[Jc @ s d Z d d k l Z d d k i Z d d k l Z l Z d d k l
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d' Z e i d Z e i d Z e i d Z e i d Z e i d Z d e f d YZ d e f d YZ d e f d YZ d e
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e f d& YZ% d S(( s
Semi-private module containing various base classes used throughout the ORM.
Defines the extension classes :class:`MapperExtension`,
:class:`SessionExtension`, and :class:`AttributeExtension` as
well as other user-subclassable extension objects.
i( t chainN( t logt util( t
expressiont AttributeExtensiont EXT_CONTINUEt EXT_STOPt ExtensionOptiont InstrumentationManagert LoaderStrategyt MapperExtensiont MapperOptiont MapperPropertyt PropComparatort PropertyOptiont SessionExtensiont StrategizedOptiont StrategizedPropertyt
build_patht ONETOMANYt MANYTOONEt
MANYTOMANYc B s e Z d Z d Z d Z d Z d Z d Z d Z d Z d Z
d Z d
Z d Z
d Z d
Z d Z RS( st Base implementation for customizing Mapper behavior.
For each method in MapperExtension, returning a result of EXT_CONTINUE
will allow processing to continue to the next MapperExtension in line or
use the default functionality if there are no other extensions.
Returning EXT_STOP will halt processing of further extensions handling
that method. Some methods such as ``load`` have other return
requirements, see the individual documentation for details. Other than
these exception cases, any return value other than EXT_CONTINUE or
EXT_STOP will be interpreted as equivalent to EXT_STOP.
c C s t S( N( R ( t selft mappert class_( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt instrument_classA s c C s t S( N( R ( R R R t oldinitt instancet argst kwargs( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
init_instanceD s c C s t S( N( R ( R R R R R R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt init_failedG s c C s t S( s Perform pre-processing on the given result row and return a
new row instance.
This is called when the mapper first receives a row, before
the object identity or the instance itself has been derived
from that row.
( R ( R R t contextt row( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
translate_rowJ s c C s t S( s? Receive a row when a new object instance is about to be
created from that row.
The method can choose to create the instance itself, or it can return
EXT_CONTINUE to indicate normal object creation should take place.
mapper
The mapper doing the operation
selectcontext
SelectionContext corresponding to the instances() call
row
The result row from the database
class\_
The class we are mapping.
return value
A new object instance, or EXT_CONTINUE
( R ( R R t
selectcontextR! R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt create_instanceU s c K s t S( s Receive an object instance before that instance is appended
to a result list.
If this method returns EXT_CONTINUE, result appending will proceed
normally. if this method returns any other value or None,
result appending will not proceed for this instance, giving
this extension an opportunity to do the appending itself, if
desired.
mapper
The mapper doing the operation.
selectcontext
SelectionContext corresponding to the instances() call.
row
The result row from the database.
instance
The object instance to be appended to the result.
result
List to which results are being appended.
\**flags
extra information about the row, same as criterion in
``create_row_processor()`` method of :class:`~sqlalchemy.orm.interfaces.MapperProperty`
( R ( R R R# R! R t resultt flags( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
append_resultn s c K s t S( s Receive an instance before that instance has
its attributes populated.
This usually corresponds to a newly loaded instance but may
also correspond to an already-loaded instance which has
unloaded attributes to be populated. The method may be called
many times for a single instance, as multiple result rows are
used to populate eagerly loaded collections.
If this method returns EXT_CONTINUE, instance population will
proceed normally. If any other value or None is returned,
instance population will not proceed, giving this extension an
opportunity to populate the instance itself, if desired.
As of 0.5, most usages of this hook are obsolete. For a
generic "object has been newly created from a row" hook, use
``reconstruct_instance()``, or the ``@orm.reconstructor``
decorator.
( R ( R R R# R! R R& ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt populate_instance s c C s t S( s4 Receive an object instance after it has been created via
``__new__``, and after initial attribute population has
occurred.
This typically occurs when the instance is created based on
incoming result rows, and is only called once for that
instance's lifetime.
Note that during a result-row load, this method is called upon
the first row received for this instance. If eager loaders are
set to further populate collections on the instance, those
will *not* yet be completely loaded.
( R ( R R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt reconstruct_instance s c C s t S( s/ Receive an object instance before that instance is INSERTed
into its table.
This is a good place to set up primary key values and such
that aren't handled otherwise.
Column-based attributes can be modified within this method
which will result in the new value being inserted. However
*no* changes to the overall flush plan can be made; this means
any collection modification or save() operations which occur
within this method will not take effect until the next flush
call.
