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"""Mixin classes that provide a determine_method(request) function to determine the HTTP
method that a given request should be treated as. We use this more generic behaviour to
allow for overloaded methods in POST forms.
See Richardson & Ruby's RESTful Web Services for justification.
"""
class MethodMixin(object):
"""Base class for all MethodMixin classes, which simply defines the interface they provide."""
def determine_method(self, request):
"""Simply return GET, POST etc... as appropriate."""
raise NotImplementedError()
class StandardMethodMixin(MethodMixin):
"""Provide for standard HTTP behaviour, with no overloaded POST."""
def determine_method(self, request):
"""Simply return GET, POST etc... as appropriate."""
return request.method.upper()
class OverloadedPOSTMethodMixin(MethodMixin):
"""Provide for overloaded POST behaviour."""
"""The name to use for the method override field in the POST form."""
FORM_PARAM_METHOD = '_method'
def determine_method(self, request):
"""Simply return GET, POST etc... as appropriate, allowing for POST overloading
by setting a form field with the requested method name."""
method = request.method.upper()
if method == 'POST' and self.FORM_PARAM_METHOD and request.POST.has_key(self.FORM_PARAM_METHOD):
method = request.POST[self.FORM_PARAM_METHOD].upper()
return method
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