run. Races with realm creation are
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# pretty unlikely, and should throw an exception, so we should
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# catch them.
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max_id += BATCH_SIZE / 2
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while lower_bound < max_id:
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realm_ids = Realm.objects.filter(
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id__gt=lower_bound,
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id__lte=lower_bound + BATCH_SIZE,
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# Filter to realm whose PresenceSequence does not exist, to avoid
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# running into IntegrityError by trying to create duplicate PresenceSequence.
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presencesequence=None,
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).values_list("id", flat=True)
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PresenceSequence.objects.bulk_create(
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PresenceSequence(realm_id=realm_id, last_update_id=0) for realm_id in realm_ids
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)
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lower_bound += BATCH_SIZE
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class Migration(migrations.Migration):
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atomic = False
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dependencies = [
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("zerver", "0526_user_presence_backfill_last_update_id_to_0"),
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]
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operations = [
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migrations.CreateModel(
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name="PresenceSequence",
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fields=[
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(
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"id",
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models.AutoField(
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auto_created=True, primary_key=True, serialize=False, verbose_name="ID"
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),
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),
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("last_update_id", models.PositiveBigIntegerField()),
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(
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"realm",
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models.OneToOneField(
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on_delete=django.db.models.deletion.CASCADE, to="zerver.realm"
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),
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),
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],
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),
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migrations.RunPython(
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create_presence_sequence_for_old_realms,
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reverse_code=migrations.RunPython.noop,
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elidable=True,
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),
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]
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