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that ``discriminator_on_association.py`` makes use of single table
inheritance do the work with the "discriminator". Also
added a true "generic foreign key" example, which works similarly
to other popular frameworks in that it uses an open-ended integer
to point to any other table, foregoing traditional referential
integrity. While we don't recommend this pattern, information wants
to be free. Also in 0.8.3.
- Added a convenience class decorator :func:`.as_declarative`, is
a wrapper for :func:`.declarative_base` which allows an existing base
class to be applied using a nifty class-decorated approach. Also
in 0.8.3.
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branch, [ticket:2717]
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where since it considers the current class' ``__table__``, was
sensitive to when it was called. This is 0.7's behavior also,
but in 0.7 things tended to "work out" within events like
``__mapper_args__()``. :func:`.has_inherited_table` now only
considers superclasses, so should return the same answer
regarding the current class no matter when it's called
(obviously assuming the state of the superclass).
[ticket:2656]
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attributes that are not Column or MapperProperty;
including any user-defined value as well
as association proxy objects. [ticket:2517]
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single-inheritance declarative subclasses,
with or without using a mixin, can be resolved
using a new @declared_attr usage described
in the documentation. [ticket:2472]
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the vast majority of file lines are spent on documentation, which moves
into package __init__. The core declarative idea lives in base and
is back down to its originally low size of under 500 lines. The various
helpers and such move into api.py, and the full span of string lookup
moves into a new module clsregistry. the rest of declarative only
refers to two functions in clsregistry in three places inside of base.
- [feature] Declarative now maintains a registry
of classes by string name as well as by full
module-qualified name. Multiple classes with the
same name can now be looked up based on a module-qualified
string within relationship(). Simple class name
lookups where more than one class shares the same
name now raises an informative error message.
[ticket:2338]
- lots of tests to ensure the new weak referencing memory management
is maintained by the new class registry system. this ticket was
served very well by waiting to do #2526 first, else this would
have needed to be rewritten anyway.
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