Fixed a couple typos as well as several minor style issues.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@7871 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Gary Wilson Jr
parent
409ed9468f
commit
96a47da015
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@ -3,6 +3,10 @@ import types
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import sys
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import os
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from itertools import izip
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try:
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set
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except NameError:
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from sets import Set as set # Python 2.3 fallback.
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import django.db.models.manipulators # Imported to register signal handler.
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import django.db.models.manager # Ditto.
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@ -23,13 +27,11 @@ from django.core.files.move import file_move_safe
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from django.core.files import locks
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from django.conf import settings
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try:
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set
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except NameError:
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from sets import Set as set # Python 2.3 fallback
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class ModelBase(type):
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"Metaclass for all models"
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"""
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Metaclass for all models.
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"""
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def __new__(cls, name, bases, attrs):
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super_new = super(ModelBase, cls).__new__
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parents = [b for b in bases if isinstance(b, ModelBase)]
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@ -144,7 +146,9 @@ class ModelBase(type):
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setattr(cls, name, value)
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def _prepare(cls):
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# Creates some methods once self._meta has been populated.
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"""
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Creates some methods once self._meta has been populated.
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"""
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opts = cls._meta
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opts._prepare(cls)
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@ -163,6 +167,7 @@ class ModelBase(type):
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dispatcher.send(signal=signals.class_prepared, sender=cls)
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class Model(object):
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__metaclass__ = ModelBase
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@ -267,7 +272,7 @@ class Model(object):
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def save(self):
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"""
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Save the current instance. Override this in a subclass if you want to
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Saves the current instance. Override this in a subclass if you want to
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control the saving process.
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"""
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self.save_base()
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@ -371,10 +376,12 @@ class Model(object):
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def _collect_sub_objects(self, seen_objs, parent=None, nullable=False):
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"""
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Recursively populates seen_objs with all objects related to this object.
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Recursively populates seen_objs with all objects related to this
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object.
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When done, seen_objs.items() will be in the format:
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[(model_class, {pk_val: obj, pk_val: obj, ...}),
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(model_class, {pk_val: obj, pk_val: obj, ...}),...]
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(model_class, {pk_val: obj, pk_val: obj, ...}), ...]
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"""
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pk_val = self._get_pk_val()
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if seen_objs.add(self.__class__, pk_val, self, parent, nullable):
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@ -411,11 +418,11 @@ class Model(object):
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def delete(self):
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assert self._get_pk_val() is not None, "%s object can't be deleted because its %s attribute is set to None." % (self._meta.object_name, self._meta.pk.attname)
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# Find all the objects than need to be deleted
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# Find all the objects than need to be deleted.
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seen_objs = CollectedObjects()
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self._collect_sub_objects(seen_objs)
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# Actually delete the objects
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# Actually delete the objects.
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delete_objects(seen_objs)
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delete.alters_data = True
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@ -454,12 +461,12 @@ class Model(object):
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return getattr(self, cachename)
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def _get_FIELD_filename(self, field):
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if getattr(self, field.attname): # value is not blank
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if getattr(self, field.attname): # Value is not blank.
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return os.path.normpath(os.path.join(settings.MEDIA_ROOT, getattr(self, field.attname)))
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return ''
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def _get_FIELD_url(self, field):
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if getattr(self, field.attname): # value is not blank
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if getattr(self, field.attname): # Value is not blank.
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import urlparse
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return urlparse.urljoin(settings.MEDIA_URL, getattr(self, field.attname)).replace('\\', '/')
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return ''
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@ -474,16 +481,14 @@ class Model(object):
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except OSError: # Directory probably already exists.
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pass
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#
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# Check for old-style usage (files-as-dictionaries). Warn here first
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# since there are multiple locations where we need to support both new
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# and old usage.
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#
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if isinstance(raw_field, dict):
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import warnings
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warnings.warn(
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message = "Representing uploaded files as dictionaries is"\
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" deprected. Use django.core.files.SimpleUploadedFile"\
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" deprecated. Use django.core.files.SimpleUploadedFile"\
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" instead.",
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category = DeprecationWarning,
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stacklevel = 2
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@ -508,30 +513,23 @@ class Model(object):
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filename = field.get_filename(filename)
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#
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# If the filename already exists, keep adding an underscore to the name of
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# the file until the filename doesn't exist.
