0038_auto_20221122_0522.py

# Generated by Django 4.1.1 on 2022-11-22 05:22

from django.db import migrations, connection, transaction


def populate_concept_descriptions(apps, schema_editor):
    import time
    start = time.time()
    """
    1. Populates new concept_descriptions table from localized_texts table using many-to-many concepts_descriptions.
    2. Count of concepts_descriptions (old) and concept_descriptions (new) should be same after this migration.
    """

    def get_statement():
       return "insert into concept_descriptions(concept_id, external_id, name, type, locale, locale_preferred, created_at) values "

    with connection.cursor() as cursor:
        cursor.execute("""select concept_id, localizedtext_id from concepts_descriptions;""")
        rows = cursor.fetchall()

        statement = get_statement()
        count = 0
        for row in rows:
            cursor.execute(
                "select external_id, name, type, locale, locale_preferred, created_at from localized_texts where id = %s",
                [row[1]]
            )
            locale = cursor.fetchone()
            name = locale[1].replace("'", "''")
            statement += f"({row[0]}, '{locale[0]}', '{name}', '{locale[2]}', '{locale[3]}', {locale[4]}, '{locale[5]}'),"
            count += 1
            if count == 10000:
                if statement.endswith(','):
                    statement = statement[:-1] + ';'
                print(f"Inserting {count}...")
                cursor.execute(statement)
                statement = get_statement()
                count = 0

        if count > 0:
            if statement.endswith(','):
                statement = statement[:-1] + ';'

            print(f"Inserting Last {count}...")
            cursor.execute(statement)

    print('Time: ', time.time() - start)


class Migration(migrations.Migration):
    atomic = False

    dependencies = [
        ('concepts', '0037_localizedtext_concept'),
    ]

    operations = [
        migrations.RunPython(populate_concept_descriptions)
    ]