forked from mirrors/bookwyrm
49 lines
1.7 KiB
Python
49 lines
1.7 KiB
Python
# Generated by Django 3.0.7 on 2021-02-25 18:36
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from django.db import migrations, models
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from django.db import connection
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from django.db.models import Q
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import django.db.models.deletion
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from psycopg2.extras import execute_values
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def convert_review_rating(app_registry, schema_editor):
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''' take rating type Reviews and convert them to ReviewRatings '''
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db_alias = schema_editor.connection.alias
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reviews = app_registry.get_model(
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'bookwyrm', 'Review'
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).objects.using(db_alias).filter(
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Q(content__isnull=True) | Q(content='')
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)
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with connection.cursor() as cursor:
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values = [(r.id,) for r in reviews]
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execute_values(cursor, '''
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INSERT INTO bookwyrm_reviewrating(review_ptr_id)
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VALUES %s''', values)
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def unconvert_review_rating(app_registry, schema_editor):
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''' undo the conversion from ratings back to reviews'''
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# All we need to do to revert this is drop the table, which Django will do
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# on its own, as long as we have a valid reverse function. So, this is a
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# no-op function so Django will do its thing
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class Migration(migrations.Migration):
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dependencies = [
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('bookwyrm', '0045_auto_20210210_2114'),
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]
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operations = [
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migrations.CreateModel(
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name='ReviewRating',
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fields=[
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('review_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='bookwyrm.Review')),
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],
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options={
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'abstract': False,
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},
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bases=('bookwyrm.review',),
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),
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migrations.RunPython(convert_review_rating, unconvert_review_rating),
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]
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