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#
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# If the filename already exists, keep adding an underscore to the name
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# of the file until the filename doesn't exist.
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while os.path.exists(os.path.join(settings.MEDIA_ROOT, filename)):
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try:
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dot_index = filename.rindex('.')
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except ValueError: # filename has no dot
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except ValueError: # filename has no dot.
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filename += '_'
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else:
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filename = filename[:dot_index] + '_' + filename[dot_index:]
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#
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# Save the file name on the object and write the file to disk
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#
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# Save the file name on the object and write the file to disk.
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setattr(self, field.attname, filename)
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full_filename = self._get_FIELD_filename(field)
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if hasattr(raw_field, 'temporary_file_path'):
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# This file has a file path that we can move.
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raw_field.close()
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file_move_safe(raw_field.temporary_file_path(), full_filename)
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else:
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# This is a normal uploadedfile that we can stream.
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fp = open(full_filename, 'wb')
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@ -542,7 +540,8 @@ class Model(object):
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fp.close()
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# Save the width and/or height, if applicable.
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if isinstance(field, ImageField) and (field.width_field or field.height_field):
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if isinstance(field, ImageField) and \
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(field.width_field or field.height_field):
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from django.utils.images import get_image_dimensions
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width, height = get_image_dimensions(full_filename)
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if field.width_field:
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@ -550,7 +549,7 @@ class Model(object):
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if field.height_field:
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setattr(self, field.height_field, height)
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# Save the object because it has changed unless save is False
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# Save the object because it has changed, unless save is False.
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if save:
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self.save()
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@ -570,6 +569,7 @@ class Model(object):
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setattr(self, cachename, get_image_dimensions(filename))
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return getattr(self, cachename)
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############################################
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# HELPER FUNCTIONS (CURRIED MODEL METHODS) #
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############################################
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@ -585,6 +585,7 @@ def method_set_order(ordered_obj, self, id_list):
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ordered_obj.objects.filter(**{'pk': j, order_name: rel_val}).update(_order=i)
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transaction.commit_unless_managed()
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def method_get_order(ordered_obj, self):
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rel_val = getattr(self, ordered_obj._meta.order_with_respect_to.rel.field_name)
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order_name = ordered_obj._meta.order_with_respect_to.name
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@ -592,6 +593,7 @@ def method_get_order(ordered_obj, self):
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return [r[pk_name] for r in
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ordered_obj.objects.filter(**{order_name: rel_val}).values(pk_name)]
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##############################################
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# HELPER FUNCTIONS (CURRIED MODEL FUNCTIONS) #
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##############################################
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@ -599,6 +601,7 @@ def method_get_order(ordered_obj, self):
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def get_absolute_url(opts, func, self, *args, **kwargs):
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return settings.ABSOLUTE_URL_OVERRIDES.get('%s.%s' % (opts.app_label, opts.module_name), func)(self, *args, **kwargs)
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########
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# MISC #
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########
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@ -610,8 +613,6 @@ if sys.version_info < (2, 5):
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# Prior to Python 2.5, Exception was an old-style class
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def subclass_exception(name, parent, unused):
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return types.ClassType(name, (parent,), {})
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else:
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def subclass_exception(name, parent, module):
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return type(name, (parent,), {'__module__': module})
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@ -13,19 +13,20 @@ from django.utils.datastructures import SortedDict
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CHUNK_SIZE = 100
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ITER_CHUNK_SIZE = CHUNK_SIZE
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# Pull into this namespace for backwards compatibility
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# Pull into this namespace for backwards compatibility.
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EmptyResultSet = sql.EmptyResultSet
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class CyclicDependency(Exception):
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pass
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class CollectedObjects(object):
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"""
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A container that stores keys and lists of values along with
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remembering the parent objects for all the keys.
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A container that stores keys and lists of values along with remembering the
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parent objects for all the keys.
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This is used for the database object deletion routines so that we
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can calculate the 'leaf' objects which should be deleted first.
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This is used for the database object deletion routines so that we can
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calculate the 'leaf' objects which should be deleted first.
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"""
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def __init__(self):
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@ -34,26 +35,27 @@ class CollectedObjects(object):
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def add(self, model, pk, obj, parent_model, nullable=False):
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"""
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Adds an item.
