def save_base(self, raw=False, cls=None, origin=None, force_insert=False,
force_update=False, using=None):
"""
Does the heavy-lifting involved in saving. Subclasses shouldn't need to
override this method. It's separate from save() in order to hide the
need for overrides of save() to pass around internal-only parameters
('raw', 'cls', and 'origin').
"""
using = using or router.db_for_write(self.__class__, instance=self)
connection = connections[using]
assert not (force_insert and force_update)
if cls is None:
cls = self.__class__
meta = cls._meta
if not meta.proxy:
origin = cls
else:
meta = cls._meta
if origin and not meta.auto_created:
signals.pre_save.send(sender=origin, instance=self, raw=raw)
# If we are in a raw save, save the object exactly as presented.
# That means that we don't try to be smart about saving attributes
# that might have come from the parent class - we just save the
# attributes we have been given to the class we have been given.
# We also go through this process to defer the save of proxy objects
# to their actual underlying model.
if not raw or meta.proxy:
if meta.proxy:
org = cls
else:
org = None
for parent, field in meta.parents.items():
# At this point, parent's primary key field may be unknown
# (for example, from administration form which doesn't fill
# this field). If so, fill it.
if field and getattr(self, parent._meta.pk.attname) is None and getattr(self, field.attname) is not None:
setattr(self, parent._meta.pk.attname, getattr(self, field.attname))
self.save_base(cls=parent, origin=org, using=using)
if field:
setattr(self, field.attname, self._get_pk_val(parent._meta))
if meta.proxy:
return
if not meta.proxy:
non_pks = [f for f in meta.local_fields if not f.primary_key]
# First, try an UPDATE. If that doesn't update anything, do an INSERT.
pk_val = self._get_pk_val(meta)
pk_set = pk_val is not None
record_exists = True
manager = cls._base_manager
if pk_set:
# Determine whether a record with the primary key already exists.
if (force_update or (not force_insert and
manager.using(using).filter(pk=pk_val).exists())):
# It does already exist, so do an UPDATE.
if force_update or non_pks:
values = [(f, None, (raw and getattr(self, f.attname) or f.pre_save(self, False))) for f in non_pks]
rows = manager.using(using).filter(pk=pk_val)._update(values)
if force_update and not rows:
raise DatabaseError("Forced update did not affect any rows.")
else:
record_exists = False
if not pk_set or not record_exists:
if meta.order_with_respect_to:
# If this is a model with an order_with_respect_to
# autopopulate the _order field
field = meta.order_with_respect_to
order_value = manager.using(using).filter(**{field.name: getattr(self, field.attname)}).count()
setattr(self, '_order', order_value)
if not pk_set:
if force_update:
raise ValueError("Cannot force an update in save() with no primary key.")
values = [(f, f.get_db_prep_save(raw and getattr(self, f.attname) or f.pre_save(self, True), connection=connection))
for f in meta.local_fields if not isinstance(f, AutoField)]
else:
values = [(f, f.get_db_prep_save(raw and getattr(self, f.attname) or f.pre_save(self, True), connection=connection))
for f in meta.local_fields]
record_exists = False
update_pk = bool(meta.has_auto_field and not pk_set)
if values:
# Create a new record.
result = manager._insert(values, return_id=update_pk, using=using)
else:
# Create a new record with defaults for everything.
result = manager._insert([(meta.pk, connection.ops.pk_default_value())], return_id=update_pk, raw_values=True, using=using)
if update_pk:
setattr(self, meta.pk.attname, result)
transaction.commit_unless_managed(using=using)
# Store the database on which the object was saved
self._state.db = using
# Once saved, this is no longer a to-be-added instance.
self._state.adding = False
# Signal that the save is complete
if origin and not meta.auto_created:
signals.post_save.send(sender=origin, instance=self,
created=(not record_exists), raw=raw)
def save_base(self,
raw=False,
cls=None,
origin=None,
force_insert=False,
force_update=False,
using=None):
"""
Does the heavy-lifting involved in saving. Subclasses shouldn't need to
override this method. It's separate from save() in order to hide the
need for overrides of save() to pass around internal-only parameters
('raw', 'cls', and 'origin').
