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Fixed that loading including associations returns all results if Load IDs For Limited Eager Loading returns none (closes #4528) [Rick]

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Stop respond_to? from throwing when instances are created 'irregularly' i.e. yaml loads.  [zenspider] Closes #4587


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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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Multiple fixes and optimizations in PostgreSQL adapter, allowing ruby-postgres gem to work properly. Closes #4461


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Fixed that AssociationCollection#delete_all should work even if the records of the association are not loaded yet. [Florian Weber]


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Changed those private ActiveRecord methods to take optional third argument :auto instead of nil for performance optimizations.  (closes #4456) [Stefan]

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Private ActiveRecord methods add_limit, add_joins, and add_conditions take an OPTIONAL third argument 'scope' (closes #4456) [Rick]

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Fixed that records returned from has_and_belongs_to_many associations with additional attributes should be marked as read only (fixes #4512) [DHH] DEPRECATED: Using additional attributes on has_and_belongs_to_many associations. Instead upgrade your association to be a real join model [DHH]

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Do not implicitly mark recordss of has_many :through as readonly but do mark habtm records as readonly (eventually only on join tables without rich attributes).

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Fixed eager loading so that an aliased table cannot clash with a has_and_belongs_to_many join table [Rick]

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Remove overrated warning from adapter_test




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Support the use of public synonyms with the Oracle adapter; required ruby-oci8 v0.1.14 (closes #4390) [schoenm@earthlink.net]

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