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This will allow us to rely on the database to detect duplicate `UserTopic`s (with the same `topic_name` with different cases) and thus correctly throw IntegrityErrors when expected. This is also important from a correctness point of view, since as of now, when checking if topic is muted or requesting the backend for muting a topic, the frontend does not check for case insensitivity. There might exist duplicate UserTopics (in a case insensitive sense) which need are removed before creating the new index. The migration was tested manually using `./manage.py shell`.
33 lines
1.0 KiB
Python
33 lines
1.0 KiB
Python
# Generated by Django 4.1.6 on 2023-02-11 05:16
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import django.db.models.functions.text
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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", "0428_remove_realm_email_address_visibility"),
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]
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operations = [
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migrations.AlterUniqueTogether(
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name="usertopic",
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unique_together=set(),
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),
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# Before adding the constraint, remove any pre-existing duplicates from the table
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migrations.RunSQL(
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"""
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DELETE FROM zerver_usertopic WHERE id NOT IN (SELECT max(id) FROM zerver_usertopic GROUP BY (user_profile_id, stream_id, upper(topic_name::text)));
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"""
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),
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migrations.AddConstraint(
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model_name="usertopic",
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constraint=models.UniqueConstraint(
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models.F("user_profile"),
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models.F("stream"),
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django.db.models.functions.text.Lower("topic_name"),
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name="usertopic_case_insensitive_topic_uniq",
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),
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),
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]
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