"""
using = using or router.db_for_write(self.__class__, instance=self)
assert not (force_insert and force_update)
if cls is None:
cls = self.__class__
meta = cls._meta
if not meta.proxy:
origin = cls
else:
meta = cls._meta
if origin and not meta.auto_created:
signals.pre_save.send(sender=origin,
instance=self,
raw=raw,
using=using)
# If we are in a raw save, save the object exactly as presented.
# That means that we don't try to be smart about saving attributes
# that might have come from the parent class - we just save the
# attributes we have been given to the class we have been given.
# We also go through this process to defer the save of proxy objects
# to their actual underlying model.
if not raw or meta.proxy:
if meta.proxy:
org = cls
else:
org = None
for parent, field in meta.parents.items():
# At this point, parent's primary key field may be unknown
# (for example, from administration form which doesn't fill
# this field). If so, fill it.
if field and getattr(
self, parent._meta.pk.attname) is None and getattr(
self, field.attname) is not None:
setattr(self, parent._meta.pk.attname,
getattr(self, field.attname))
self.save_base(cls=parent, origin=org, using=using)
if field:
setattr(self, field.attname,
self._get_pk_val(parent._meta))
if meta.proxy:
return
if not meta.proxy:
non_pks = [f for f in meta.local_fields if not f.primary_key]
# First, try an UPDATE. If that doesn't update anything, do an INSERT.
pk_val = self._get_pk_val(meta)
pk_set = pk_val is not None
record_exists = True
manager = cls._base_manager
if pk_set:
# Determine whether a record with the primary key already exists.
if (force_update or
(not force_insert
and manager.using(using).filter(pk=pk_val).exists())):
# It does already exist, so do an UPDATE.
if force_update or non_pks:
values = [(f, None, (raw and getattr(self, f.attname)
or f.pre_save(self, False)))
for f in non_pks]
if values:
rows = manager.using(using).filter(
pk=pk_val)._update(values)
if force_update and not rows:
raise DatabaseError(
"Forced update did not affect any rows.")
else:
record_exists = False
if not pk_set or not record_exists:
if meta.order_with_respect_to:
# If this is a model with an order_with_respect_to
# autopopulate the _order field
field = meta.order_with_respect_to
order_value = manager.using(using).filter(
**{
field.name: getattr(self, field.attname)
}).count()
self._order = order_value
fields = meta.local_fields
if not pk_set:
if force_update:
raise ValueError(
"Cannot force an update in save() with no primary key."
)
fields = [
f for f in fields if not isinstance(f, AutoField)
]
record_exists = False
update_pk = bool(meta.has_auto_field and not pk_set)
result = manager._insert([self],
fields=fields,
return_id=update_pk,
using=using,
raw=raw)
if update_pk:
setattr(self, meta.pk.attname, result)
transaction.commit_unless_managed(using=using)
# Store the database on which the object was saved
self._state.db = using
# Once saved, this is no longer a to-be-added instance.
self._state.adding = False
# Signal that the save is complete
if origin and not meta.auto_created:
signals.post_save.send(sender=origin,
instance=self,
created=(not record_exists),
raw=raw,
using=using)
def save_base(self, raw=False, cls=None, origin=None, force_insert=False,
force_update=False, using=None, update_fields=None):
"""
Does the heavy-lifting involved in saving. Subclasses shouldn't need to
override this method. It's separate from save() in order to hide the
need for overrides of save() to pass around internal-only parameters
('raw', 'cls', and 'origin').
"""
using = using or router.db_for_write(self.__class__, instance=self)
assert not (force_insert and (force_update or update_fields))
assert update_fields is None or len(update_fields) > 0
if cls is None:
cls = self.__class__
meta = cls._meta
if not meta.proxy:
origin = cls
else:
meta = cls._meta
if origin and not meta.auto_created:
signals.pre_save.send(sender=origin, instance=self, raw=raw, using=using,
update_fields=update_fields)
