gistfile1.txt

'''
Mezzanine lets you inject fields on its own stock models using the EXTRA_MODEL_FIELDS setting.

However, as the Mezzanine docs point out (http://mezzanine.jupo.org/docs/model-customization.html#field-injection-caveats), there are some "caveats" regarding migrations.

Specifically, the migrations need to be placed in a local app even though they're applied to the Mezzanine models.

What's the proper way to do this in Django 1.7?  I have a solution below that works, but it's obviously ugly.
'''


### Here's the output of makemigrations:

Migrations for 'pages':
  0002_auto_20141031_1932.py:
    - Add field theme to page
    - Alter field in_menus on page
Full migrations file '0002_auto_20141031_1932.py':
# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import models, migrations
import mezzanine.pages.fields


class Migration(migrations.Migration):

    dependencies = [
        ('blogging', '0002_theme'),
        ('pages', '0001_initial'),
    ]

    operations = [
        migrations.AddField(
            model_name='page',
            name='theme',
            field=models.ForeignKey(blank=True, to='blogging.Theme', null=True),
            preserve_default=True,
        ),
    ]

### And here's my monkeypatch to make it work properly:

class AddFieldToOtherApp(migrations.AddField):

     def __init__(self, app_name, *args, **kwargs):
        self.app_name = app_name
        return super(AddFieldToOtherApp, self).__init__(*args, **kwargs)

     def state_forwards(self, app_label, state):
        return super(AddFieldToOtherApp, self).state_forwards(self.app_name, state)

class Migration(migrations.Migration):

    dependencies = [
        ('blogging', '0002_theme'),
        ('pages', '0001_initial'),
    ]

    operations = [
        AddFieldToOtherApp(
            app_name='pages',
            model_name='page',
            name='theme',
            field=models.ForeignKey(blank=True, to='blogging.Theme', null=True),
            preserve_default=True,
        ),
    ]