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Added descriptive error messages for invalid has_many :through associations: going through :has_one or :has_and_belongs_to_many [Rick]
Added support for going through a polymorphic has_many association: (closes #4401) [Rick]


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Change has_many :through to use the :source option to specify the source association.  :class_name is now ignored. [Rick Olson]

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Allow has_many :through associations to find the source association by setting a custom class (closes #4307) [jonathan@bluewire.net.nz]

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Raise error when trying to select many polymorphic objects with has_many :through or :include (closes #4226) [josh@hasmanythrough.com]

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Fix that has_many :through honors the foreign key set by the belongs_to association in the join model (closes #4259) [andylien@gmail.com / Rick]

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Fixed that reflections would bleed across class boundaries in single-table inheritance setups (closes #3796) [lars@pind.com]

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Reflections don't attempt to resolve module nesting of association classes. Simplify type computation.

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Added option to Base.reflection_of_all_associations to specify a specific association to scope the call. For example Base.reflection_of_all_associations(:has_many) [DHH]

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Added preliminary support for join models [DHH] Added preliminary support for polymorphic associations [DHH] Refactored associations to use reflections to get DRYer, beware, major refactoring -- double check before deploying anything with this (all tests pass, but..)

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 Split association reflection test into has_many and has_one tests.  TODO: extend to belongs_to and habtm as well.  Kill trailing whitespace.
 r2980@asus:  jeremy | 2005-07-10 01:53:41 -0700
 Test that eager load of firm.account (a has_one) returns the correct account.  This doesn't cover the regression in Ticket #1688, however.  Need a case where class name is not provided and the singular name is over-singularized by active_record.class_name.  Kill trailing whitespace.
 r2981@asus:  jeremy | 2005-07-10 01:56:44 -0700
 Fix class name resolution in AssociationReflection#name_to_class_name.  Use the equivalent of the idiomatic ||= (read or write if nil) for the class_inheritable_attribute reflection arrays.  Kill trailing whitespace.
 r2982@asus:  jeremy | 2005-07-10 01:59:08 -0700
 Remove superfluous assignment in compute_type.  In an inject, the return value is used for the next injection, so assigning to the injected value is unnecessary.


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Added MacroReflection#macro which will return a symbol describing the macro used (like :composed_of or :has_many) #718, #248 [james@slashetc.com]

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