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���\c @ sT d Z d d l Z d d l m Z d d l m Z d d l m Z d d l m Z d d l m Z d d l m Z d d
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d d l m Z d d l m Z d d l m Z d d l m Z d d l m Z e j d e j f d � � Y� Z d e f d � � YZ d e f d � � YZ d S( s� Defines instrumentation of instances.
This module is usually not directly visible to user applications, but
defines a large part of the ORM's interactivity.
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d, � ZG d- � ZH d0 d. � ZI e. d0 d/ � � ZJ RS(4 s� tracks state information at the instance level.
The :class:`.InstanceState` is a key object used by the
SQLAlchemy ORM in order to track the state of an object;
it is created the moment an object is instantiated, typically
as a result of :term:`instrumentation` which SQLAlchemy applies
to the ``__init__()`` method of the class.
:class:`.InstanceState` is also a semi-public object,
available for runtime inspection as to the state of a
mapped instance, including information such as its current
status within a particular :class:`.Session` and details
about data on individual attributes. The public API
in order to acquire a :class:`.InstanceState` object
is to use the :func:`.inspect` system::
>>> from sqlalchemy import inspect
>>> insp = inspect(some_mapped_object)
.. seealso::
:ref:`core_inspection_toplevel`
c C sF | j | _ | | _ t j | | j � | _ i | _ t � | _ d S( N(
t __class__t class_t managert weakreft reft _cleanupt objt committed_statet sett expired_attributes( t selfR R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt __init__Y s
c s& t j t � f d � � j D� � � S( sa Return a namespace representing each attribute on
the mapped object, including its current value
and history.
The returned object is an instance of :class:`.AttributeState`.
This object allows inspection of the current data
within an attribute as well as attribute history
since the last flush.
c 3 s$ | ] } | t � | � f Vq d S( N( t AttributeState( t .0t key( R ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pys <genexpr>u s ( R
t ImmutablePropertiest dictR ( R ( ( R s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt attrsh s c C s | j d k o | j S( sy Return true if the object is :term:`transient`.
.. seealso::
:ref:`session_object_states`
N( R t Nonet _attached( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt transientx s c C s | j d k o | j S( sx Return true if the object is :term:`pending`.
.. seealso::
:ref:`session_object_states`
N( R R! R" ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt pending� s
c C s | j d k o | j o | j S( s� Return true if the object is :term:`deleted`.
An object that is in the deleted state is guaranteed to
not be within the :attr:`.Session.identity_map` of its parent
:class:`.Session`; however if the session's transaction is rolled
back, the object will be restored to the persistent state and
the identity map.
.. note::
The :attr:`.InstanceState.deleted` attribute refers to a specific
state of the object that occurs between the "persistent" and
"detached" states; once the object is :term:`detached`, the
:attr:`.InstanceState.deleted` attribute **no longer returns
True**; in order to detect that a state was deleted, regardless
of whether or not the object is associated with a
:class:`.Session`, use the :attr:`.InstanceState.was_deleted`
accessor.
.. versionadded: 1.1
.. seealso::
:ref:`session_object_states`
N( R R! R" t _deleted( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt deleted� s c C s | j S( s� Return True if this object is or was previously in the
"deleted" state and has not been reverted to persistent.
This flag returns True once the object was deleted in flush.
When the object is expunged from the session either explicitly
or via transaction commit and enters the "detached" state,
this flag will continue to report True.
.. versionadded:: 1.1 - added a local method form of
:func:`.orm.util.was_deleted`.
.. seealso::
:attr:`.InstanceState.deleted` - refers to the "deleted" state
:func:`.orm.util.was_deleted` - standalone function
:ref:`session_object_states`
( R% ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt was_deleted� s c C s | j d k o | j o | j S( s{ Return true if the object is :term:`persistent`.
An object that is in the persistent state is guaranteed to
be within the :attr:`.Session.identity_map` of its parent
:class:`.Session`.
.. versionchanged:: 1.1 The :attr:`.InstanceState.persistent`
accessor no longer returns True for an object that was
"deleted" within a flush; use the :attr:`.InstanceState.deleted`
accessor to detect this state. This allows the "persistent"
state to guarantee membership in the identity map.
.. seealso::
:ref:`session_object_states`
N( R R! R" R% ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt
persistent� s c C s | j d k o | j S( sx Return true if the object is :term:`detached`.
