Extend taggable-mixin to support different Tag models.
Usage is pretty simple. Tag model is default in Taggable constructor but you
can call it with different model like GHOPTaskType that inherits from Tag model.
Both Taggable and Tag models have been updated and they don't use hardcoded Tag
model anymore and instead use cls of class methods or self.__class__. In case
of Taggable it's self.__tag_model.
"Functions that help with dynamically creating decorators for views."
import types
try:
from functools import wraps
except ImportError:
from django.utils.functional import wraps # Python 2.3, 2.4 fallback.
def decorator_from_middleware(middleware_class):
"""
Given a middleware class (not an instance), returns a view decorator. This
lets you use middleware functionality on a per-view basis.
"""
def _decorator_from_middleware(*args, **kwargs):
# For historical reasons, these "decorators" are also called as
# dec(func, *args) instead of dec(*args)(func). We handle both forms
# for backwards compatibility.
has_func = True
try:
view_func = kwargs.pop('view_func')
except KeyError:
if len(args):
view_func, args = args[0], args[1:]
else:
has_func = False
if not (has_func and isinstance(view_func, types.FunctionType)):
# We are being called as a decorator.
if has_func:
args = (view_func,) + args
middleware = middleware_class(*args, **kwargs)
def decorator_func(fn):
return _decorator_from_middleware(fn, *args, **kwargs)
return decorator_func
middleware = middleware_class(*args, **kwargs)
def _wrapped_view(request, *args, **kwargs):
if hasattr(middleware, 'process_request'):
result = middleware.process_request(request)
if result is not None:
return result
if hasattr(middleware, 'process_view'):
result = middleware.process_view(request, view_func, args, kwargs)
if result is not None:
return result
try:
response = view_func(request, *args, **kwargs)
except Exception, e:
if hasattr(middleware, 'process_exception'):
result = middleware.process_exception(request, e)
if result is not None:
return result
raise
if hasattr(middleware, 'process_response'):
result = middleware.process_response(request, response)
if result is not None:
return result
return response
return wraps(view_func)(_wrapped_view)
return _decorator_from_middleware