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Defines the :class:`~sqlalchemy.orm.mapper.Mapper` class, the central
configurational unit which associates a class with a database table.
This is a semi-private module; the main configurational API of the ORM is
available in :class:`~sqlalchemy.orm.`.
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columns.
The :class:`.Mapper` object is instantiated using the
:func:`~sqlalchemy.orm.mapper` function. For information
about instantiating new :class:`.Mapper` objects, see
that function's documentation.
When :func:`.mapper` is used
explicitly to link a user defined class with table
metadata, this is referred to as *classical mapping*.
Modern SQLAlchemy usage tends to favor the
:mod:`sqlalchemy.ext.declarative` extension for class
configuration, which
makes usage of :func:`.mapper` behind the scenes.
Given a particular class known to be mapped by the ORM,
the :class:`.Mapper` which maintains it can be acquired
using the :func:`.inspect` function::
from sqlalchemy import inspect
mapper = inspect(MyClass)
A class which was mapped by the :mod:`sqlalchemy.ext.declarative`
extension will also have its mapper available via the ``__mapper__``
attribute.
t extensions 0.7s� :class:`.MapperExtension` is deprecated in favor of the :class:`.MapperEvents` listener interface. The :paramref:`.mapper.extension` parameter will be removed in a future release.t order_bys 1.1s� The :paramref:`.mapper.order_by` parameter is deprecated, and will be removed in a future release. Use :meth:`.Query.order_by` to determine the ordering of a result set.t non_primarys 1.3s The :paramref:`.mapper.non_primary` parameter is deprecated, and will be removed in a future release. The functionality of non primary mappers is now better suited using the :class:`.AliasedClass` construct, which can also be used as the target of a :func:`.relationship` in 1.3.id c C@ s_ t j | t d � | _ t | _ t j | � | _ | | _ |
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This function is typically used behind the scenes
via the Declarative extension. When using Declarative,
many of the usual :func:`.mapper` arguments are handled
by the Declarative extension itself, including ``class_``,
``local_table``, ``properties``, and ``inherits``.
Other options are passed to :func:`.mapper` using
the ``__mapper_args__`` class variable::
class MyClass(Base):
__tablename__ = 'my_table'
id = Column(Integer, primary_key=True)
type = Column(String(50))
alt = Column("some_alt", Integer)
__mapper_args__ = {
'polymorphic_on' : type
}
Explicit use of :func:`.mapper`
is often referred to as *classical mapping*. The above
declarative example is equivalent in classical form to::
my_table = Table("my_table", metadata,
Column('id', Integer, primary_key=True),
Column('type', String(50)),
Column("some_alt", Integer)
)
class MyClass(object):
pass
mapper(MyClass, my_table,
polymorphic_on=my_table.c.type,
properties={
'alt':my_table.c.some_alt
})
.. seealso::
:ref:`classical_mapping` - discussion of direct usage of
:func:`.mapper`
:param class\_: The class to be mapped. When using Declarative,
this argument is automatically passed as the declared class
itself.
:param local_table: The :class:`.Table` or other selectable
to which the class is mapped. May be ``None`` if
this mapper inherits from another mapper using single-table
inheritance. When using Declarative, this argument is
automatically passed by the extension, based on what
is configured via the ``__table__`` argument or via the
:class:`.Table` produced as a result of the ``__tablename__``
and :class:`.Column` arguments present.
:param always_refresh: If True, all query operations for this mapped
class will overwrite all data within object instances that already
exist within the session, erasing any in-memory changes with
whatever information was loaded from the database. Usage of this
flag is highly discouraged; as an alternative, see the method
:meth:`.Query.populate_existing`.
:param allow_partial_pks: Defaults to True. Indicates that a
composite primary key with some NULL values should be considered as
possibly existing within the database. This affects whether a
mapper will assign an incoming row to an existing identity, as well
as if :meth:`.Session.merge` will check the database first for a
particular primary key value. A "partial primary key" can occur if
one has mapped to an OUTER JOIN, for example.
:param batch: Defaults to ``True``, indicating that save operations
of multiple entities can be batched together for efficiency.
Setting to False indicates
that an instance will be fully saved before saving the next
instance. This is used in the extremely rare case that a
:class:`.MapperEvents` listener requires being called
in between individual row persistence operations.
