Python django.shortcuts 模块，_get_queryset() 实例源码
我们从Python开源项目中，提取了以下5个代码示例，用于说明如何使用django.shortcuts._get_queryset()。
def get_object_or_403(klass, *args, **kwargs):
"""
Uses get() to return an object,or raises a PermissionDenied exception if the object
does not exist.
klass may be a Model,Manager,or QuerySet object. All other passed
arguments and keyword arguments are used in the get() query.
Note: Like with get(),an MultipleObjectsReturned will be raised if more than one
object is found.
"""
queryset = _get_queryset(klass)
try:
return queryset.get(*args, **kwargs)
except queryset.model.DoesNotExist:
raise PermissionDenied
def get_object_or_none(klass, **kwargs):
queryset = _get_queryset(klass)
try:
return queryset.get(*args, **kwargs)
except AttributeError:
klass__name = klass.__name__ if isinstance(klass, type) else klass.__class__.__name__
raise ValueError(
"First argument to get_object_or_none() must be a Model,"
"or QuerySet,not '%s'." % klass__name
)
except queryset.model.DoesNotExist:
return None
def get_queryset_size(klass, *args, **kwargs):
queryset = _get_queryset(klass)
try:
obj_list = list(queryset.filter(*args, **kwargs))
except AttributeError:
klass__name = klass.__name__ if isinstance(klass, type) else klass.__class__.__name__
raise ValueError(
"First argument get_queryset_size() must be a Model,or "
"QuerySet,not '%s'." % klass__name
)
if not obj_list:
return 0
return len(obj_list)
def get_object_or_none(klass,not '%s'." % klass__name
)
except queryset.model.DoesNotExist:
return None
def __init__(self, model_or_qs):
self.queryset = _get_queryset(model_or_qs)
self.model = self.queryset.model
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