Django unique=True not working

Question

This is from django\'s documentation:

Field.unique

If True, this field must be unique throughout the table.

This is enforced at the databas

Answer 1

Running sql scripts directly on the db can be avoided. Rather add the sql execution in your migration:

from __future__ import unicode_literals
from django.db import migrations, connection


def alter_table(apps, schema_editor):
    query ="ALTER TABLE  ADD UNIQUE (unique_col);"
    cursor = connection.cursor()
    cursor.execute(query)
    cursor.close()

class Migration(migrations.Migration):

    dependencies = [
        ('app', 'yourlastmigration'),
    ]

    operations = [        
        migrations.RunPython(alter_table),
    ]