:param column_prefix: A string which will be prepended
to the mapped attribute name when :class:`.Column`
objects are automatically assigned as attributes to the
mapped class. Does not affect explicitly specified
column-based properties.
See the section :ref:`column_prefix` for an example.
:param concrete: If True, indicates this mapper should use concrete
table inheritance with its parent mapper.
See the section :ref:`concrete_inheritance` for an example.
:param confirm_deleted_rows: defaults to True; when a DELETE occurs
of one more rows based on specific primary keys, a warning is
emitted when the number of rows matched does not equal the number
of rows expected. This parameter may be set to False to handle the
case where database ON DELETE CASCADE rules may be deleting some of
those rows automatically. The warning may be changed to an
exception in a future release.
.. versionadded:: 0.9.4 - added
:paramref:`.mapper.confirm_deleted_rows` as well as conditional
matched row checking on delete.
:param eager_defaults: if True, the ORM will immediately fetch the
value of server-generated default values after an INSERT or UPDATE,
rather than leaving them as expired to be fetched on next access.
This can be used for event schemes where the server-generated values
are needed immediately before the flush completes. By default,
this scheme will emit an individual ``SELECT`` statement per row
inserted or updated, which note can add significant performance
overhead. However, if the
target database supports :term:`RETURNING`, the default values will
be returned inline with the INSERT or UPDATE statement, which can
greatly enhance performance for an application that needs frequent
access to just-generated server defaults.
.. seealso::
:ref:`orm_server_defaults`
.. versionchanged:: 0.9.0 The ``eager_defaults`` option can now
make use of :term:`RETURNING` for backends which support it.
:param exclude_properties: A list or set of string column names to
be excluded from mapping.
See :ref:`include_exclude_cols` for an example.
:param extension: A :class:`.MapperExtension` instance or
list of :class:`.MapperExtension` instances which will be applied
to all operations by this :class:`.Mapper`.
:param include_properties: An inclusive list or set of string column
names to map.
See :ref:`include_exclude_cols` for an example.
:param inherits: A mapped class or the corresponding :class:`.Mapper`
of one indicating a superclass to which this :class:`.Mapper`
should *inherit* from. The mapped class here must be a subclass
of the other mapper's class. When using Declarative, this argument
is passed automatically as a result of the natural class
hierarchy of the declared classes.
.. seealso::
:ref:`inheritance_toplevel`
:param inherit_condition: For joined table inheritance, a SQL
expression which will
define how the two tables are joined; defaults to a natural join
between the two tables.
:param inherit_foreign_keys: When ``inherit_condition`` is used and
the columns present are missing a :class:`.ForeignKey`
configuration, this parameter can be used to specify which columns
are "foreign". In most cases can be left as ``None``.
:param legacy_is_orphan: Boolean, defaults to ``False``.
When ``True``, specifies that "legacy" orphan consideration
is to be applied to objects mapped by this mapper, which means
that a pending (that is, not persistent) object is auto-expunged
from an owning :class:`.Session` only when it is de-associated
from *all* parents that specify a ``delete-orphan`` cascade towards
this mapper. The new default behavior is that the object is
auto-expunged when it is de-associated with *any* of its parents
that specify ``delete-orphan`` cascade. This behavior is more
consistent with that of a persistent object, and allows behavior to
be consistent in more scenarios independently of whether or not an
orphanable object has been flushed yet or not.
See the change note and example at :ref:`legacy_is_orphan_addition`
for more detail on this change.
:param non_primary: Specify that this :class:`.Mapper` is in addition
to the "primary" mapper, that is, the one used for persistence.
The :class:`.Mapper` created here may be used for ad-hoc
mapping of the class to an alternate selectable, for loading
only.
:paramref:`.Mapper.non_primary` is not an often used option, but
is useful in some specific :func:`.relationship` cases.
.. seealso::
:ref:`relationship_non_primary_mapper`
:param order_by: A single :class:`.Column` or list of :class:`.Column`
objects for which selection operations should use as the default
ordering for entities. By default mappers have no pre-defined
ordering.
:param passive_deletes: Indicates DELETE behavior of foreign key
columns when a joined-table inheritance entity is being deleted.
