Setting with_polymorphic at mapper configuration time
------------------------------------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The :func:`.orm.with_polymorphic` function serves the purpose of allowing
"eager" loading of attributes from subclass tables, as well as the ability
to help with these patterns which are described at :ref:`concrete_polymorphic`.
Setting with_polymorphic against a query
-----------------------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The :func:`.orm.with_polymorphic` function evolved from a query-level
method :meth:`.Query.with_polymorphic`. This method has the same purpose
.. _eagerloading_polymorphic_subtypes:
Eager Loading of Specific or Polymorphic Subtypes
-++++++++++++++++++++++++++++++++++++++++++++++++++
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The :func:`.joinedload`, :func:`.subqueryload`, :func:`.contains_eager` and
other eagerloader options support