def encode_xdb_key(key, encoder=None):
"""
Convert the `db.Key` to it's entity and encode it.
"""
gae_objects = getGAEObjects(encoder.context.extra)
klass = db.class_for_kind(key.kind())
try:
referenced_object = gae_objects.get(klass, key)
except KeyError:
referenced_object = db.get(key)
gae_objects.set(klass, key, referenced_object)
if not referenced_object:
encoder.writeElement(None)
else:
encoder.writeObject(referenced_object)
python类class_for_kind()的实例源码
_google_appengine_ext_db.py 文件源码
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def GetImplementationClass(kind_or_class_key):
"""Returns the implementation class for a given kind or class key.
Args:
kind_or_class_key: A kind string or a tuple of kind strings.
Return:
A db.Model subclass for the given kind or class key.
"""
if isinstance(kind_or_class_key, tuple):
try:
implementation_class = polymodel._class_map[kind_or_class_key]
except KeyError:
raise db.KindError('No implementation for class \'%s\'' %
kind_or_class_key)
else:
implementation_class = db.class_for_kind(kind_or_class_key)
return implementation_class
def GetImplementationClass(kind_or_class_key):
"""Returns the implementation class for a given kind or class key.
Args:
kind_or_class_key: A kind string or a tuple of kind strings.
Return:
A db.Model subclass for the given kind or class key.
"""
if isinstance(kind_or_class_key, tuple):
try:
implementation_class = polymodel._class_map[kind_or_class_key]
except KeyError:
raise db.KindError('No implementation for class \'%s\'' %
kind_or_class_key)
else:
implementation_class = db.class_for_kind(kind_or_class_key)
return implementation_class
def GetImplementationClass(kind_or_class_key):
"""Returns the implementation class for a given kind or class key.
Args:
kind_or_class_key: A kind string or a tuple of kind strings.
Return:
A db.Model subclass for the given kind or class key.
"""
if isinstance(kind_or_class_key, tuple):
try:
implementation_class = polymodel._class_map[kind_or_class_key]
except KeyError:
raise db.KindError('No implementation for class \'%s\'' %
kind_or_class_key)
else:
implementation_class = db.class_for_kind(kind_or_class_key)
return implementation_class
def GetImplementationClass(kind_or_class_key):
"""Returns the implementation class for a given kind or class key.
Args:
kind_or_class_key: A kind string or a tuple of kind strings.
Return:
A db.Model subclass for the given kind or class key.
"""
if isinstance(kind_or_class_key, tuple):
try:
implementation_class = polymodel._class_map[kind_or_class_key]
except KeyError:
raise db.KindError('No implementation for class \'%s\'' %
kind_or_class_key)
else:
implementation_class = db.class_for_kind(kind_or_class_key)
return implementation_class
def GetImplementationClass(kind_or_class_key):
"""Returns the implementation class for a given kind or class key.
Args:
kind_or_class_key: A kind string or a tuple of kind strings.
Return:
A db.Model subclass for the given kind or class key.
"""
if isinstance(kind_or_class_key, tuple):
try:
implementation_class = polymodel._class_map[kind_or_class_key]
except KeyError:
raise db.KindError('No implementation for class \'%s\'' %
kind_or_class_key)
else:
implementation_class = db.class_for_kind(kind_or_class_key)
return implementation_class