.. seealso::
:ref:`session_object_states`
N( R R! R" ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt detached� s s sqlalchemy.orm.sessionc C s | j d k o | j | j k S( N( t
session_idR! t _sessions( R t
sessionlib( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyR" � s c C s5 | | j k r1 t | j � | _ t | j | <n d S( s| Track the last known value of a particular key after expiration
operations.
.. versionadded:: 1.3
N( t _last_known_valuesR R ( R R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt _track_last_known_value� s c C s
| j | � S( s Return the owning :class:`.Session` for this instance,
or ``None`` if none available.
Note that the result here can in some cases be *different*
from that of ``obj in session``; an object that's been deleted
will report as not ``in session``, however if the transaction is
still in progress, this attribute will still refer to that session.
Only when the transaction is completed does the object become
fully detached under normal circumstances.
( t _state_session( R R, ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt session� s c C s
| j � S( sM Return the mapped object represented by this
:class:`.InstanceState`.( R ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt object s c C s" | j d k r d S| j d Sd S( s� Return the mapped identity of the mapped object.
This is the primary key identity as persisted by the ORM
which can always be passed directly to
:meth:`.Query.get`.
Returns ``None`` if the object has no primary key identity.
.. note::
An object which is :term:`transient` or :term:`pending`
does **not** have a mapped identity until it is flushed,
even if its attributes include primary key values.
i N( R R! ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt identity s c C s | j S( s� Return the identity key for the mapped object.
This is the key used to locate the object within
the :attr:`.Session.identity_map` mapping. It contains
the identity as returned by :attr:`.identity` within it.
( R ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt identity_key# s c C s i S( N( ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt parents1 s c C s i S( N( ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt _pending_mutations5 s c C s
| j j S( s8 Return the :class:`.Mapper` used for this mapped object.( R t mapper( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyR6 9 s c C s
t | j � S( s� Return ``True`` if this object has an identity key.
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expression ``state.persistent or state.detached``.
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c C sX t d k r d S| j � } | d k r> | j | � | ` n d | _ | _ | ` d S( s� Weakref callback cleanup.
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Will not work otherwise!
N( R R! t _instance_dictt
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Under normal circumstances, this is always synonymous
with the ``__dict__`` attribute of the mapped object,
unless an alternative instrumentation system has been
configured.
In the case that the actual object has been garbage
collected, this accessor returns a blank dictionary.
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c C s~ | j | d � } | d k rK | j | j j rK | j | j j | � n | j j | � | j rz | j j | d � n d S( sK Remove the given attribute and any
callables associated with it.N( t popR! R RR t
collectiont _invalidate_collectionR t discardR\ ( R t dict_R t old( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt _reset s c C s( d | j k r$ t | j � | _ n d S( NR\ ( RX R R\ ( R t from_( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt _copy_callables% s c sD | � j � � j r. � � � f d � } n � � f d � } | S( Nc sZ d | j k r i | _ n | j � d � } | d k rI � j | � n � | j � <d S( NR\ ( RX R\ Rq R! Rs ( RA Ru t rowRv ( t fnRR R ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt
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c C sG | t @s t S| j j | j � } | j j | | � | j j � t S( s� __call__ allows the InstanceState to act as a deferred
callable for loading expired attributes, which is also
serializable (picklable).
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c C s t | j � j | j � S( s8 Return the set of keys which have no uncommitted changes( R R t
differenceR ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyR� � s c C s" t | � j | j � j | j � S( s* Return self.unmodified.intersection(keys).( R R� R R� R ( R t keys( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt unmodified_intersection� s c C s% t | j � j | j � j | j � S( s� Return the set of keys which do not have a loaded value.
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was never populated or modified.
c 3 s( | ] } � j | j j r | Vq d S( N( R RR R� ( R t attr( R ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pys <genexpr>� s ( R� R� R ( R ( ( R s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt unloaded_expirable� s c s# � j j � f d � � j D� � S( Nc 3 s( | ] } � j | j j r | Vq d S( N( R RR R� ( R R� ( R ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pys <genexpr>� s ( R� R� R ( R ( ( R s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt _unloaded_non_object� s c C s d S( N( R! ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyRE � s c
C s� | r� | j s d S| rA | j | k rA t j d | j � � n | j | j k sY | r� | r� | t k r� | j | k r� | | j } q� n | d t t f k r� | j | � } q� n | | j | j <n | j | j k r� t | j | j <q� n | j
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rc| | _ n | d k r�| r�t j d | j | j t j | � f � � q�n d S( NsH Can't flag attribute '%s' modified; it's not present in the object statesa Can't emit change event for attribute '%s' - parent object of type %s has been garbage collected.( t send_modified_eventsR t sa_exct InvalidRequestErrorR R R! R t copyR- R* R> RZ R RE t _modifiedRi R t orm_exct ObjectDereferencedErrorR R t state_class_str( R Ru R� t previousRr t is_userlandRG Ro ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt _modified_event� s: " c C s� x! | D] } | j j | d � q Wt | _ | j j t | � j | � � | j r� x6 t | j � j | � j | � D] } | j | =qw Wn d S( s8 Commit attributes.
