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32a5c422e9
This prep commit moves the 'rename_indexes_constraints' function to 'lib/migrate' as we're going to re-use it for the 'UserHotspot' to 'OnboardingStep' table rename operation. In general, this function would be helpful in migrations involving table rename operations, subject to the caution mentioned in the function via comments.
99 lines
3.6 KiB
Python
99 lines
3.6 KiB
Python
import django.db.models.deletion
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import django.utils.timezone
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from django.conf import settings
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from django.db import migrations, models
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from zerver.lib.migrate import rename_indexes_constraints
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class Migration(migrations.Migration):
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"""
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First step of migrating to a new UserPresence data model. Creates a new
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table with the intended fields, into which in the next step
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data can be ported over from the current UserPresence model.
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In the last step, the old model will be replaced with the new one.
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"""
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dependencies = [
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("zerver", "0442_remove_realmfilter_url_format_string"),
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]
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operations = [
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# Django doesn't rename indexes and constraints when renaming
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# a table (https://code.djangoproject.com/ticket/23577). This
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# means that after renaming UserPresence->UserPresenceOld the
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# UserPresenceOld indexes/constraints retain their old name
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# causing a conflict when CreateModel tries to create them for
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# the new UserPresence table.
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migrations.SeparateDatabaseAndState(
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database_operations=[
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migrations.RunPython(
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rename_indexes_constraints("zerver_userpresence", "zerver_userpresenceold"),
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reverse_code=rename_indexes_constraints(
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"zerver_userpresenceold", "zerver_userpresence"
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),
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)
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],
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state_operations=[
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migrations.RenameModel(
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old_name="UserPresence",
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new_name="UserPresenceOld",
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),
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migrations.RenameIndex(
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model_name="userpresenceold",
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old_name="zerver_userpresence_realm_id_timestamp_25f410da_idx",
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new_name="zerver_userpresenceold_realm_id_timestamp_52ef5fd3_idx",
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),
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],
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),
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migrations.CreateModel(
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name="UserPresence",
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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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(
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"last_connected_time",
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models.DateTimeField(
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db_index=True, default=django.utils.timezone.now, null=True
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),
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),
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(
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"last_active_time",
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models.DateTimeField(
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db_index=True, default=django.utils.timezone.now, null=True
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),
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),
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(
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"realm",
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models.ForeignKey(
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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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"user_profile",
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models.OneToOneField(
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on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL
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),
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),
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],
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),
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migrations.AddIndex(
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model_name="userpresence",
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index=models.Index(
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fields=["realm", "last_active_time"],
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name="zerver_userpresence_realm_id_last_active_time_1c5aa9a2_idx",
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),
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),
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migrations.AddIndex(
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model_name="userpresence",
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index=models.Index(
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fields=["realm", "last_connected_time"],
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name="zerver_userpresence_realm_id_last_connected_time_98d2fc9f_idx",
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),
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),
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]
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