Defaults to ``False`` for a base mapper; for an inheriting mapper,
defaults to ``False`` unless the value is set to ``True``
on the superclass mapper.
When ``True``, it is assumed that ON DELETE CASCADE is configured
on the foreign key relationships that link this mapper's table
to its superclass table, so that when the unit of work attempts
to delete the entity, it need only emit a DELETE statement for the
superclass table, and not this table.
When ``False``, a DELETE statement is emitted for this mapper's
table individually. If the primary key attributes local to this
table are unloaded, then a SELECT must be emitted in order to
validate these attributes; note that the primary key columns
of a joined-table subclass are not part of the "primary key" of
the object as a whole.
Note that a value of ``True`` is **always** forced onto the
subclass mappers; that is, it's not possible for a superclass
to specify passive_deletes without this taking effect for
all subclass mappers.
.. versionadded:: 1.1
.. seealso::
:ref:`passive_deletes` - description of similar feature as
used with :func:`.relationship`
:paramref:`.mapper.passive_updates` - supporting ON UPDATE
CASCADE for joined-table inheritance mappers
:param passive_updates: Indicates UPDATE behavior of foreign key
columns when a primary key column changes on a joined-table
inheritance mapping. Defaults to ``True``.
When True, it is assumed that ON UPDATE CASCADE is configured on
the foreign key in the database, and that the database will handle
propagation of an UPDATE from a source column to dependent columns
on joined-table rows.
When False, it is assumed that the database does not enforce
referential integrity and will not be issuing its own CASCADE
operation for an update. The unit of work process will
emit an UPDATE statement for the dependent columns during a
primary key change.
.. seealso::
:ref:`passive_updates` - description of a similar feature as
used with :func:`.relationship`
:paramref:`.mapper.passive_deletes` - supporting ON DELETE
CASCADE for joined-table inheritance mappers
:param polymorphic_load: Specifies "polymorphic loading" behavior
for a subclass in an inheritance hierarchy (joined and single
table inheritance only). Valid values are:
* "'inline'" - specifies this class should be part of the
"with_polymorphic" mappers, e.g. its columns will be included
in a SELECT query against the base.
* "'selectin'" - specifies that when instances of this class
are loaded, an additional SELECT will be emitted to retrieve
the columns specific to this subclass. The SELECT uses
IN to fetch multiple subclasses at once.
.. versionadded:: 1.2
.. seealso::
:ref:`with_polymorphic_mapper_config`
:ref:`polymorphic_selectin`
:param polymorphic_on: Specifies the column, attribute, or
SQL expression used to determine the target class for an
incoming row, when inheriting classes are present.
This value is commonly a :class:`.Column` object that's
present in the mapped :class:`.Table`::
class Employee(Base):
__tablename__ = 'employee'
id = Column(Integer, primary_key=True)
discriminator = Column(String(50))
__mapper_args__ = {
"polymorphic_on":discriminator,
"polymorphic_identity":"employee"
}
It may also be specified
as a SQL expression, as in this example where we
use the :func:`.case` construct to provide a conditional
approach::
class Employee(Base):
__tablename__ = 'employee'
id = Column(Integer, primary_key=True)
discriminator = Column(String(50))
__mapper_args__ = {
"polymorphic_on":case([
(discriminator == "EN", "engineer"),
(discriminator == "MA", "manager"),
], else_="employee"),
"polymorphic_identity":"employee"
}
It may also refer to any attribute
configured with :func:`.column_property`, or to the
string name of one::
class Employee(Base):
__tablename__ = 'employee'
id = Column(Integer, primary_key=True)
discriminator = Column(String(50))
employee_type = column_property(
case([
(discriminator == "EN", "engineer"),
(discriminator == "MA", "manager"),
], else_="employee")
)
__mapper_args__ = {
"polymorphic_on":employee_type,
"polymorphic_identity":"employee"
}
When setting ``polymorphic_on`` to reference an
attribute or expression that's not present in the
locally mapped :class:`.Table`, yet the value
of the discriminator should be persisted to the database,
the value of the
discriminator is not automatically set on new
instances; this must be handled by the user,
either through manual means or via event listeners.