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model is the class of the object being added,
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pk is the primary key, obj is the object itself,
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parent_model is the model of the parent object
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that this object was reached through, nullable should
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be True if this relation is nullable.
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Adds an item to the container.
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If the item already existed in the structure,
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returns true, otherwise false.
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Arguments:
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* model - the class of the object being added.
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* pk - the primary key.
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* obj - the object itself.
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* parent_model - the model of the parent object that this object was
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reached through.
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* nullable - should be True if this relation is nullable.
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Returns True if the item already existed in the structure and
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False otherwise.
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"""
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d = self.data.setdefault(model, SortedDict())
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retval = pk in d
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d[pk] = obj
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# Nullable relationships can be ignored -- they
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# are nulled out before deleting, and therefore
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# do not affect the order in which objects have
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# to be deleted.
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# Nullable relationships can be ignored -- they are nulled out before
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# deleting, and therefore do not affect the order in which objects
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# have to be deleted.
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if parent_model is not None and not nullable:
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self.children.setdefault(parent_model, []).append(model)
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return retval
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def __contains__(self, key):
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@ -77,8 +79,8 @@ class CollectedObjects(object):
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def ordered_keys(self):
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"""
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Returns the models in the order that they should be
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dealth with i.e. models with no dependencies first.
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Returns the models in the order that they should be dealt with (i.e.
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models with no dependencies first).
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"""
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dealt_with = SortedDict()
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# Start with items that have no children
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@ -91,19 +93,22 @@ class CollectedObjects(object):
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dealt_with[model] = None
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found = True
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if not found:
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raise CyclicDependency("There is a cyclic dependency of items to be processed.")
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raise CyclicDependency(
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"There is a cyclic dependency of items to be processed.")
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return dealt_with.keys()
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def unordered_keys(self):
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"""
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Fallback for the case where is a cyclic dependency but we
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don't care.
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Fallback for the case where is a cyclic dependency but we don't care.
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"""
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return self.data.keys()
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class QuerySet(object):
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"Represents a lazy database lookup for a set of objects"
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"""
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Represents a lazy database lookup for a set of objects.
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"""
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def __init__(self, model=None, query=None):
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self.model = model
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self.query = query or sql.Query(self.model, connection)
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@ -116,7 +121,7 @@ class QuerySet(object):
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def __getstate__(self):
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"""
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Allows the Queryset to be pickled.
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Allows the QuerySet to be pickled.
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"""
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# Force the cache to be fully populated.
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len(self)
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@ -131,7 +136,7 @@ class QuerySet(object):
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def __len__(self):
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# Since __len__ is called quite frequently (for example, as part of
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# list(qs), we make some effort here to be as efficient as possible
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# whilst not messing up any existing iterators against the queryset.
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# whilst not messing up any existing iterators against the QuerySet.
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if self._result_cache is None:
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if self._iter:
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self._result_cache = list(self._iter)
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@ -173,7 +178,9 @@ class QuerySet(object):
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return True
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def __getitem__(self, k):
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"Retrieve an item or slice from the set of results."
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"""
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Retrieves an item or slice from the set of results.
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"""
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if not isinstance(k, (slice, int, long)):
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raise TypeError
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assert ((not isinstance(k, slice) and (k >= 0))
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@ -264,7 +271,7 @@ class QuerySet(object):
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Performs a SELECT COUNT() and returns the number of records as an
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integer.
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If the queryset is already cached (i.e. self._result_cache is set) this
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If the QuerySet is already cached (i.e. self._result_cache is set) this
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simply returns the length of the cached results set to avoid multiple
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SELECT COUNT(*) calls.
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"""
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@ -290,7 +297,7 @@ class QuerySet(object):
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def create(self, **kwargs):
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"""
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Create a new object with the given kwargs, saving it to the database
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Creates a new object with the given kwargs, saving it to the database
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and returning the created object.
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"""
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obj = self.model(**kwargs)
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@ -425,8 +432,8 @@ class QuerySet(object):
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def dates(self, field_name, kind, order='ASC'):
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"""
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Returns a list of datetime objects representing all available dates
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for the given field_name, scoped to 'kind'.
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Returns a list of datetime objects representing all available dates for
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the given field_name, scoped to 'kind'.
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"""
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assert kind in ("month", "year", "day"), \
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"'kind' must be one of 'year', 'month' or 'day'."
