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setups, where the attempt to check for "duplicate class name" in
declarative would hit upon a not-totally-cleaned-up weak reference
related to some other class being removed; the check here now ensures
the weakref still references an object before calling upon it further.
fixes #3208
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to get all flake8 passing
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target of :paramref:`.relationship.secondary` for the purposes
of creating very complex :func:`.relationship` join conditions.
The change includes adjustments to query joining, joined eager loading
to not render a SELECT subquery, changes to lazy loading such that
the "secondary" target is properly included in the SELECT, and
changes to declarative to better support specification of a
join() object with classes as targets.
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automatic reflection support for the "secondary" table referred
to by a :func:`.relationship`. "secondary", when specified
either as a string table name, or as a :class:`.Table` object with
only a name and :class:`.MetaData` object will also be included
in the reflection process when :meth:`.DeferredReflection.prepare`
is called. [ticket:2865]
- clsregistry._resolver() now uses a stateful _class_resolver()
class in order to handle the work of mapping strings to
objects. This is to provide for simpler extensibility, namely
a ._resolvers collection of ad-hoc name resolution functions;
the DeferredReflection class adds its own resolver here in order
to handle relationship(secondary) names which generate new
Table objects.
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as the string name of a class or other argument within
declarative using :func:`.relationship`.
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by name in a string argument used with ``order_by``,
``primaryjoin``, or similar in :func:`.relationship`,
in addition to column-bound attributes. [ticket:2761]
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- went through examples/ and cleaned out excess list() calls
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store ModuleMarkers for multiple roots, one for each token in a
module path. this allows partial path resolution.
- docs to this effect
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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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