A typical approach to establishing such a listener
looks like::
from sqlalchemy import event
from sqlalchemy.orm import object_mapper
@event.listens_for(Employee, "init", propagate=True)
def set_identity(instance, *arg, **kw):
mapper = object_mapper(instance)
instance.discriminator = mapper.polymorphic_identity
Where above, we assign the value of ``polymorphic_identity``
for the mapped class to the ``discriminator`` attribute,
thus persisting the value to the ``discriminator`` column
in the database.
.. warning::
Currently, **only one discriminator column may be set**, typically
on the base-most class in the hierarchy. "Cascading" polymorphic
columns are not yet supported.
.. seealso::
:ref:`inheritance_toplevel`
:param polymorphic_identity: Specifies the value which
identifies this particular class as returned by the
column expression referred to by the ``polymorphic_on``
setting. As rows are received, the value corresponding
to the ``polymorphic_on`` column expression is compared
to this value, indicating which subclass should
be used for the newly reconstructed object.
:param properties: A dictionary mapping the string names of object
attributes to :class:`.MapperProperty` instances, which define the
persistence behavior of that attribute. Note that :class:`.Column`
objects present in
the mapped :class:`.Table` are automatically placed into
``ColumnProperty`` instances upon mapping, unless overridden.
When using Declarative, this argument is passed automatically,
based on all those :class:`.MapperProperty` instances declared
in the declared class body.
:param primary_key: A list of :class:`.Column` objects which define
the primary key to be used against this mapper's selectable unit.
This is normally simply the primary key of the ``local_table``, but
can be overridden here.
:param version_id_col: A :class:`.Column`
that will be used to keep a running version id of rows
in the table. This is used to detect concurrent updates or
the presence of stale data in a flush. The methodology is to
detect if an UPDATE statement does not match the last known
version id, a
:class:`~sqlalchemy.orm.exc.StaleDataError` exception is
thrown.
By default, the column must be of :class:`.Integer` type,
unless ``version_id_generator`` specifies an alternative version
generator.
.. seealso::
:ref:`mapper_version_counter` - discussion of version counting
and rationale.
:param version_id_generator: Define how new version ids should
be generated. Defaults to ``None``, which indicates that
a simple integer counting scheme be employed. To provide a custom
versioning scheme, provide a callable function of the form::
def generate_version(version):
return next_version
Alternatively, server-side versioning functions such as triggers,
or programmatic versioning schemes outside of the version id
generator may be used, by specifying the value ``False``.
Please see :ref:`server_side_version_counter` for a discussion
of important points when using this option.
.. versionadded:: 0.9.0 ``version_id_generator`` supports
server-side version number generation.
.. seealso::
:ref:`custom_version_counter`
:ref:`server_side_version_counter`
:param with_polymorphic: A tuple in the form ``(<classes>,
<selectable>)`` indicating the default style of "polymorphic"
loading, that is, which tables are queried at once. <classes> is
any single or list of mappers and/or classes indicating the
inherited classes that should be loaded at once. The special value
``'*'`` may be used to indicate all descending classes should be
loaded immediately. The second tuple argument <selectable>
indicates a selectable that will be used to query for multiple
classes.
.. seealso::
:ref:`with_polymorphic` - discussion of polymorphic querying
techniques.
