new_contents: # -*- coding: utf-8 -*-
  # Generated by Django 1.11.27 on 2020-01-14 17:40
  
  from django.db import migrations
  from django.db.models import OuterRef, Subquery
  
  
  def forwards_func(apps, schema_editor):
      """Migrate ``Project.documentation_type`` to ``Version.documentation_type``."""
      Version = apps.get_model('builds', 'Version')
      Project = apps.get_model('projects', 'Project')
  
      Version.objects.all().update(
          documentation_type=Subquery(
              Project.objects
              .filter(pk=OuterRef('project'))
              .values('documentation_type')[:1]
          ),
      )
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('builds', '0013_version_documentation_type'),
      ]
  
      operations = [
          migrations.RunPython(forwards_func),
      ]
  
subject: Migrate documentation_type from Project to Version