# Generated by Django 2.1 on 2018-08-18 17:57 from django.db import migrations def add_email(apps, schema_editor): Speaker = apps.get_model("program", "Speaker") SpeakerProposal = apps.get_model("program", "SpeakerProposal") for speaker in Speaker.objects.all(): if speaker.proposal and not speaker.email: speaker.email = speaker.proposal.user.email speaker.save() for speaker_proposal in SpeakerProposal.objects.all(): if not speaker_proposal.email: speaker_proposal.email = speaker_proposal.user.email speaker_proposal.save() class Migration(migrations.Migration): dependencies = [("program", "0067_auto_20180818_1634")] operations = [migrations.RunPython(add_email)]