Storm 0.19

0.19 (2011-10-03)
=================

Improvements
------------
 - A new Cast expressions compiles an input and the type to cast it to
   into a call the CAST function (bug #681121).
 - The storm.zope.testing.ZStormResourceManager now supports applying database
   schemas using a custom URI, typically for connecting to the database using a
   different user with greater privileges than the user running the tests. Note
   that the format of the 'databases' parameter passed to the constructor of
   the ZStormResourceManager class has changed. So now you have to create your
   resource manager roughly like this::

    databases = [{"name": "test",
                  "uri": "postgres://user@host/db",
                  "schema": Schema(...),
                  "schema-uri: "postgres://schema_user@host/db"}]
    manager = ZStormResourceManager(databases)

   where the "schema-uri" key is optional and would default to "uri" if
   not given. The old format of the 'databases' parameter is still supported
   but deprecated. (bug #772258)
 - A new storm.twisted.transact module has been added with facilities to
   integrate Storm with twisted, by running transactions in a separate
   thread from the main one in order to not block the reactor. (bug #777047)
 - ResultSet.config's "distinct" argument now also accepts a tuple of
   columns, which will be turned into a DISTINCT ON clause.
 - Provide wrapped cursor objects in the Django integration
   layer. Catch some disconnection errors that might otherwise be
   missed, leading to broken connections. (bug #816049)
 - A new JSON property is available. It's similar to the existing
   Pickle property, except that it serializes data as JSON, and must
   back onto a text column rather than a byte column. (bug #726799, #846867)
 - Cache the compilation of columns and tables (bug #826170, #848925).
 - Add two new tracers extracted from the Launchpad codebase.
   BaseStatementTracer provides statements with parameters substituted
   to its subclasses. TimelineTracer records queries in a timeline
   (useful for OOPS reports).
 - New ROW constructor (bug #698344).
 - Add support for Postgres DISTINCT ON queries. (bug #374777)

Bug fixes
---------
 - When retrieving and using an object with Store.get(), Storm will no
   longer issue two queries when there is a live invalidated object
   (bug #697513).
 - When a datetime object is returned by the database driver,
   DateVariable failed to detect and convert it to a date() object
   (bug #391601).
 - The ISQLObjectResultSet declares an is_empty method, which matches
   the existing implementation. This makes it possible to call the
   method in security proxied environments (bug #759384).
 - The UUIDVariable correctly converts inputs to unicode before
   sending them to the database. This makes the UUID property usable
   (bug #691752).
 - Move the firing of the register-transaction event in
   Connection.execute before the connection checking, to make sure
   that the store gets registered properly for future rollbacks (bug
   #819282).
 - Skip tests/zope/README.txt when zope.security is not found. (bug #848848)
 - Fix the handling of disconnection errors in the storm.django bridge. (bug
   #854787)