This is used by a partial-attribute load operation to mark committed
those attributes which were refreshed from the database.
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this step if a value was not populated in state.dict.
N(
R Rq R! Rf R[ R t difference_updateR R� R\ ( R Ru R� R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt _commit s
%c C s | j | | f g | � d S( sS commit all attributes unconditionally.
This is used after a flush() or a full load/refresh
to remove all pending state from the instance.
- all attributes are marked as "committed"
- the "strong dirty reference" is removed
- the "modified" flag is set to False
- any "expired" markers for scalar attributes loaded are removed.
- lazy load callables for objects / collections *stay*
Attributes marked as "expired" can potentially remain
"expired" after this step if a value was not populated in state.dict.
N( t _commit_all_states( R Ru RG ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt _commit_all s c C s� x� | D]� \ } } | j } | j j � d | k r? | d =n | j j | � | rq | j rq | j j | � n t | _ | _ d | _ q Wd S( s. Mass / highly inlined version of commit_all().R5 N( RX R R� R R� RZ R� Rt Rf R[ R! R> ( R t iter_RG RA Ru Rc ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyR� 2 s
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_load_pendingt _orphaned_outside_of_sessionR t is_instanceRj R- R\ R R t memoized_propertyR t propertyR# R$ R& R' R( R) t dependenciesR" R. R0 R1 R2 R3 R4 R5 R6 R8 t classmethodRB RC RD R R R RQ RS RU RW Rd Rp Rw Ry R~ R� R� R� R� R� R� R� R� RE R� R� R� R� ( ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyR " s�
( : * . R c B sM e Z d Z d � Z e d � � Z e d � � Z e d � � Z d � Z RS( s� Provide an inspection interface corresponding
to a particular attribute on a particular mapped object.
The :class:`.AttributeState` object is accessed
via the :attr:`.InstanceState.attrs` collection
of a particular :class:`.InstanceState`::
from sqlalchemy import inspect
insp = inspect(some_mapped_object)
attr_state = insp.attrs.some_attribute
c C s | | _ | | _ d S( N( RA R ( R RA R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyR V s c C s | j j j | j t � S( s� The current value of this attribute as loaded from the database.
If the value has not been loaded, or is otherwise not present
in the object's dictionary, returns NO_VALUE.
( RA R Re R R ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt loaded_valueZ s c C s, | j j | j j | j j � | j j � S( s� Return the value of this attribute.
This operation is equivalent to accessing the object's
attribute directly or via ``getattr()``, and will fire
off any pending loader callables if needed.
( RA R R t __get__R R ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt valued s c C s | j j | j t � S( sX Return the current **pre-flush** change history for
this attribute, via the :class:`.History` interface.
This method will **not** emit loader callables if the value of the
attribute is unloaded.
.. note::
The attribute history system tracks changes on a **per flush
basis**. Each time the :class:`.Session` is flushed, the history
of each attribute is reset to empty. The :class:`.Session` by
default autoflushes each time a :class:`.Query` is invoked. For
options on how to control this, see :ref:`session_flushing`.
.. seealso::
:meth:`.AttributeState.load_history` - retrieve history
using loader callables if the value is not locally present.
:func:`.attributes.get_history` - underlying function
( RA RS R R ( R ( ( s: /usr/lib64/python2.7/site-packages/sqlalchemy/orm/state.pyt historyq s c C s | j j | j t t A� S( s Return the current **pre-flush** change history for
this attribute, via the :class:`.History` interface.
This method **will** emit loader callables if the value of the
attribute is unloaded.
.. note::
The attribute history system tracks changes on a **per flush
basis**. Each time the :class:`.Session` is flushed, the history
of each attribute is reset to empty. The :class:`.Session` by
default autoflushes each time a :class:`.Query` is invoked. For
options on how to control this, see :ref:`session_flushing`.
.. seealso::
:attr:`.AttributeState.history`
:func:`.attributes.get_history` - underlying function
.. versionadded:: 0.9.0
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