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@ -441,7 +448,7 @@ class QuerySet(object):
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def none(self):
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"""
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Returns an empty queryset.
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Returns an empty QuerySet.
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"""
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return self._clone(klass=EmptyQuerySet)
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@ -485,6 +492,7 @@ class QuerySet(object):
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def complex_filter(self, filter_obj):
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"""
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Returns a new QuerySet instance with filter_obj added to the filters.
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filter_obj can be a Q object (or anything with an add_to_query()
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method) or a dictionary of keyword lookup arguments.
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@ -500,8 +508,9 @@ class QuerySet(object):
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def select_related(self, *fields, **kwargs):
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"""
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Returns a new QuerySet instance that will select related objects. If
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fields are specified, they must be ForeignKey fields and only those
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Returns a new QuerySet instance that will select related objects.
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If fields are specified, they must be ForeignKey fields and only those
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related objects are included in the selection.
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"""
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depth = kwargs.pop('depth', 0)
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|
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@ -521,13 +530,15 @@ class QuerySet(object):
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def dup_select_related(self, other):
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"""
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Copies the related selection status from the queryset 'other' to the
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current queryset.
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Copies the related selection status from the QuerySet 'other' to the
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current QuerySet.
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"""
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self.query.select_related = other.query.select_related
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def order_by(self, *field_names):
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"""Returns a new QuerySet instance with the ordering changed."""
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"""
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Returns a new QuerySet instance with the ordering changed.
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"""
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assert self.query.can_filter(), \
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"Cannot reorder a query once a slice has been taken."
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obj = self._clone()
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|
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@ -544,9 +555,9 @@ class QuerySet(object):
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return obj
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def extra(self, select=None, where=None, params=None, tables=None,
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order_by=None, select_params=None):
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order_by=None, select_params=None):
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"""
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Add extra SQL fragments to the query.
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Adds extra SQL fragments to the query.
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"""
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assert self.query.can_filter(), \
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"Cannot change a query once a slice has been taken"
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|
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@ -556,7 +567,7 @@ class QuerySet(object):
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def reverse(self):
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"""
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Reverses the ordering of the queryset.
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Reverses the ordering of the QuerySet.
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"""
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clone = self._clone()
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clone.query.standard_ordering = not clone.query.standard_ordering
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|
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@ -589,12 +600,13 @@ class QuerySet(object):
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def _merge_sanity_check(self, other):
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"""
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Checks that we are merging two comparable queryset classes. By default
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Checks that we are merging two comparable QuerySet classes. By default
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this does nothing, but see the ValuesQuerySet for an example of where
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it's useful.
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"""
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pass
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|
||||
class ValuesQuerySet(QuerySet):
|
||||
def __init__(self, *args, **kwargs):
|
||||
super(ValuesQuerySet, self).__init__(*args, **kwargs)
|
||||
|
|
@ -617,7 +629,7 @@ class ValuesQuerySet(QuerySet):
|
|||
Constructs the field_names list that the values query will be
|
||||
retrieving.
|
||||
|
||||
Called by the _clone() method after initialising the rest of the
|
||||
Called by the _clone() method after initializing the rest of the
|
||||
instance.
|
||||
"""
|
||||
self.extra_names = []
|
||||
|
|
@ -658,6 +670,7 @@ class ValuesQuerySet(QuerySet):
|
|||
raise TypeError("Merging '%s' classes must involve the same values in each case."
|
||||
% self.__class__.__name__)
|
||||
|
||||
|
||||
class ValuesListQuerySet(ValuesQuerySet):
|
||||
def iterator(self):
|
||||
self.query.trim_extra_select(self.extra_names)
|
||||
|
|
@ -681,6 +694,7 @@ class ValuesListQuerySet(ValuesQuerySet):
|
|||
clone.flat = self.flat
|
||||
return clone
|
||||
|
||||
|
||||
class DateQuerySet(QuerySet):
|
||||
def iterator(self):
|
||||
return self.query.results_iter()
|
||||
|
|
@ -689,7 +703,7 @@ class DateQuerySet(QuerySet):
|
|||
"""
|
||||
Sets up any special features of the query attribute.
|
||||
|
||||
Called by the _clone() method after initialising the rest of the
|
||||
Called by the _clone() method after initializing the rest of the
|
||||
instance.