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st Class %s has no primary mapper configured. Configure a primary mapper first before setting up a non primary Mapper.Ns� Class '%s' already has a primary mapper defined. Use non_primary=True to create a non primary Mapper. clear_mappers() will remove *all* current mappers from all classes.t
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c C@ sV | j rN | j rN | j d k rN | j j i | d 6� j d � | j D� � Sd Sd S( Nt parentmapperc s@ s | ] } | j Vq d S( N( RR ( R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>O s ( R2 R3 R= R' t _annotatet in_R� ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _single_table_criterionK s !c C@ s0 t j r t � n | j s g S| j | j � S( N( R Re R� Rl RO ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _with_polymorphic_mappersT s
c C@ sO | j s | j S| j \ } } | d k r/ | S| j | j | | � t � Sd S( N( Rl Rp R' RS RO R+ ( Ri RL RM ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _with_polymorphic_selectable\ s c C@ s t d � | j j � D� � S( Nc s@ s1 | ]' \ } } | t d � | D� � f Vq d S( c s@ s! | ] } | j j r | Vq d S( N( R& t should_evaluate_none( R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>u s N( R ( R� R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>r s ( R� R� R� ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _insert_cols_evaluating_noneo s c C@ s t d � | j j � D� � S( Nc s@ s1 | ]' \ } } | t d � | D� � f Vq d S( c s@ sC | ]9 } | j r | j r | j r | j j r | j Vq d S( N( Rj t server_defaultt defaultR& RZ R� ( R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>� s
N( R ( R� R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>~ s ( R� R� R� ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _insert_cols_as_none{ s c @ s# t � f d � � j j � D� � S( Nc 3@ s7 | ]- \ } } | t � f d � | D� � f Vq d S( c 3@ s% | ] } � j | j | f Vq d S( N( R� R� ( R� R� ( Ri ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>� s N( R� ( R� R� R� ( Ri ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>� s ( R� R� R� ( Ri ( ( Ri sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _propkey_to_col� s c C@ s t d � | j j � D� � S( Nc s@ s= | ]3 \ } } | t g | D] } | j ^ q � f Vq d S( N( R R� ( R� R� t pksR� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>� s ( R� R� R� ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _pk_keys_by_table� s c @ s# t � f d � � j j � D� � S( Nc 3@ sD | ]: \ } } | t g | D] } � j | j ^ q � f Vq d S( N( R R� R� ( R� R� R` R� ( Ri ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>� s ( R� R� R� ( Ri ( ( Ri sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _pk_attr_keys_by_table� s c C@ s t d � | j j � D� � S( Nc s@ sL | ]B \ } } | t g | D] } | j d k r | j ^ q � f Vq d S( N( R R\ R' R� ( R� R� R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>� s
( R� R� R� ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _server_default_cols� s
c C@ s� t � } xu | j j � D]d \ } } xU | D]M } | j d k sP | j d k r, | | j k r, | j | j | j � q, q, Wq W| S( N( R� R� R� R\ R' t server_onupdateR� R� R� ( Ri t resultR� R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt& _server_default_plus_onupdate_propkeys� s
"c C@ s t d � | j j � D� � S( Nc s@ sL | ]B \ } } | t g | D] } | j d k r | j ^ q � f Vq d S( N( R Rd R' R� ( R� R� R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>� s
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c C@ s | j S( s$ The :func:`.select` construct this :class:`.Mapper` selects from
by default.
Normally, this is equivalent to :attr:`.persist_selectable`, unless
the ``with_polymorphic`` feature is in use, in which case the
full "polymorphic" selectable is returned.
( RY ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyRM � s
c C@ s� | j r> | s | j d } n | t k rS | j d } qS n | t k rS d } n | j | | � } | d k r{ | | f S| | j | | � f Sd S( Ni i ( Rl R+ R' RO RS ( Ri RL RM RQ RN ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _with_polymorphic_args� s
c C@ s t | j | j � � S( N( R� t _iterate_polymorphic_propertiesRX ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _polymorphic_properties� s c c@ s� | d k r | j } n | s: x� | j D] } | Vq( Wn� x� t j t g | g | D] } t | j � ^ qT � � D]H } t | d t � r� | j d k ss | j
d | j k r� qs n | Vqs Wd S( sU Return an iterator of MapperProperty objects which will render into
a SELECT.R i N( R' RX RI R t unique_listR R� R R+ R= R� ( Ri RN R� Rn ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyRi � s 0c C@ s# t j r t � n t j | j � S( s] A namespace of all :class:`.MapperProperty` objects
associated this mapper.
This is an object that provides each property based on
its key name. For instance, the mapper for a
``User`` class which has ``User.name`` attribute would
provide ``mapper.attrs.name``, which would be the
:class:`.ColumnProperty` representing the ``name``
column. The namespace object can also be iterated,
which would yield each :class:`.MapperProperty`.
:class:`.Mapper` has several pre-filtered views
of this attribute which limit the types of properties
returned, including :attr:`.synonyms`, :attr:`.column_attrs`,
:attr:`.relationships`, and :attr:`.composites`.
.. warning::
The :attr:`.Mapper.attrs` accessor namespace is an
instance of :class:`.OrderedProperties`. This is
a dictionary-like object which includes a small number of
named methods such as :meth:`.OrderedProperties.items`
and :meth:`.OrderedProperties.values`. When
accessing attributes dynamically, favor using the dict-access
scheme, e.g. ``mapper.attrs[somename]`` over
``getattr(mapper.attrs, somename)`` to avoid name collisions.