# If we are in a raw save, save the object exactly as presented.
# That means that we don't try to be smart about saving attributes
# that might have come from the parent class - we just save the
# attributes we have been given to the class we have been given.
# We also go through this process to defer the save of proxy objects
# to their actual underlying model.
if not raw or meta.proxy:
if meta.proxy:
org = cls
else:
org = None
for parent, field in meta.parents.items():
# At this point, parent's primary key field may be unknown
# (for example, from administration form which doesn't fill
# this field). If so, fill it.
if field and getattr(self, parent._meta.pk.attname) is None and getattr(self, field.attname) is not None:
setattr(self, parent._meta.pk.attname, getattr(self, field.attname))
self.save_base(cls=parent, origin=org, using=using,
update_fields=update_fields)
if field:
setattr(self, field.attname, self._get_pk_val(parent._meta))
# Since we didn't have an instance of the parent handy, we
# set attname directly, bypassing the descriptor.
# Invalidate the related object cache, in case it's been
# accidentally populated. A fresh instance will be
# re-built from the database if necessary.
cache_name = field.get_cache_name()
if hasattr(self, cache_name):
delattr(self, cache_name)
if meta.proxy:
return
if not meta.proxy:
non_pks = [f for f in meta.local_fields if not f.primary_key]
if update_fields:
non_pks = [f for f in non_pks if f.name in update_fields or f.attname in update_fields]
# First, try an UPDATE. If that doesn't update anything, do an INSERT.
pk_val = self._get_pk_val(meta)
pk_set = pk_val is not None
record_exists = True
manager = cls._base_manager
if pk_set:
# Determine if we should do an update (pk already exists, forced update,
# no force_insert)
if ((force_update or update_fields) or (not force_insert and
manager.using(using).filter(pk=pk_val).exists())):
if force_update or non_pks:
values = [(f, None, (raw and getattr(self, f.attname) or f.pre_save(self, False))) for f in non_pks]
if values:
rows = manager.using(using).filter(pk=pk_val)._update(values)
if force_update and not rows:
raise DatabaseError("Forced update did not affect any rows.")
if update_fields and not rows:
raise DatabaseError("Save with update_fields did not affect any rows.")
else:
record_exists = False
if not pk_set or not record_exists:
if meta.order_with_respect_to:
# If this is a model with an order_with_respect_to
# autopopulate the _order field
field = meta.order_with_respect_to
order_value = manager.using(using).filter(**{field.name: getattr(self, field.attname)}).count()
self._order = order_value
fields = meta.local_fields
if not pk_set:
if force_update or update_fields:
raise ValueError("Cannot force an update in save() with no primary key.")
fields = [f for f in fields if not isinstance(f, AutoField)]
record_exists = False
update_pk = bool(meta.has_auto_field and not pk_set)
result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw)
if update_pk:
setattr(self, meta.pk.attname, result)
transaction.commit_unless_managed(using=using)
# Store the database on which the object was saved
self._state.db = using
# Once saved, this is no longer a to-be-added instance.
self._state.adding = False
# Signal that the save is complete
if origin and not meta.auto_created:
signals.post_save.send(sender=origin, instance=self, created=(not record_exists),
update_fields=update_fields, raw=raw, using=using)
def save_base(self, raw=False, cls=None, origin=None, force_insert=False,
force_update=False, using=None):
"""
Does the heavy-lifting involved in saving. Subclasses shouldn't need to
override this method. It's separate from save() in order to hide the
need for overrides of save() to pass around internal-only parameters
('raw', 'cls', and 'origin').
"""
using = using or router.db_for_write(self.__class__, instance=self)
entity_exists = bool(not self._state.adding and self._original_pk == self.pk)
assert not (force_insert and force_update)
if cls is None:
cls = self.__class__
meta = cls._meta
if not meta.proxy:
origin = cls
else:
meta = cls._meta
if origin and not meta.auto_created:
signals.pre_save.send(sender=origin, instance=self, raw=raw, using=using)
