def getter(func):
if not func.__name__.startswith("get_"):
raise invalidmethodname("method name must start with 'get_'")
func.getter = true
return func
class resource(userdict.dictmixin):
def exposed_attrs(self):
"""attribute names to be exposed as keys"""
return
def hidden_keys(self):
"""keys to hide from iteration. a key will still be accessible if it is
a getter or if it is listed in exposed_attrs()"""
return
def child_object(self, name):
"""called to get a child object if it isn't found as a getter or an attribute"""
raise attributeerror
# dictionary methods
def __getitem__(self, key):
"""called to implement evaluation of self[key]"""
getter = getattr(self, 'get_'+key, none)
if hasattr(getter, 'getter'):
return getter()
if key in self.exposed_attrs():
return getattr(self, key)
return self.child_object(key)
def __setitem__(self, key, value):
"""called to implement assignment to self[key]"""
setter = getattr(self, 'set_'+key, none)
if hasattr(setter, 'setter'):
return setter(value)
def __delitem__(self, key):
"""called to implement deletion of self[key]"""
deleter = getattr(self, 'del_'+key, none)
if hasattr(deleter, 'deleter'):
return deleter(value)
def keys(self):
"""list of keys for iteration"""
getter_keys = [name.replace('get_', '', 1) for name in dir(self)
if hasattr(getattr(self, name, none), 'getter')]
exposed_keys = getter_keys + self.exposed_attrs()
return [key for key in exposed_keys if key not in self.hidden_keys()]
當繼承db.model時，同時繼承resource：
class personmodel(resource, db.model):
user_id = db.stringproperty()
user_content = db.textproperty()
@getter
def get_uid(self):
return self.user_id
@getter
def get_content(self):
return self.user_content
在處理請求的時候，再做如下處理：
def post(self):
self.dispatch_request()
def dispatch_request(self):
self.response.headers["content-type"] = "text/plain"
params = {}
for key in self.request.params:
params[str(key)] = self.request.get(key)
obj = //fetch data from personmodel.
obj = self.preserialize(obj)
out = ******json.dumps(obj)
self.response.out.write(out)
def translate(self, obj, depth):
return obj
def preserialize(self, obj, depth=0):
obj = self.translate(obj, depth)
if isinstance(obj, datetime.datetime):
return obj.isoformat()
elif isinstance(obj, db.users.user):
return obj.nickname()
elif isinstance(obj, (db.geopt, db.im, db.key)):
return str(obj)
elif isinstance(obj, types.listtype):
return [self.preserialize(item, depth+1) for item in obj]
elif isinstance(obj, (types.dicttype, resource)):
copy = {}
for key in obj:
copy[key] = self.preserialize(obj[key], depth+1)
return copy
return obj
這個方法不是太好，還有很大的優化空間...
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