re2o/users/migrations/0090_auto_20200418_0206.py

# -*- coding: utf-8 -*-
# Generated by Django 1.11.28 on 2020-04-18 00:06
from __future__ import unicode_literals

from django.db import migrations, models
from django.db.models import Count

class Migration(migrations.Migration):

    dependencies = [
        ('users', '0089_auto_20200418_0112'),
    ]


    def remove_double_email_accounts(apps, schema_editor):
        db_alias = schema_editor.connection.alias
        users = apps.get_model("users", "User")
        duplicates = users.objects.using(db_alias).values('email').annotate(email_count=Count('email')).filter(email_count__gt=1)
        for email_item in duplicates:
            duplicate_users = users.objects.using(db_alias).filter(email=email_item['email']).order_by('last_login', 'registered')
            for user in duplicate_users[1:]:
                user.email=None
                user.save()

    def revert_remove_double_email_accounts(apps, schema_editor):
        return

    operations = [
        migrations.RunPython(remove_double_email_accounts, revert_remove_double_email_accounts),
        migrations.AlterField(
            model_name='user',
            name='email',
            field=models.EmailField(blank=True, help_text='External email address allowing us to contact you.', max_length=254, null=True, unique=True),
        ),
    ]