This is a bugfix release, available for download at :
http://www.sqlalchemy.org/download.html
0.5.6
=====
- orm
- Fixed bug whereby inheritance discriminator part of a
composite primary key would fail on updates.
Continuation of [ticket:1300].
- Fixed bug which disallowed one side of a many-to-many
bidirectional reference to declare itself as "viewonly"
[ticket:1507]
- Added an assertion that prevents a @validates function
or other AttributeExtension from loading an unloaded
collection such that internal state may be corrupted.
[ticket:1526]
- Fixed bug which prevented two entities from mutually
replacing each other's primary key values within a single
flush() for some orderings of operations. [ticket:1519]
- Fixed an obscure issue whereby a joined-table subclass
with a self-referential eager load on the base class
would populate the related object's "subclass" table with
data from the "subclass" table of the parent.
[ticket:1485]
- relations() now have greater ability to be "overridden",
meaning a subclass that explicitly specifies a relation()
overriding that of the parent class will be honored
during a flush. This is currently to support
many-to-many relations from concrete inheritance setups.
Outside of that use case, YMMV. [ticket:1477]
- Squeezed a few more unnecessary "lazy loads" out of
relation(). When a collection is mutated, many-to-one
backrefs on the other side will not fire off to load
the "old" value, unless "single_parent=True" is set.
A direct assignment of a many-to-one still loads
the "old" value in order to update backref collections
on that value, which may be present in the session
already, thus maintaining the 0.5 behavioral contract.
[ticket:1483]
- Fixed bug whereby a load/refresh of joined table
inheritance attributes which were based on
column_property() or similar would fail to evaluate.
[ticket:1480]
- Improved support for MapperProperty objects overriding
that of an inherited mapper for non-concrete
inheritance setups - attribute extensions won't randomly
collide with each other. [ticket:1488]
- UPDATE and DELETE do not support ORDER BY, LIMIT, OFFSET,
etc. in standard SQL. Query.update() and Query.delete()
now raise an exception if any of limit(), offset(),
order_by(), group_by(), or distinct() have been
called. [ticket:1487]
- Added AttributeExtension to sqlalchemy.orm.__all__
- Improved error message when query() is called with
a non-SQL /entity expression. [ticket:1476]
- Using False or 0 as a polymorphic discriminator now
works on the base class as well as a subclass.
[ticket:1440]
- Added enable_assertions(False) to Query which disables
the usual assertions for expected state - used
by Query subclasses to engineer custom state.
[ticket:1424]. See
http://www.sqlalchemy.org/trac/wiki/UsageRecipes/PreFilteredQuery
for an example.
- Fixed recursion issue which occured if a mapped object's
`__len__()` or `__nonzero__()` method resulted in state
changes. [ticket:1501]
- Fixed incorrect exception raise in
Weak/StrongIdentityMap.add()
[ticket:1506]
- Fixed the error message for "could not find a FROM clause"
in query.join() which would fail to issue correctly
if the query was against a pure SQL construct.
[ticket:1522]
- Fixed a somewhat hypothetical issue which would result
in the wrong primary key being calculated for a mapper
using the old polymorphic_union function - but this
is old stuff. [ticket:1486]
- sql
- Fixed column.copy() to copy defaults and onupdates.
[ticket:1373]
- Fixed a bug in extract() introduced in 0.5.4 whereby
the string "field" argument was getting treated as a
ClauseElement, causing various errors within more
complex SQL transformations.
- Unary expressions such as DISTINCT propagate their
type handling to result sets, allowing conversions like
unicode and such to take place. [ticket:1420]
- Fixed bug in Table and Column whereby passing empty
dict for "info" argument would raise an exception.
[ticket:1482]
- postgresql
- The driver can be specified as "postgresql://" in URLs,
allowing forwards-compatibility with 0.6.
- oracle
- Backported 0.6 fix for Oracle alias names not getting
truncated. [ticket:1309]
- ext
- The collection proxies produced by associationproxy are now
pickleable. A user-defined proxy_factory however
is still not pickleable unless it defines __getstate__
and __setstate__. [ticket:1446]
- Declarative will raise an informative exception if
__table_args__ is passed as a tuple with no dict argument.
Improved documentation. [ticket:1468]
- Table objects declared in the MetaData can now be used
in string expressions sent to primaryjoin/secondaryjoin/
secondary - the name is pulled from the MetaData of the
declarative base. [ticket:1527]
- A column can be added to a joined-table subclass after
the class has been constructed (i.e. via class-level
attribute assignment). The column is added to the underlying
Table as always, but now the mapper will rebuild its
"join" to include the new column, instead of raising
an error about "no such column, use column_property()
instead". [ticket:1523]
- test
- Added examples into the test suite so they get exercised
regularly and cleaned up a couple deprecation warnings.
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