/
compat.py
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/
compat.py
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# coding=utf-8
from __future__ import unicode_literals
import sys
from optparse import make_option
import django
from django.conf import settings
from django.core.management.base import (BaseCommand, AppCommand, LabelCommand,
CommandError)
# flake8: noqa
#
# Python compatibility
#
PY3 = sys.version_info[0] == 3
OLD_PY2 = sys.version_info[:2] < (2, 7)
if PY3: # pragma: no cover
from io import StringIO
import importlib
elif OLD_PY2: # pragma: no cover
from cStringIO import StringIO
from django.utils import importlib
else: # pragma: no cover
from cStringIO import StringIO
import importlib
#
# Django compatibility
#
try: # Django 1.5
from django.contrib.auth import get_user_model
except ImportError: # pragma: no cover
assert django.VERSION < (1, 5)
from django.contrib.auth.models import User
User.USERNAME_FIELD = "username"
User.get_username = lambda self: self.username
def get_user_model():
return User
def list_apps():
try:
# django >= 1.7, to support AppConfig
from django.apps import apps
return [app.name for app in apps.get_app_configs()]
except ImportError:
# old way
return list(settings.INSTALLED_APPS)
def list_app_labels():
try:
# django >= 1.7, to support AppConfig
from django.apps import apps
return [app.label for app in apps.get_app_configs()]
except ImportError:
# old way
return [app.rsplit(".")[-1] for app in settings.INSTALLED_APPS]
def get_app(app_label):
try:
# django >= 1.7
from django.apps import apps
return apps.get_app_config(app_label).models_module
except ImportError:
from django.db import models
return models.get_app(app_label)
def get_apps():
try:
# django >= 1.7, to support AppConfig
from django.apps import apps
return [app.models_module for app in apps.get_app_configs() if app.models_module]
except ImportError:
from django.db import models
return models.get_apps()
def get_apps_from_cache():
try:
from django.apps import apps
return [app.models_module for app in apps.get_app_configs() if app.models_module]
except ImportError:
from django.db.models.loading import cache
return cache.get_apps()
def get_models_from_cache(app):
try:
from django.apps import apps
return apps.get_models(app)
except ImportError:
from django.db.models.loading import cache
return cache.get_models(app)
def get_app_models(app_labels=None):
if app_labels is None:
try:
# django >= 1.7, to support AppConfig
from django.apps import apps
return apps.get_models(include_auto_created=True)
except ImportError:
from django.db import models
return models.get_models(include_auto_created=True)
if not isinstance(app_labels, (list, tuple, set)):
app_labels = [app_labels]
app_models = []
try:
# django >= 1.7, to support AppConfig
from django.apps import apps
for app_label in app_labels:
app_config = apps.get_app_config(app_label)
app_models.extend(app_config.get_models(include_auto_created=True))
except ImportError:
from django.db import models
try:
app_list = [models.get_app(app_label) for app_label in app_labels]
except (models.ImproperlyConfigured, ImportError) as e:
raise CommandError("%s. Are you sure your INSTALLED_APPS setting is correct?" % e)
for app in app_list:
app_models.extend(models.get_models(app, include_auto_created=True))
return app_models
def get_model_compat(app_label, model_name):
"""Get a model on multiple Django versions."""
try:
# django >= 1.7
from django.apps import apps
return apps.get_model(app_label, model_name)
except ImportError:
from django.db.models import get_model
return get_model(app_label, model_name)
def get_models_compat(app_label):
"""Get models on multiple Django versions."""
try:
# django >= 1.7
from django.apps import apps
return apps.get_app_config(app_label).get_models()
except ImportError:
from django.db.models import get_models
return get_models(app_label)
def get_models_for_app(app_label):
"""Returns the models in the given app."""
try:
# django >= 1.7
from django.apps import apps
return apps.get_app_config(app_label).get_models()
except ImportError:
from django.db.models import get_app, get_models
return get_models(get_app(app_label))
def load_tag_library(libname):
"""Load a templatetag library on multiple Django versions.
Returns None if the library isn't loaded.
"""
if django.VERSION < (1, 9):
from django.template.base import get_library, InvalidTemplateLibrary
try:
lib = get_library(libname)
return lib
except InvalidTemplateLibrary:
return None
else:
from django.template.backends.django import get_installed_libraries
from django.template.library import InvalidTemplateLibrary
try:
lib = get_installed_libraries()[libname]
lib = importlib.import_module(lib).register
return lib
except (InvalidTemplateLibrary, KeyError):
return None
def add_to_builtins_compat(name):
if django.VERSION < (1, 9):
from django.template.base import add_to_builtins
add_to_builtins(name)
else:
from django.template import engines
engines['django'].engine.builtins.append(name)
class ProxyParser(object):
"""Faux parser object that will ferry our arguments into options."""
def __init__(self, command):
self.command = command
def add_argument(self, *args, **kwargs):
self.command.option_list += (make_option(*args, **kwargs), )
class CompatibilityBaseCommand(BaseCommand):
"""Provides a compatibility between optparse and argparse transition.
Starting in Django 1.8, argparse is used. In Django 1.9, optparse support
will be removed.
For optparse, you append to the option_list class attribute.
For argparse, you must define add_arguments(self, parser).
BaseCommand uses the presence of option_list to decide what course to take.
"""
def __init__(self, *args, **kwargs):
if django.VERSION < (1, 8) and hasattr(self, 'add_arguments'):
self.option_list = BaseCommand.option_list
parser = ProxyParser(self)
self.add_arguments(parser)
super(CompatibilityBaseCommand, self).__init__(*args, **kwargs)
class CompatibilityAppCommand(AppCommand, CompatibilityBaseCommand):
"""AppCommand is a BaseCommand sub-class without its own __init__."""
class CompatibilityLabelCommand(LabelCommand, CompatibilityBaseCommand):
"""LabelCommand is a BaseCommand sub-class without its own __init__."""