.. seealso::
:attr:`.Mapper.all_orm_descriptors`
( R Re R� R t ImmutablePropertiesR� ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt attrs s "
c C@ s t j t | j j � � � S( s+ A namespace of all :class:`.InspectionAttr` attributes associated
with the mapped class.
These attributes are in all cases Python :term:`descriptors`
associated with the mapped class or its superclasses.
This namespace includes attributes that are mapped to the class
as well as attributes declared by extension modules.
It includes any Python descriptor type that inherits from
:class:`.InspectionAttr`. This includes
:class:`.QueryableAttribute`, as well as extension types such as
:class:`.hybrid_property`, :class:`.hybrid_method` and
:class:`.AssociationProxy`.
To distinguish between mapped attributes and extension attributes,
the attribute :attr:`.InspectionAttr.extension_type` will refer
to a constant that distinguishes between different extension types.
When dealing with a :class:`.QueryableAttribute`, the
:attr:`.QueryableAttribute.property` attribute refers to the
:class:`.MapperProperty` property, which is what you get when
referring to the collection of mapped properties via
:attr:`.Mapper.attrs`.
.. warning::
The :attr:`.Mapper.all_orm_descriptors` accessor namespace is an
instance of :class:`.OrderedProperties`. This is
a dictionary-like object which includes a small number of
named methods such as :meth:`.OrderedProperties.items`
and :meth:`.OrderedProperties.values`. When
accessing attributes dynamically, favor using the dict-access
scheme, e.g. ``mapper.all_orm_descriptors[somename]`` over
``getattr(mapper.all_orm_descriptors, somename)`` to avoid name
collisions.
.. seealso::
:attr:`.Mapper.attrs`
( R Rl R� R( t _all_sqla_attributes( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt all_orm_descriptors= s +c C@ s | j t j � S( s� Return a namespace of all :class:`.SynonymProperty`
properties maintained by this :class:`.Mapper`.
.. seealso::
:attr:`.Mapper.attrs` - namespace of all :class:`.MapperProperty`
objects.
( t _filter_propertiesR t SynonymProperty( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt synonymsl s c C@ s | j t j � S( s� Return a namespace of all :class:`.ColumnProperty`
properties maintained by this :class:`.Mapper`.
.. seealso::
:attr:`.Mapper.attrs` - namespace of all :class:`.MapperProperty`
objects.
( Rp R R� ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt column_attrsy s c C@ s | j t j � S( s4 A namespace of all :class:`.RelationshipProperty` properties
maintained by this :class:`.Mapper`.
.. warning::
the :attr:`.Mapper.relationships` accessor namespace is an
instance of :class:`.OrderedProperties`. This is
a dictionary-like object which includes a small number of
named methods such as :meth:`.OrderedProperties.items`
and :meth:`.OrderedProperties.values`. When
accessing attributes dynamically, favor using the dict-access
scheme, e.g. ``mapper.relationships[somename]`` over
``getattr(mapper.relationships, somename)`` to avoid name
collisions.
.. seealso::
:attr:`.Mapper.attrs` - namespace of all :class:`.MapperProperty`
objects.
( Rp R t RelationshipProperty( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt
relationships� s c C@ s | j t j � S( s� Return a namespace of all :class:`.CompositeProperty`
properties maintained by this :class:`.Mapper`.
.. seealso::
:attr:`.Mapper.attrs` - namespace of all :class:`.MapperProperty`
objects.
( Rp R t CompositeProperty( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt
composites� s c @ sB t j r t � n t j t j � f d � | j j � D� � � S( Nc 3@ s0 | ]& \ } } t | � � r | | f Vq d S( N( R- ( R� R� t v( t type_( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>� s ( R Re R� R Rl R� R� R� ( Ri Ry ( ( Ry sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyRp � s
c C@ so g | j D]$ } | t j d d | j �f ^ q
} t j g | D] \ } } | | k ^ qA � t j | � f S( s� create a "get clause" based on the primary key. this is used
by query.get() and many-to-one lazyloads to load this item
by primary key.