( R ( R R t
connectionR ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
before_insert s c C s t S( s; Receive an object instance after that instance is INSERTed.( R ( R R R* R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_insert s c C s t S( s Receive an object instance before that instance is UPDATEed.
Note that this method is called for all instances that are marked as
"dirty", even those which have no net changes to their column-based
attributes. An object is marked as dirty when any of its column-based
attributes have a "set attribute" operation called or when any of its
collections are modified. If, at update time, no column-based attributes
have any net changes, no UPDATE statement will be issued. This means
that an instance being sent to before_update is *not* a guarantee that
an UPDATE statement will be issued (although you can affect the outcome
here).
To detect if the column-based attributes on the object have net changes,
and will therefore generate an UPDATE statement, use
``object_session(instance).is_modified(instance, include_collections=False)``.
Column-based attributes can be modified within this method which will
result in their being updated. However *no* changes to the overall
flush plan can be made; this means any collection modification or
save() operations which occur within this method will not take effect
until the next flush call.
( R ( R R R* R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
before_update s c C s t S( s; Receive an object instance after that instance is UPDATEed.( R ( R R R* R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_update s c C s t S( s? Receive an object instance before that instance is DELETEed.
Note that *no* changes to the overall
flush plan can be made here; this means any collection modification,
save() or delete() operations which occur within this method will
not take effect until the next flush call.
( R ( R R R* R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
before_delete s
c C s t S( s; Receive an object instance after that instance is DELETEed.( R ( R R R* R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_delete s ( t __name__t
__module__t __doc__R R R R" R$ R' R( R) R+ R, R- R. R/ R0 ( ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR
3 s
c B sh e Z d Z d Z d Z d Z d Z d Z d Z d Z d Z
d Z d
Z RS( s An extension hook object for Sessions. Subclasses may be installed into a Session
(or sessionmaker) using the ``extension`` keyword argument.
c C s d S( s Execute right before commit is called.
Note that this may not be per-flush if a longer running transaction is ongoing.N( ( R t session( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
before_commit s c C s d S( s| Execute after a commit has occured.
Note that this may not be per-flush if a longer running transaction is ongoing.N( ( R R4 ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_commit s c C s d S( s~ Execute after a rollback has occured.
Note that this may not be per-flush if a longer running transaction is ongoing.N( ( R R4 ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_rollback
s c C s d S( s Execute before flush process has started.
`instances` is an optional list of objects which were passed to the ``flush()``
method.
N( ( R R4 t
flush_contextt instances( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt before_flush s c C s d S( s Execute after flush has completed, but before commit has been called.
Note that the session's state is still in pre-flush, i.e. 'new', 'dirty',
and 'deleted' lists still show pre-flush state as well as the history
settings on instance attributes.N( ( R R4 R8 ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_flush s c C s d S( sZ Execute after flush has completed, and after the post-exec state occurs.
This will be when the 'new', 'dirty', and 'deleted' lists are in their final
state. An actual commit() may or may not have occured, depending on whether or not
the flush started its own transaction or participated in a larger transaction.
N( ( R R4 R8 ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_flush_postexec s c C s d S( s Execute after a transaction is begun on a connection
`transaction` is the SessionTransaction. This method is called after an
engine level transaction is begun on a connection.
N( ( R R4 t transactionR* ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_begin( s c C s d S( ss Execute after an instance is attached to a session.
This is called after an add, delete or merge.
N( ( R R4 R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_attach/ s c C s d S( sG Execute after a bulk update operation to the session.
This is called after a session.query(...).update()
`query` is the query object that this update operation was called on.
`query_context` was the query context object.
`result` is the result object returned from the bulk operation.
N( ( R R4 t queryt
query_contextR% ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_bulk_update5 s c C s d S( sG Execute after a bulk delete operation to the session.
This is called after a session.query(...).delete()
`query` is the query object that this delete operation was called on.
`query_context` was the query context object.
`result` is the result object returned from the bulk operation.
N( ( R R4 R@ RA R% ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt after_bulk_delete? s (
R1 R2 R3 R5 R6 R7 R: R; R< R> R? RB RC ( ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR s
c B s e Z d Z d Z d Z d d d Z d Z d Z e Z
e Z d Z d Z
d Z d Z d
Z d Z d Z d
Z RS( s Manage the relationship of a ``Mapper`` to a single class
attribute, as well as that attribute as it appears on individual
instances of the class, including attribute instrumentation,
attribute access, loading behavior, and dependency calculations.
c K s d S( s Called by Query for the purposes of constructing a SQL statement.
Each MapperProperty associated with the target mapper processes the
statement referenced by the query context, adding columns and/or
criterion as appropriate.