# If we are in a raw save, save the object exactly as presented.
# That means that we don't try to be smart about saving attributes
# that might have come from the parent class - we just save the
# attributes we have been given to the class we have been given.
# We also go through this process to defer the save of proxy objects
# to their actual underlying model.
if not raw or meta.proxy:
if meta.proxy:
org = cls
else:
org = None
for parent, field in meta.parents.items():
# At this point, parent's primary key field may be unknown
# (for example, from administration form which doesn't fill
# this field). If so, fill it.
if field and getattr(self, parent._meta.pk.attname) is None and getattr(self, field.attname) is not None:
setattr(self, parent._meta.pk.attname, getattr(self, field.attname))
self.save_base(cls=parent, origin=org, using=using)
if field:
setattr(self, field.attname, self._get_pk_val(parent._meta))
if meta.proxy:
return
if not meta.proxy:
non_pks = [f for f in meta.local_fields if not f.primary_key]
# First, try an UPDATE. If that doesn't update anything, do an INSERT.
pk_val = self._get_pk_val(meta)
pk_set = pk_val is not None
record_exists = True
manager = cls._base_manager
connection = connections[using]
# TODO/NONREL: Some backends could emulate force_insert/_update
# with an optimistic transaction, but since it's costly we should
# only do it when the user explicitly wants it.
# By adding support for an optimistic locking transaction
# in Django (SQL: SELECT ... FOR UPDATE) we could even make that
# part fully reusable on all backends (the current .exists()
# check below isn't really safe if you have lots of concurrent
# requests. BTW, and neither is QuerySet.get_or_create).
try_update = connection.features.distinguishes_insert_from_update
if not try_update:
record_exists = False
if try_update and pk_set:
# Determine whether a record with the primary key already exists.
if (force_update or (not force_insert and
manager.using(using).filter(pk=pk_val).exists())):
# It does already exist, so do an UPDATE.
if force_update or non_pks:
values = [(f, None, (raw and getattr(self, f.attname) or f.pre_save(self, False))) for f in non_pks]
if values:
rows = manager.using(using).filter(pk=pk_val)._update(values)
if force_update and not rows:
raise DatabaseError("Forced update did not affect any rows.")
else:
record_exists = False
if not pk_set or not record_exists:
if meta.order_with_respect_to:
# If this is a model with an order_with_respect_to
# autopopulate the _order field
field = meta.order_with_respect_to
order_value = manager.using(using).filter(**{field.name: getattr(self, field.attname)}).count()
self._order = order_value
fields = meta.local_fields
if not pk_set:
if force_update:
raise ValueError("Cannot force an update in save() with no primary key.")
fields = [f for f in fields if not isinstance(f, AutoField)]
record_exists = False
update_pk = bool(meta.has_auto_field and not pk_set)
result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw)
if update_pk:
setattr(self, meta.pk.attname, result)
transaction.commit_unless_managed(using=using)
# Store the database on which the object was saved
self._state.db = using
# Once saved, this is no longer a to-be-added instance.
self._state.adding = False
self._original_pk = self.pk
# Signal that the save is complete
if origin and not meta.auto_created:
if connection.features.distinguishes_insert_from_update:
created = not record_exists
else:
created = not entity_exists
signals.post_save.send(sender=origin, instance=self,
created=created, raw=raw, using=using)
def save_base(self,
raw=False,
cls=None,
origin=None,
force_insert=False,
force_update=False,
using=None):
"""
Does the heavy-lifting involved in saving. Subclasses shouldn't need to
override this method. It's separate from save() in order to hide the
need for overrides of save() to pass around internal-only parameters
('raw', 'cls', and 'origin').
"""
using = using or router.db_for_write(self.__class__, instance=self)
connection = connections[using]
assert not (force_insert and force_update)
if cls is None:
cls = self.__class__
meta = cls._meta
if not meta.proxy:
origin = cls
else:
meta = cls._meta
if origin and not meta.auto_created:
signals.pre_save.send(sender=origin,
instance=self,
raw=raw,
using=using)