Ry N( Rj R t bindparamR' R& t and_R t column_dict( Ri Rj t paramsR� Rx ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _get_clause� s 1+c @ se t j � � � f d � } xC | j j D]5 } | j d k r( t j | j i i | d 6� q( q( W� S( s� Create a map of all equivalent columns, based on
the determination of column pairs that are equated to
one another based on inherit condition. This is designed
to work with the queries that util.polymorphic_union
comes up with, which often don't include the columns from
the base table directly (including the subclass table columns
only).
The resulting structure is a dictionary of columns mapped
to lists of equivalent columns, e.g.::
{
tablea.col1:
{tableb.col1, tablec.col1},
tablea.col2:
{tabled.col2}
}
c @ s� | j t j k r� | j � k r; � | j j | j � n t j | j f � � | j <| j � k r� � | j j | j � q� t j | j f � � | j <n d S( N( t operatorR t eqt leftR� t rightR R� ( t binary( Re ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt visit_binary� s R� N( R R| R� R� R5 R' R t traverse( Ri R� Rn ( ( Re sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _equivalent_columns� s c C@ s* t | t t j t j f � r" t St Sd S( N( R- R R t ClassManagerR t
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k r| j d | � t St S( s� determine whether a particular property should be implicitly
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s c C@ sH | j � } | j d k s! | r4 t | � j | � St | � | k Sd S( N( t primary_mapperR= R' R RK ( Ri R� t allow_subtypest s( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _canload*
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c c@ s% | } x | r | V| j } q Wd S( N( R3 ( Ri R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyR~ 9
s c C@ sX g } t | g � } x3 | rJ | j � } | j | � | j | j � q Wt j | � S( s� The collection including this mapper and all descendant mappers.
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all their inheriting mappers as well.
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t | j � S( sC Iterate through the collection including this mapper and
all descendant mappers.
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all their inheriting mappers as well.
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``mapper.base_mapper.polymorphic_iterator()``.
( RH R� ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt polymorphic_iteratorO
s c C@ s
| j j S( sS Return the primary mapper corresponding to this mapper's class key
(class).( R( Rn ( Ri ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyR� \
s c C@ s
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s c C@ s^ | j } | r2 g | D] } | j | ^ q } n x% | D] } | j | � s9 t Sq9 Wt Sd S( N( Rj R� t _has_keyR+ Rd ( Ri Re t adapterR� R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _result_has_identity_keyf
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c @ sX | j } | r2 g | D] } | j | ^ q } n | j t � f d � | D� � | f S( s� Return an identity-map key for use in storing/retrieving an
item from the identity map.
:param row: A :class:`.RowProxy` instance. The columns which are
mapped by this :class:`.Mapper` should be locatable in the row,
preferably via the :class:`.Column` object directly (as is the case
when a :func:`.select` construct is executed), or via string names of
the form ``<tablename>_<colname>``.
c 3@ s | ] } � | Vq d S( N( ( R� R� ( t row( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <genexpr>�
s ( Rj R� R� R� ( Ri R� t identity_tokenR� R� R� ( ( R� sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt identity_key_from_rowp
s #c C@ s | j t | � | f S( s� Return an identity-map key for use in storing/retrieving an
item from an identity map.
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( R� R� ( Ri Rj R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt identity_key_from_primary_key�
s c C@ s" t j | � } | j | t j � S( s� Return the identity key for the given instance, based on
its primary key attributes.
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will result in a database check to see if the object has been deleted.
If the row no longer exists,
:class:`~sqlalchemy.orm.exc.ObjectDeletedError` is raised.
This value is typically also found on the instance state under the
attribute name `key`.
( R t instance_statet _identity_key_from_statet PASSIVE_OFF( Ri t instanceR� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt identity_key_from_instance�
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c C@ sZ | j } | j } | j t g | j D]% } | | j j j | | | � ^ q% � | j f S( N( R� R� R� R� R� R� t implR� R� ( Ri R� t passiveR� R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyR� �
s 2c C@ s, t j | � } | j | t j � } | d S( sG Return the list of primary key values for the given
instance.
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If the row no longer exists,
:class:`~sqlalchemy.orm.exc.ObjectDeletedError` is raised.
i ( R R� R� R� ( Ri R� R� t identity_key( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt primary_key_from_instance�
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s c C@ s5 t | j � } | j d k r1 | j | j � n | S( N( R� Rj R= R' R� ( Ri t cols( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt _should_undefer_in_wildcard�
s c C@ s d � | j D� S( Nc S@ s h | ] } | j � q S( ( R� ( R� R� ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pys <setcomp>�
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d t �S( sl assemble a WHERE clause which retrieves a given state by primary
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for all relationships that meet the given cascade rule.
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The name of the cascade rule (i.e. ``"save-update"``, ``"delete"``,
etc.).
.. note:: the ``"all"`` cascade is not accepted here. For a generic
object traversal function, see :ref:`faq_walk_objects`.
:param state:
The lead InstanceState. child items will be processed per
the relationships defined for this object's mapper.
:return: the method yields individual object instances.
.. seealso::
:ref:`unitofwork_cascades`
:ref:`faq_walk_objects` - illustrates a generic function to
traverse all objects without relying on cascades.
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r{t j � d } t | d � su| | _ n � qXqc qc W| s�t t _ n Wd t a XWd t j � Xt j j t � j � d S( s� Initialize the inter-mapper relationships of all mappers that
have been constructed thus far.
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as well as whenever mappings are used and additional not-yet-configured
mappers have been constructed.
Points at which this occur include when a mapped class is instantiated
into an instance, as well as when the :meth:`.Session.query` method
is used.
The :func:`.configure_mappers` function provides several event hooks
that can be used to augment its functionality. These methods include:
* :meth:`.MapperEvents.before_configured` - called once before
:func:`.configure_mappers` does any work; this can be used to establish
additional options, properties, or related mappings before the operation
proceeds.
* :meth:`.MapperEvents.mapper_configured` - called as each individual
:class:`.Mapper` is configured within the process; will include all
mapper state except for backrefs set up by other mappers that are still
to be configured.
* :meth:`.MapperEvents.after_configured` - called once after
:func:`.configure_mappers` is complete; at this stage, all
:class:`.Mapper` objects that are known to SQLAlchemy will be fully
configured. Note that the calling application may still have other
mappings that haven't been produced yet, such as if they are in modules
as yet unimported.
NR� s� One or more mappers failed to initialize - can't proceed with initialization of other mappers. Triggering mapper: '%s'. Original exception was: %si ( R Re RX RY t _already_compilingRd R+ RZ t
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c C@ s
t | _ | S( s- Decorate a method as the 'reconstructor' hook.
Designates a method as the "reconstructor", an ``__init__``-like
method that will be called by the ORM after the instance has been
loaded from the database or otherwise reconstituted.
The reconstructor will be invoked with no arguments. Scalar
(non-collection) database-mapped attributes of the instance will
be available for use within the function. Eagerly-loaded
collections are generally not yet available and will usually only
contain the first element. ORM state changes made to objects at
this stage will not be recorded for the next flush() operation, so
the activity within a reconstructor should be conservative.
.. seealso::
:ref:`mapping_constructors`
:meth:`.InstanceEvents.load`
( Rd R� ( R& ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/mapper.pyt
reconstructor� s c @ s= | j d t � � | j d t � � � � � f d � } | S( s� Decorate a method as a 'validator' for one or more named properties.
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name of the attribute as well as a value to be assigned, or in the
case of a collection, the value to be added to the collection.
The function can then raise validation exceptions to halt the
process from continuing (where Python's built-in ``ValueError``
and ``AssertionError`` exceptions are reasonable choices), or can
modify or replace the value before proceeding. The function should
otherwise return the given value.
Note that a validator for a collection **cannot** issue a load of that
collection within the validation routine - this usage raises
an assertion to avoid recursion overflows. This is a reentrant
condition which is not supported.
:param \*names: list of attribute names to be validated.
:param include_removes: if True, "remove" events will be
sent as well - the validation function must accept an additional
argument "is_remove" which will be a boolean.
:param include_backrefs: defaults to ``True``; if ``False``, the
validation function will not emit if the originator is an attribute
event related via a backref. This can be used for bi-directional
:func:`.validates` usage where only one validator should emit per
attribute operation.
.. versionadded:: 0.9.0
.. seealso::
:ref:`simple_validators` - usage examples for :func:`.validates`
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