author | Lennard de Rijk <ljvderijk@gmail.com> |
Sat, 31 Jan 2009 13:48:48 +0000 | |
changeset 1107 | a878188e225c |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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import copy |
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from django.db.models.query import QuerySet, EmptyQuerySet, insert_query |
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from django.db.models import signals |
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from django.db.models.fields import FieldDoesNotExist |
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def ensure_default_manager(sender, **kwargs): |
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cls = sender |
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if not getattr(cls, '_default_manager', None) and not cls._meta.abstract: |
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# Create the default manager, if needed. |
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try: |
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cls._meta.get_field('objects') |
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raise ValueError, "Model %s must specify a custom Manager, because it has a field named 'objects'" % cls.__name__ |
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except FieldDoesNotExist: |
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pass |
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cls.add_to_class('objects', Manager()) |
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signals.class_prepared.connect(ensure_default_manager) |
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class Manager(object): |
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# Tracks each time a Manager instance is created. Used to retain order. |
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creation_counter = 0 |
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def __init__(self): |
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super(Manager, self).__init__() |
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self._set_creation_counter() |
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self.model = None |
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self._inherited = False |
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def contribute_to_class(self, model, name): |
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# TODO: Use weakref because of possible memory leak / circular reference. |
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self.model = model |
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setattr(model, name, ManagerDescriptor(self)) |
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if not getattr(model, '_default_manager', None) or self.creation_counter < model._default_manager.creation_counter: |
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model._default_manager = self |
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if model._meta.abstract or self._inherited: |
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model._meta.abstract_managers.append((self.creation_counter, name, |
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self)) |
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def _set_creation_counter(self): |
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""" |
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Sets the creation counter value for this instance and increments the |
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class-level copy. |
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""" |
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self.creation_counter = Manager.creation_counter |
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Manager.creation_counter += 1 |
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def _copy_to_model(self, model): |
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""" |
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Makes a copy of the manager and assigns it to 'model', which should be |
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a child of the existing model (used when inheriting a manager from an |
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abstract base class). |
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""" |
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assert issubclass(model, self.model) |
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mgr = copy.copy(self) |
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mgr._set_creation_counter() |
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mgr.model = model |
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mgr._inherited = True |
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return mgr |
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####################### |
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# PROXIES TO QUERYSET # |
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####################### |
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def get_empty_query_set(self): |
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return EmptyQuerySet(self.model) |
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def get_query_set(self): |
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"""Returns a new QuerySet object. Subclasses can override this method |
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to easily customize the behavior of the Manager. |
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""" |
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return QuerySet(self.model) |
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def none(self): |
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return self.get_empty_query_set() |
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def all(self): |
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return self.get_query_set() |
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def count(self): |
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return self.get_query_set().count() |
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def dates(self, *args, **kwargs): |
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return self.get_query_set().dates(*args, **kwargs) |
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def distinct(self, *args, **kwargs): |
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return self.get_query_set().distinct(*args, **kwargs) |
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def extra(self, *args, **kwargs): |
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return self.get_query_set().extra(*args, **kwargs) |
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def get(self, *args, **kwargs): |
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return self.get_query_set().get(*args, **kwargs) |
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def get_or_create(self, **kwargs): |
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return self.get_query_set().get_or_create(**kwargs) |
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def create(self, **kwargs): |
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return self.get_query_set().create(**kwargs) |
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def filter(self, *args, **kwargs): |
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return self.get_query_set().filter(*args, **kwargs) |
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def complex_filter(self, *args, **kwargs): |
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return self.get_query_set().complex_filter(*args, **kwargs) |
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def exclude(self, *args, **kwargs): |
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return self.get_query_set().exclude(*args, **kwargs) |
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def in_bulk(self, *args, **kwargs): |
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return self.get_query_set().in_bulk(*args, **kwargs) |
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def iterator(self, *args, **kwargs): |
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return self.get_query_set().iterator(*args, **kwargs) |
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def latest(self, *args, **kwargs): |
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return self.get_query_set().latest(*args, **kwargs) |
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118 |
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def order_by(self, *args, **kwargs): |
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return self.get_query_set().order_by(*args, **kwargs) |
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121 |
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def select_related(self, *args, **kwargs): |
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return self.get_query_set().select_related(*args, **kwargs) |
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def values(self, *args, **kwargs): |
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return self.get_query_set().values(*args, **kwargs) |
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127 |
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def values_list(self, *args, **kwargs): |
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return self.get_query_set().values_list(*args, **kwargs) |
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130 |
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def update(self, *args, **kwargs): |
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return self.get_query_set().update(*args, **kwargs) |
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133 |
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def reverse(self, *args, **kwargs): |
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return self.get_query_set().reverse(*args, **kwargs) |
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136 |
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def _insert(self, values, **kwargs): |
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return insert_query(self.model, values, **kwargs) |
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def _update(self, values, **kwargs): |
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return self.get_query_set()._update(values, **kwargs) |
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142 |
|
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class ManagerDescriptor(object): |
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# This class ensures managers aren't accessible via model instances. |
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# For example, Poll.objects works, but poll_obj.objects raises AttributeError. |
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def __init__(self, manager): |
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self.manager = manager |
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|
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def __get__(self, instance, type=None): |
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if instance != None: |
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raise AttributeError, "Manager isn't accessible via %s instances" % type.__name__ |
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return self.manager |
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class EmptyManager(Manager): |
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def get_query_set(self): |
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return self.get_empty_query_set() |