# If we are in a raw save, save the object exactly as presented.
# That means that we don't try to be smart about saving attributes
# that might have come from the parent class - we just save the
# attributes we have been given to the class we have been given.
# We also go through this process to defer the save of proxy objects
# to their actual underlying model.
if not raw or meta.proxy:
if meta.proxy:
org = cls
else:
org = None
for parent, field in meta.parents.items():
# At this point, parent's primary key field may be unknown
# (for example, from administration form which doesn't fill
# this field). If so, fill it.
if field and getattr(
self, parent._meta.pk.attname) is None and getattr(
self, field.attname) is not None:
setattr(self, parent._meta.pk.attname,
getattr(self, field.attname))
self.save_base(cls=parent, origin=org, using=using)
if field:
setattr(self, field.attname,
self._get_pk_val(parent._meta))
if meta.proxy:
return
if not meta.proxy:
non_pks = [f for f in meta.local_fields if not f.primary_key]
# First, try an UPDATE. If that doesn't update anything, do an INSERT.
pk_val = self._get_pk_val(meta)
pk_set = pk_val is not None
record_exists = True
manager = cls._base_manager
# TODO/NONREL: Some backends could emulate force_insert/_update
# with an optimistic transaction, but since it's costly we should
# only do it when the user explicitly wants it.
# By adding support for an optimistic locking transaction
# in Django (SQL: SELECT ... FOR UPDATE) we could even make that
# part fully reusable on all backends (the current .exists()
# check below isn't really safe if you have lots of concurrent
# requests. BTW, and neither is QuerySet.get_or_create).
try_update = connection.features.distinguishes_insert_from_update
if not try_update:
record_exists = False
if try_update and pk_set:
# Determine whether a record with the primary key already exists.
if (force_update or
(not force_insert
and manager.using(using).filter(pk=pk_val).exists())):
# It does already exist, so do an UPDATE.
if force_update or non_pks:
values = [(f, None, (raw and getattr(self, f.attname)
or f.pre_save(self, False)))
for f in non_pks]
rows = manager.using(using).filter(
pk=pk_val)._update(values)
if force_update and not rows:
raise DatabaseError(
"Forced update did not affect any rows.")
else:
record_exists = False
if not pk_set or not record_exists:
if meta.order_with_respect_to:
# If this is a model with an order_with_respect_to
# autopopulate the _order field
field = meta.order_with_respect_to
order_value = manager.using(using).filter(
**{
field.name: getattr(self, field.attname)
}).count()
self._order = order_value
if not pk_set:
if force_update:
raise ValueError(
"Cannot force an update in save() with no primary key."
)
values = [
(f,
f.get_db_prep_save(raw and getattr(self, f.attname)
or f.pre_save(self, True),
connection=connection))
for f in meta.local_fields
if not isinstance(f, AutoField)
]
else:
values = [
(f,
f.get_db_prep_save(raw and getattr(self, f.attname)
or f.pre_save(self, True),
connection=connection))
for f in meta.local_fields
]
record_exists = False
update_pk = bool(meta.has_auto_field and not pk_set)
if values:
# Create a new record.
result = manager._insert(values,
return_id=update_pk,
using=using)
else:
# Create a new record with defaults for everything.
result = manager._insert(
[(meta.pk, connection.ops.pk_default_value())],
return_id=update_pk,
raw_values=True,
using=using)
if update_pk:
setattr(self, meta.pk.attname, result)
transaction.commit_unless_managed(using=using)
# Store the database on which the object was saved
self._state.db = using
# Signal that the save is complete
if origin and not meta.auto_created:
signals.post_save.send(sender=origin,
instance=self,
created=(not record_exists),
raw=raw,
using=using)
non_pks = [f for f in meta.local_fields if not f.primary_key]
if update_fields:
non_pks = [f for f in non_pks if f.name in update_fields or f.attname in update_fields]
# First, try an UPDATE. If that doesn't update anything, do an INSERT.
pk_val = self._get_pk_val(meta) 直接获取主键的值
pk_set = pk_val is not None
record_exists = True
manager = cls._base_manager
if pk_set: 如果存在主键, 则执行更新操作
# Determine if we should do an update (pk already exists, forced update,
# no force_insert)
if ((force_update or update_fields) or (not force_insert and
manager.using(using).filter(pk=pk_val).exists())):
if force_update or non_pks:
values = [(f, None, (raw and getattr(self, f.attname) or f.pre_save(self, False))) for f in non_pks]
if values:
rows = manager.using(using).filter(pk=pk_val)._update(values)
if force_update and not rows:
raise DatabaseError("Forced update did not affect any rows.")
if update_fields and not rows:
raise DatabaseError("Save with update_fields did not affect any rows.")
else:
record_exists = False
if not pk_set or not record_exists:
if meta.order_with_respect_to: