Refactor of gist:2219751 to make it reusable

app.py

"""
This use mini_django.py, sort of micro framework based on django.
"""

import mini_django
mini_django.configure()

from django.db import models
from django.contrib import admin
from django.http import HttpResponse
 
class SomeModel(models.Model):
    field_name = models.CharField(max_length=10)

    class Meta:
        app_label = mini_django.this_module(__file__)
    __module__ = mini_django.this_module(__file__)

try:
    admin.site.register(SomeModel)
except admin.sites.AlreadyRegistered:
    pass

admin.autodiscover()

def index(request):
    out = []
    for obj in SomeModel.objects.all():
        out.append(obj.field_name)

    return HttpResponse(','.join(out))


urls = (
    (r'^$', index),
    (r'^admin/', mini_django.include(admin.site.urls)),
)

if __name__ == '__main__':
    mini_django.run(urls, __file__, __name__)

mini_django.py

"""
Django in single file with model and admin. Based on:-

http://fahhem.com/blog/2011/10/django-models-without-apps-or-everything-django-truly-in-a-single-file/
"""
import sys
from os import path as osp

def rel_path(*p): return osp.normpath(osp.join(rel_path.path, *p))
rel_path.path = osp.abspath(osp.dirname(__file__))
this = osp.splitext(osp.basename(__file__))[0]
this_module = lambda thisfile: osp.splitext(osp.basename(thisfile))[0]
 
def configure(**new_settings):
    from django.conf import settings
    SETTINGS = dict(
        SITE_ID=1,
        DATABASES = {},
        DEBUG=True,
        TEMPLATE_DEBUG=True,
        ROOT_URLCONF = this
    )
    SETTINGS['TEMPLATE_DIRS'] = (rel_path(),),
    SETTINGS['DATABASES']={
        'default':{
            'ENGINE':'django.db.backends.sqlite3',
            'NAME':rel_path('db')
        }
    }

    SETTINGS['INSTALLED_APPS'] = (
        'django.contrib.auth',
        'django.contrib.contenttypes',
        'django.contrib.sessions',
        'django.contrib.sites',
        'django.contrib.messages',
        #'django.contrib.staticfiles',
        'django.contrib.admin', 
    )

    SETTINGS.update(**new_settings)

    if not settings.configured:
        settings.configure(**SETTINGS)


from django.conf.urls.defaults import patterns, url, include
 
urlpatterns = None
def run(urls, this_file, module_name, settings=None): 
    from django.db import models
    global urlpatterns
    urlpatterns = patterns('', *urls)
    this = this_module(this_file)

    # override get_app to work with us
    get_app_orig = models.get_app
    def get_app(app_label,*a, **kw):
        if app_label == this_module(this_file):
            return sys.modules[module_name]
        return get_app_orig(app_label, *a, **kw)
    models.get_app = get_app
 
    models.loading.cache.app_store[type(this+'.models',(),{'__file__': this_file})] = this

    from django.core import management
    management.execute_from_command_line()