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� j | � S( s) Create a ``UNION`` statement used by a polymorphic mapper.
See :ref:`concrete_inheritance` for an example of how
this is used.
:param table_map: mapping of polymorphic identities to
:class:`.Table` objects.
:param typecolname: string name of a "discriminator" column, which will be
derived from the query, producing the polymorphic identity for
each row. If ``None``, no polymorphic discriminator is generated.
:param aliasname: name of the :func:`~sqlalchemy.sql.expression.alias()`
construct generated.
:param cast_nulls: if True, non-existent columns, which are represented
as labeled NULLs, will be passed into CAST. This is a legacy behavior
that is problematic on some backends such as Oracle - in which case it
can be set to False.
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| � } | j | � Sd S( s Generate "identity key" tuples, as are used as keys in the
:attr:`.Session.identity_map` dictionary.
This function has several call styles:
* ``identity_key(class, ident, identity_token=token)``
This form receives a mapped class and a primary key scalar or
tuple as an argument.
E.g.::
>>> identity_key(MyClass, (1, 2))
(<class '__main__.MyClass'>, (1, 2), None)
:param class: mapped class (must be a positional argument)
:param ident: primary key, may be a scalar or tuple argument.
:param identity_token: optional identity token
.. versionadded:: 1.2 added identity_token
* ``identity_key(instance=instance)``
This form will produce the identity key for a given instance. The
instance need not be persistent, only that its primary key attributes
are populated (else the key will contain ``None`` for those missing
values).
E.g.::
>>> instance = MyClass(1, 2)
>>> identity_key(instance=instance)
(<class '__main__.MyClass'>, (1, 2), None)
In this form, the given instance is ultimately run though
:meth:`.Mapper.identity_key_from_instance`, which will have the
effect of performing a database check for the corresponding row
if the object is expired.
:param instance: object instance (must be given as a keyword arg)
* ``identity_key(class, row=row, identity_token=token)``
This form is similar to the class/tuple form, except is passed a
database result row as a :class:`.RowProxy` object.
E.g.::
>>> row = engine.execute("select * from table where a=1 and b=2").first()
>>> identity_key(MyClass, row=row)
(<class '__main__.MyClass'>, (1, 2), None)
:param class: mapped class (must be a positional argument)
:param row: :class:`.RowProxy` row returned by a :class:`.ResultProxy`
(must be given as a keyword arg)
:param identity_token: optional identity token
.. versionadded:: 1.2 added identity_token
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B sM e Z d Z d d e e d d d e e d � Z d � Z d � Z d � Z RS( s� Represents an "aliased" form of a mapped class for usage with Query.
The ORM equivalent of a :func:`~sqlalchemy.sql.expression.alias`
construct, this object mimics the mapped class using a
``__getattr__`` scheme and maintains a reference to a
real :class:`~sqlalchemy.sql.expression.Alias` object.
A primary purpose of :class:`.AliasedClass` is to serve as an alternate
within a SQL statement generated by the ORM, such that an existing
mapped entity can be used in multiple contexts. A simple example::
# find all pairs of users with the same name
user_alias = aliased(User)
session.query(User, user_alias).\
join((user_alias, User.id > user_alias.id)).\
filter(User.name == user_alias.name)
:class:`.AliasedClass` is also capable of mapping an existing mapped
class to an entirely new selectable, provided this selectable is column-
compatible with the existing mapped selectable, and it can also be
configured in a mapping as the target of a :func:`.relationship`.
See the links below for examples.
The :class:`.AliasedClass` object is constructed typically using the
:func:`.orm.aliased` function. It also is produced with additional
configuration when using the :func:`.orm.with_polymorphic` function.
The resulting object is an instance of :class:`.AliasedClass`.
This object implements an attribute scheme which produces the
same attribute and method interface as the original mapped
class, allowing :class:`.AliasedClass` to be compatible
with any attribute technique which works on the original class,
including hybrid attributes (see :ref:`hybrids_toplevel`).
The :class:`.AliasedClass` can be inspected for its underlying
:class:`.Mapper`, aliased selectable, and other information
using :func:`.inspect`::
from sqlalchemy import inspect
my_alias = aliased(MyClass)
insp = inspect(my_alias)
The resulting inspection object is an instance of :class:`.AliasedInsp`.
.. seealso::
:func:`.aliased`
:func:`.with_polymorphic`
:ref:`relationship_aliased_class`
:ref:`relationship_to_window_function`
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s� Provide an inspection interface for an
:class:`.AliasedClass` object.
The :class:`.AliasedInsp` object is returned
given an :class:`.AliasedClass` using the
:func:`.inspect` function::
from sqlalchemy import inspect
from sqlalchemy.orm import aliased
my_alias = aliased(MyMappedClass)
insp = inspect(my_alias)
Attributes on :class:`.AliasedInsp`
include:
* ``entity`` - the :class:`.AliasedClass` represented.
* ``mapper`` - the :class:`.Mapper` mapping the underlying class.
* ``selectable`` - the :class:`.Alias` construct which ultimately
represents an aliased :class:`.Table` or :class:`.Select`
construct.
* ``name`` - the name of the alias. Also is used as the attribute
name when returned in a result tuple from :class:`.Query`.
* ``with_polymorphic_mappers`` - collection of :class:`.Mapper` objects
indicating all those mappers expressed in the select construct
for the :class:`.AliasedClass`.
* ``polymorphic_on`` - an alternate column or SQL expression which
will be used as the "discriminator" for a polymorphic load.
.. seealso::
:ref:`inspection_toplevel`
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C sc t | t j � r= | r* t j d � � n | j | d | �St | d | d | d | d | �Sd S( sg Produce an alias of the given element, usually an :class:`.AliasedClass`
instance.
E.g.::
my_alias = aliased(MyClass)
session.query(MyClass, my_alias).filter(MyClass.id > my_alias.id)
The :func:`.aliased` function is used to create an ad-hoc mapping
of a mapped class to a new selectable. By default, a selectable
is generated from the normally mapped selectable (typically a
:class:`.Table`) using the :meth:`.FromClause.alias` method.
However, :func:`.aliased` can also be used to link the class to
a new :func:`.select` statement. Also, the :func:`.with_polymorphic`
function is a variant of :func:`.aliased` that is intended to specify
a so-called "polymorphic selectable", that corresponds to the union
of several joined-inheritance subclasses at once.
For convenience, the :func:`.aliased` function also accepts plain
:class:`.FromClause` constructs, such as a :class:`.Table` or
:func:`.select` construct. In those cases, the :meth:`.FromClause.alias`
method is called on the object and the new :class:`.Alias` object
returned. The returned :class:`.Alias` is not ORM-mapped in this case.
:param element: element to be aliased. Is normally a mapped class,
but for convenience can also be a :class:`.FromClause` element.
:param alias: Optional selectable unit to map the element to. This should
normally be a :class:`.Alias` object corresponding to the :class:`.Table`
to which the class is mapped, or to a :func:`.select` construct that
is compatible with the mapping. By default, a simple anonymous
alias of the mapped table is generated.
:param name: optional string name to use for the alias, if not specified
by the ``alias`` parameter. The name, among other things, forms the
attribute name that will be accessible via tuples returned by a
:class:`.Query` object.
:param flat: Boolean, will be passed through to the
:meth:`.FromClause.alias` call so that aliases of :class:`.Join` objects
don't include an enclosing SELECT. This can lead to more efficient
queries in many circumstances. A JOIN against a nested JOIN will be
rewritten as a JOIN against an aliased SELECT subquery on backends that
don't support this syntax.
.. versionadded:: 0.9.0
.. seealso:: :meth:`.Join.alias`
:param adapt_on_names: if True, more liberal "matching" will be used when
mapping the mapped columns of the ORM entity to those of the
given selectable - a name-based match will be performed if the
given selectable doesn't otherwise have a column that corresponds
to one on the entity. The use case for this is when associating
an entity with some derived selectable such as one that uses
aggregate functions::
class UnitPrice(Base):
__tablename__ = 'unit_price'
...
unit_id = Column(Integer)
price = Column(Numeric)
aggregated_unit_price = Session.query(
func.sum(UnitPrice.price).label('price')
).group_by(UnitPrice.unit_id).subquery()
aggregated_unit_price = aliased(UnitPrice,
alias=aggregated_unit_price, adapt_on_names=True)
Above, functions on ``aggregated_unit_price`` which refer to
``.price`` will return the
``func.sum(UnitPrice.price).label('price')`` column, as it is
matched on the name "price". Ordinarily, the "price" function
wouldn't have any "column correspondence" to the actual
``UnitPrice.price`` column as it is not a proxy of the original.
s+ adapt_on_names only applies to ORM elementsR� Rm Rd R� N( R R t
FromClauseR& R' Rm R� ( t elementRm Rd R� R� ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt aliased� s P c
C s� t | � } | rh t j | � } t g | j D] }
|
j ^ q. � } | | k rV | S| j | � } n | j | | d | �\ } } | s� | r� | j d | � } n t | | d | d | d | d | �S( s� Produce an :class:`.AliasedClass` construct which specifies
columns for descendant mappers of the given base.
Using this method will ensure that each descendant mapper's
tables are included in the FROM clause, and will allow filter()
criterion to be used against those tables. The resulting
instances will also have those columns already loaded so that
no "post fetch" of those columns will be required.
.. seealso::
:ref:`with_polymorphic` - full discussion of
:func:`.orm.with_polymorphic`.
:param base: Base class to be aliased.
:param classes: a single class or mapper, or list of
class/mappers, which inherit from the base class.
Alternatively, it may also be the string ``'*'``, in which case
all descending mapped classes will be added to the FROM clause.
:param aliased: when True, the selectable will be wrapped in an
alias, that is ``(SELECT * FROM <fromclauses>) AS anon_1``.
This can be important when using the with_polymorphic()
to create the target of a JOIN on a backend that does not
support parenthesized joins, such as SQLite and older
versions of MySQL. However if the
:paramref:`.with_polymorphic.selectable` parameter is in use
with an existing :class:`.Alias` construct, then you should not
set this flag.
:param flat: Boolean, will be passed through to the
:meth:`.FromClause.alias` call so that aliases of :class:`.Join`
objects don't include an enclosing SELECT. This can lead to more
efficient queries in many circumstances. A JOIN against a nested JOIN
will be rewritten as a JOIN against an aliased SELECT subquery on
backends that don't support this syntax.
Setting ``flat`` to ``True`` implies the ``aliased`` flag is
also ``True``.
.. versionadded:: 0.9.0
.. seealso:: :meth:`.Join.alias`
:param selectable: a table or select() statement that will
be used in place of the generated FROM clause. This argument is
required if any of the desired classes use concrete table
inheritance, since SQLAlchemy currently cannot generate UNIONs
among tables automatically. If used, the ``selectable`` argument
must represent the full set of tables and columns mapped by every
mapped class. Otherwise, the unaccounted mapped columns will
result in their table being appended directly to the FROM clause
which will usually lead to incorrect results.
:param polymorphic_on: a column to be used as the "discriminator"
column for the given selectable. If not given, the polymorphic_on
attribute of the base classes' mapper will be used, if any. This
is useful for mappings that don't have polymorphic loading
behavior by default.
:param innerjoin: if True, an INNER JOIN will be used. This should
only be specified if querying for one specific subtype only
t innerjoinR� R� R� R� R� (
R R t to_setR# R� R� t uniont _with_polymorphic_argsRm R� (
t baset classesR� R� R� R� R� R� t _existing_aliast primary_mapperR� t new_classest mappers( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt with_polymorphicC s& K " c C s t j | i t d 6| � S( s� Deep copy the given ClauseElement, annotating each element with the
"_orm_adapt" flag.
Elements within the exclude collection will be cloned but not annotated.
t
_orm_adapt( Rs t _deep_annotateRU ( R� t exclude( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt
_orm_annotate� s c C s t j | d d �S( s� Remove annotations that link a column to a particular mapping.
Note this doesn't affect "remote" and "foreign" annotations
passed by the :func:`.orm.foreign` and :func:`.orm.remote`
annotators.
R4 R� R� ( R� R� ( Rs t _deep_deannotate( R� ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt _orm_deannotate� s c C s
t j | � S( N( Rs R� ( R� ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt _orm_full_deannotate� s t _ORMJoinc B sb e Z d Z e j j Z d e e d d d � Z d � Z d e e d d � Z
d e d d � Z RS( s/ Extend Join to support ORM constructs as input.c C s5 t j | � } t | d | � } t j | � }
|
j } |
| _ | | _ | | _ t | t j � r{ t | j
| � } n t | t j � r� | j
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j � \ } } } } } } | d k r�| rnt j | | | � } | } q�t j | | | | � } | } n | } | | _ n t j j | | | | | | � |
r1t |
d d � r1|
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j j } | d k r1|
j r|
j! j" | � } n | j# | @| _# q1n d S( Nt _joined_from_infot source_selectablet dest_selectablet source_polymorphict dest_polymorphict of_type_mapperR� ($ R R� R� R� R� t
_left_memot _right_memoR R R R� R t QueryableAttributet
comparatort _source_selectableR� R
t parentR! Rs t clause_is_presentt
_create_joinsRU R� R R( t _target_adapterR t JoinR� t singlet _single_table_criterionR� R� R� R� ( R6 t leftt rightR� t isoutert fullR R t left_infot
left_orm_infot
right_infot adapt_tot
on_selectablet propt
adapt_fromt pjt sjt sourcet destt secondaryt target_adaptert single_crit( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyR� � sV
c
C s� | } x t | t j � r' | j } q Wt | j | j | j d | j d | j d | j �} t | | j | j d | j d | j �S( sl Splice a join into the center.
Given join(a, b) and join(b, c), return join(a, b).join(c)
R R R (
R R R R R� R� R R R
R ( R6 t othert leftmostR ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt _splice_into_center s
c C s t | | | d | d | �S( NR R ( R� ( R6 R
R� R R t join_to_left( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyR( 8 s c C s t | | | d t d | �S( NR R ( R� RU ( R6 R
R� R R! ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt outerjoinB s N( R> R? R@ R R t __visit_name__R! RM R� R R( R" ( ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyR� � s J c C s t | | | | | � S( s� Produce an inner join between left and right clauses.
:func:`.orm.join` is an extension to the core join interface
provided by :func:`.sql.expression.join()`, where the
left and right selectables may be not only core selectable
objects such as :class:`.Table`, but also mapped classes or
:class:`.AliasedClass` instances. The "on" clause can
be a SQL expression, or an attribute or string name
referencing a configured :func:`.relationship`.
:func:`.orm.join` is not commonly needed in modern usage,
as its functionality is encapsulated within that of the
:meth:`.Query.join` method, which features a
significant amount of automation beyond :func:`.orm.join`
by itself. Explicit usage of :func:`.orm.join`
with :class:`.Query` involves usage of the
:meth:`.Query.select_from` method, as in::
from sqlalchemy.orm import join
session.query(User).\
select_from(join(User, Address, User.addresses)).\
filter(Address.email_address=='foo@bar.com')
In modern SQLAlchemy the above join can be written more
succinctly as::
session.query(User).\
join(User.addresses).\
filter(Address.email_address=='foo@bar.com')
See :meth:`.Query.join` for information on modern usage
of ORM level joins.
.. deprecated:: 0.8
the ``join_to_left`` parameter is deprecated, and will be removed
in a future release. The parameter has no effect.
( R� ( R R
R� R R R! ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyR( F s *c C s t | | | t | � S( s Produce a left outer join between left and right clauses.
This is the "outer join" version of the :func:`.orm.join` function,
featuring the same behavior except that an OUTER JOIN is generated.
See that function's documentation for other usage details.
( R� RU ( R R
R� R R! ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyR" s s c C sg t | t j � r6 t | � } t | j | � j } n t | t j � rT | j } n | j | d | �S( s� Create filtering criterion that relates this query's primary entity
to the given related instance, using established :func:`.relationship()`
configuration.
The SQL rendered is the same as that rendered when a lazy loader
would fire off from the given parent on that attribute, meaning
that the appropriate state is taken from the parent object in
Python without the need to render joins to the parent table
in the rendered statement.
:param instance:
An instance which has some :func:`.relationship`.
:param property:
String property name, or class-bound attribute, which indicates
what relationship from the instance should be used to reconcile the
parent/child relationship.
:param from_entity:
Entity in which to consider as the left side. This defaults to the
"zero" entity of the :class:`.Query` itself.
.. versionadded:: 1.2
t from_entity(
R R R R R� R� R� R R t _with_parent( R� R R$ R� ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt with_parent~ s c C s t j | � } | j S( s� Return True if the given object has a database
identity.
This typically corresponds to the object being
in either the persistent or detached state.
.. seealso::
:func:`.was_deleted`
( R t instance_statet has_identity( t object_RF ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyR( � s c C s t j | � } | j S( s� Return True if the given object was deleted
within a session flush.
This is regardless of whether or not the object is
persistent or detached.
.. seealso::
:attr:`.InstanceState.was_deleted`
( R R' t was_deleted( R) RF ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyR* � s
c C sh | j r/ | j r+ | j | j k r+ t Sn t S| j r[ | j rN | | j k S| | k Sn | j | � S( s� determine if 'given' corresponds to 'entity', in terms
of an entity passed to Query that would match the same entity
being referred to elsewhere in the query.
( R� R� RU RM R� R� t
common_parent( t givenR� ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt _entity_corresponds_to� s
c C sh | j r5 | j o4 | j o4 | | k p4 | | j k S| j sN | j | j � S| j oc | | j k Sd S( s determine if 'given' corresponds to 'entity', in terms
of a path of loader options where a mapped attribute is taken to
be a member of a parent entity.
e.g.::
someoption(A).someoption(A.b) # -> fn(A, A) -> True
someoption(A).someoption(C.d) # -> fn(A, C) -> False
a1 = aliased(A)
someoption(a1).someoption(A.b) # -> fn(a1, A) -> False
someoption(a1).someoption(a1.b) # -> fn(a1, a1) -> True
wp = with_polymorphic(A, [A1, A2])
someoption(wp).someoption(A1.foo) # -> fn(wp, A1) -> False
someoption(wp).someoption(wp.A1.foo) # -> fn(wp, wp.A1) -> True
N( R� R� R� R+ R� R� ( R, R� ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt$ _entity_corresponds_to_use_path_impl� s
c C sO | j r( | | j k p' | j j | � S| j r> | | j k S| j | � Sd S( se determine if 'given' "is a" mapper, in terms of the given
would load rows of type 'mapper'.
N( R� R� R� R� ( R, R� ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt _entity_isa� s
c C sk d d l m } m } m } m } d d l m } d d l m } | | _ | _ | _ | _ | _ d S( sZ Use random-ordering sets within the unit of work in order
to detect unit of work sorting issues.
This is a utility function that can be used to help reproduce
inconsistent unit of work sorting issues. For example,
if two kinds of objects A and B are being inserted, and
B has a foreign key reference to A - the A must be inserted first.
However, if there is no relationship between A and B, the unit of work
won't know to perform this sorting, and an operation may or may not
fail, depending on how the ordering works out. Since Python sets
and dictionaries have non-deterministic ordering, such an issue may
occur on some runs and not on others, and in practice it tends to
have a great dependence on the state of the interpreter. This leads
to so-called "heisenbugs" where changing entirely irrelevant aspects
of the test program still cause the failure behavior to change.
By calling ``randomize_unitofwork()`` when a script first runs, the
ordering of a key series of sets within the unit of work implementation
are randomized, so that the script can be minimized down to the
fundamental mapping and operation that's failing, while still reproducing
the issue on at least some runs.
This utility is also available when running the test suite via the
``--reversetop`` flag.
i����( t
unitofworkt sessionR� t
dependency( t topological( t RandomSetN(
t sqlalchemy.ormR0 R1 R� R2 t sqlalchemy.utilR3 t sqlalchemy.testing.utilR4 R# ( R0 R1 R� R2 R3 R4 ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt randomize_unitofwork s "( R s
delete-orphanR R R s save-updates refresh-expireR (= R: Rh R9 R R� R R R R R R R R R R
R R t
interfacesR
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path_registryR R R R& R R R R Rs R/ RA R R] RU R} R� R� R� t objectR� R� t _inspectsR! RM R� R� R� R� R� R R� R( R" R& R( R* R- R. R/ R8 ( ( ( sF /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/orm/util.pyt <module> s~ ? CH g'��c \
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