N( ( R R t entityt patht adapterR ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt setupP s c C s
t d S( sg Return a 2-tuple consiting of two row processing functions and an instance post-processing function.
Input arguments are the query.SelectionContext and the *first*
applicable row of a result set obtained within
query.Query.instances(), called only the first time a particular
mapper's populate_instance() method is invoked for the overall result.
The settings contained within the SelectionContext as well as the
columns present in the row (which will be the same columns present in
all rows) are used to determine the presence and behavior of the
returned callables. The callables will then be used to process all
rows and instances.
Callables are of the following form::
def new_execute(state, dict_, row, **flags):
# process incoming instance state and given row. the instance is
# "new" and was just created upon receipt of this row.
# flags is a dictionary containing at least the following
# attributes:
# isnew - indicates if the instance was newly created as a
# result of reading this row
# instancekey - identity key of the instance
def existing_execute(state, dict_, row, **flags):
# process incoming instance state and given row. the instance is
# "existing" and was created based on a previous row.
return (new_execute, existing_execute)
Either of the three tuples can be ``None`` in which case no function
is called.
N( t NotImplementedError( R R# RE R R! RF ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt create_row_processorZ s #c C s
t d S( s Iterate through instances related to the given instance for
a particular 'cascade', starting with this MapperProperty.
See PropertyLoader for the related instance implementation.
( ( t iter( R t type_t statet visited_instancest halt_on( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt cascade_iterator s c C s
| | _ d S( N( t parent( R RP ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
set_parent s c C s
t d S( N( RH ( R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR s c C s t | _ | i t | _ d S( s Called after all mappers are created to assemble
relationships between mappers and perform other post-mapper-creation
initialization steps.
N( t Truet _compile_startedt do_initt _compile_finished( R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt init s
c C s d S( s Perform subclass-specific initialization post-mapper-creation steps.
This is a *template* method called by the
``MapperProperty`` object's init() method.
N( ( R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRT s c C s d S( sd Perform instrumentation adjustments that need to occur
after init() has completed.
N( ( R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt post_instrument_class s c O s d S( s Called by the ``Mapper`` in response to the UnitOfWork
calling the ``Mapper``'s register_dependencies operation.
Establishes a topological dependency between two mappers
which will affect the order in which mappers persist data.
N( ( R R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt register_dependencies s c O s d S( s Called by the ``Mapper`` in response to the UnitOfWork
calling the ``Mapper``'s register_processors operation.
Establishes a processor object between two mappers which
will link data and state between parent/child objects.
N( ( R R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt register_processors s c C s | i i S( s- Return True if this ``MapperProperty``'s mapper is the
primary mapper for its class.
This flag is used to indicate that the ``MapperProperty`` can
define attribute instrumentation for the class at the class
level (as opposed to the individual instance level).
( RP t non_primary( R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
is_primary s c C s
t d S( sd Merge the attribute represented by this ``MapperProperty``
from source to destination objectN( RH ( R R4 t sourcet destt dont_loadt
_recursive( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt merge s c C s | | i | S( s{ Return a compare operation for the columns represented by
this ``MapperProperty`` to the given value, which may be a
column value or an instance. 'operator' is an operator from
the operators module, or from sql.Comparator.
By default uses the PropComparator attached to this MapperProperty
under the attribute name "comparator".
( t
comparator( R t operatort value( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt compare s
N( R1 R2 R3 RG RI t NoneRO RQ R t FalseRS RU RV RT RW RX RY R[ R` Rd ( ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR I s
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c B sz e Z d Z d
d Z d Z d Z e d Z e d Z e d Z
d Z d
d Z d
d Z
RS( s defines comparison operations for MapperProperty objects.
PropComparator instances should also define an accessor 'property'
which returns the MapperProperty associated with this
PropComparator.
c C s& | | _ | _ | | _ | | _ d S( N( t propt propertyR RF ( R Rg R RF ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt __init__ s c C s t d | d S( Ns %r( RH ( R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt __clause_element__ s c C s | i | i | i | S( s Return a copy of this PropComparator which will use the given adaption function
on the local side of generated expressions.
( t __class__Rg R ( R RF ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt adapted s c K s | i | | S( N( t any( t at bR ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt any_op s c K s | i | | S( N( t has( Rn Ro R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt has_op s c C s
| i | S( N( t of_type( Rn R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
of_type_op s c C s | i t i | S( s Redefine this object in terms of a polymorphic subclass.
Returns a new PropComparator from which further criterion can be evaluated.
e.g.::
query.join(Company.employees.of_type(Engineer)).\
filter(Engineer.name=='foo')
\class_
a class or mapper indicating that criterion will be against
this specific subclass.