|
||||
"""
|
||||
self.query = self.query.clone(klass=sql.DateQuery, setup=True)
|
||||
|
|
@ -706,6 +720,7 @@ class DateQuerySet(QuerySet):
|
|||
c._setup_query()
|
||||
return c
|
||||
|
||||
|
||||
class EmptyQuerySet(QuerySet):
|
||||
def __init__(self, model=None, query=None):
|
||||
super(EmptyQuerySet, self).__init__(model, query)
|
||||
|
|
@ -733,6 +748,7 @@ class EmptyQuerySet(QuerySet):
|
|||
# (it raises StopIteration immediately).
|
||||
yield iter([]).next()
|
||||
|
||||
|
||||
# QOperator, QNot, QAnd and QOr are temporarily retained for backwards
|
||||
# compatibility. All the old functionality is now part of the 'Q' class.
|
||||
class QOperator(Q):
|
||||
|
|
@ -743,12 +759,14 @@ class QOperator(Q):
|
|||
|
||||
QOr = QAnd = QOperator
|
||||
|
||||
|
||||
def QNot(q):
|
||||
warnings.warn('Use ~q instead of QNot(q)', DeprecationWarning, stacklevel=2)
|
||||
return ~q
|
||||
|
||||
|
||||
def get_cached_row(klass, row, index_start, max_depth=0, cur_depth=0,
|
||||
requested=None):
|
||||
requested=None):
|
||||
"""
|
||||
Helper function that recursively returns an object with the specified
|
||||
related attributes already populated.
|
||||
|
|
@ -774,6 +792,7 @@ def get_cached_row(klass, row, index_start, max_depth=0, cur_depth=0,
|
|||
setattr(obj, f.get_cache_name(), rel_obj)
|
||||
return obj, index_end
|
||||
|
||||
|
||||
def delete_objects(seen_objs):
|
||||
"""
|
||||
Iterate through a list of seen classes, and remove any instances that are
|
||||
|
|
@ -782,10 +801,10 @@ def delete_objects(seen_objs):
|
|||
try:
|
||||
ordered_classes = seen_objs.keys()
|
||||
except CyclicDependency:
|
||||
# if there is a cyclic dependency, we cannot in general delete
|
||||
# the objects. However, if an appropriate transaction is set
|
||||
# up, or if the database is lax enough, it will succeed.
|
||||
# So for now, we go ahead and try anway.
|
||||
# If there is a cyclic dependency, we cannot in general delete the
|
||||
# objects. However, if an appropriate transaction is set up, or if the
|
||||
# database is lax enough, it will succeed. So for now, we go ahead and
|
||||
# try anyway.
|
||||
ordered_classes = seen_objs.unordered_keys()
|
||||
|
||||
obj_pairs = {}
|
||||
|
|
@ -794,7 +813,7 @@ def delete_objects(seen_objs):
|
|||
items.sort()
|
||||
obj_pairs[cls] = items
|
||||
|
||||
# Pre notify all instances to be deleted
|
||||
# Pre-notify all instances to be deleted.
|
||||
for pk_val, instance in items:
|
||||
dispatcher.send(signal=signals.pre_delete, sender=cls,
|
||||
instance=instance)
|
||||
|
|
@ -808,7 +827,7 @@ def delete_objects(seen_objs):
|
|||
if field.rel and field.null and field.rel.to in seen_objs:
|
||||
update_query.clear_related(field, pk_list)
|
||||
|
||||
# Now delete the actual data
|
||||
# Now delete the actual data.
|
||||
for cls in ordered_classes:
|
||||
items = obj_pairs[cls]
|
||||
items.reverse()
|
||||
|
|
@ -831,6 +850,7 @@ def delete_objects(seen_objs):
|
|||
|
||||
transaction.commit_unless_managed()
|
||||
|
||||
|
||||
def insert_query(model, values, return_id=False, raw_values=False):
|
||||
"""
|
||||
Inserts a new record for the given model. This provides an interface to
|
||||
|
|
@ -840,4 +860,3 @@ def insert_query(model, values, return_id=False, raw_values=False):
|
|||
query = sql.InsertQuery(model, connection)
|
||||
query.insert_values(values, raw_values)
|
||||
return query.execute_sql(return_id)
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue