View 类 原来代码
class View (object ):
"""
Intentionally simple parent class for all views. Only implements
dispatch-by-method and simple sanity checking.
"""
http_method_names = ['get', 'post', 'put', 'patch', 'delete', 'head', 'options', 'trace']
def __init__(self, **kwargs ):
"""
Constructor. Called in the URLconf; can contain helpful extra
keyword arguments, and other things.
"""
# Go through keyword arguments, and either save their values to our
# instance, or raise an error.
for key, value in six.iteritems (kwargs ):
setattr (self, key, value )
@
classonlymethod def as_view (cls, **initkwargs ):
"""
Main entry point for a request-response process.
"""
# sanitize keyword arguments
for key in initkwargs:
if key in cls.http_method_names:
raise TypeError ("You tried to pass in the %s method name as a "
"keyword argument to %s (). Don't do that."
% (key, cls.__name__))
if not hasattr (cls, key ):
raise TypeError ("%s () received an invalid keyword %r. as_view "
"only accepts arguments that are already "
"attributes of the class." % (cls.__name__, key ))
def view (request, *args, **kwargs ):
self = cls (**initkwargs )
if hasattr (self, 'get') and not hasattr (self, 'head'):
self.head = self.get
self.request = request #就在这里
self.args = args
self.kwargs = kwargs
return self.dispatch (request, *args, **kwargs )
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