( t operateR
Rt ( R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRs s c K s | i t i | | S( s| Return true if this collection contains any member that meets the given criterion.
criterion
an optional ClauseElement formulated against the member class' table
or attributes.
\**kwargs
key/value pairs corresponding to member class attribute names which
will be compared via equality to the corresponding values.
( Ru R
Rp ( R t criterionR ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRm s c K s | i t i | | S( sz Return true if this element references a member which meets the given criterion.
criterion
an optional ClauseElement formulated against the member class' table
or attributes.
\**kwargs
key/value pairs corresponding to member class attribute names which
will be compared via equality to the corresponding values.
( Ru R
Rr ( R Rv R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRq s N( R1 R2 R3 Re Ri Rj Rl t staticmethodRp Rr Rt Rs Rm Rq ( ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR
s c B sM e Z d Z d Z d Z d Z d Z d Z d Z d Z RS( s" A MapperProperty which uses selectable strategies to affect
loading behavior.
There is a single default strategy selected by default. Alternate
strategies can be selected at Query time through the usage of
``StrategizedOption`` objects via the Query.options() method.
c C s` | i i d | f d } | o3 y | i | SWq\ t j
o | i | SXn | i Sd S( Nt loaderstrategy( t
attributest getRe t$ _StrategizedProperty__all_strategiest KeyErrort# _StrategizedProperty__init_strategyt strategy( R R RE t cls( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt __get_context_strategy8 s c C s3 y | i | SWn t j
o | i | SXd S( N( R{ R| R} ( R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
_get_strategyB s c C s% | | | i | <} | i | S( N( R{ RV ( R R R~ ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt __init_strategyH s
c K s3 | i | | | i f i | | | | | d S( N( t* _StrategizedProperty__get_context_strategyt keyt setup_query( R R RD RE RF R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRG M s c C s/ | i | | | i f i | | | | | S( N( R R RI ( R R RE R R! RF ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRI P s c C s" h | _ | i | i | _ d S( N( R{ R} t strategy_classR~ ( R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRT S s c C s% | i o | i i | n d S( N( R[ R~ t init_class_attribute( R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRW W s
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R1 R2 R3 R R R} RG RI RT RW ( ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR / s
c C s$ | o | | | f S| | f Sd S( N( ( RD R t prev( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR [ s c C s | d j o d Sg } g } t d t | d d D] } | | | | | d f q: ~ D] \ } } | | i | f q` ~ S( Ni i i ( Re t ranget lenR ( RE t _[1]t _[2]t iR R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt serialize_patha s
c C sp | d j o d St d j o d d k l a n t t g } | D] \ } } | t | | f qD ~ S( Ni( t class_mapper( Re R t sqlalchemy.ormt tupleR ( RE R R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt deserialize_pathj s
c B s e Z d Z d Z d Z RS( s# Describe a modification to a Query.c C s d S( N( ( R R@ ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt
process_queryy s c C s | i | d S( s same as process_query(), except that this option may not apply
to the given query.
Used when secondary loaders resend existing options to a new
Query.N( R ( R R@ ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyt process_query_conditionally| s ( R1 R2 R3 R R ( ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR v s c B s e Z d Z d Z d Z RS( sC a MapperOption that applies a MapperExtension to a query operation.c C s
| | _ d S( N( t ext( R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRi s c C s5 | i } | i i | _ | i i | i d S( N( t _generate_mapper_zerot extensiont copyt pushR ( R R@ RD ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR s ( R1 R2 R3 Ri R ( ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR s c B sb e Z d Z d
d Z d Z d Z d Z d Z d Z d Z
d Z d Z RS( s A MapperOption that is applied to a property off the mapper or
one of its child mappers, identified by a dot-separated key.
c C s | | _ | | _ d S( N( R R ( R R R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyRi s c C s | i | t d S( N( t _processRR ( R R@ ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR s c C s | i | t d S( N( R Rf ( R R@ ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR s c C s1 | i | | } | o | i | | n d S( N( t _PropertyOption__get_pathst process_query_property( R R@ t raiseerrt paths( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR s c C s d S( N( ( R R@ R ( ( s= /usr/lib/python2.6/site-packages/sqlalchemy/orm/interfaces.pyR s c
C s d d k l } l } | | o
| } n | | i } xu | i D] } | i | j o | SqF W| oD t i d | g } | i D] } | t | i q ~ f n d Sd S( Ni( t _class_to_mappert _is_aliased_classs0 Can't find entity %s in Query. Current list: %r( t sqlalchemy.orm.utilR R t base_mappert _mapper_entitiest path_entityt sa_exct
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