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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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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Fixed DB2 adapter so nullable columns will be determines correctly now and quotes from column default values will be removed (closes #4350) [contact@maik-schmidt.de]

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Fixed that schema changes while the database was open would break any connections to a SQLite database (now we reconnect if that error is throw) [DHH]

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Don't classify the has_one class when eager loading, it is already singular. Add tests. (closes #4117) [jonathan@bluewire.net.nz]

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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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Fixed has_many :through to include :conditions set on the :through association. closes #4020 [jonathan@bluewire.net.nz]

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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 eager loading from belongs_to would cause the association to be double-singularized (closes #4117) [jonathan@bluewire.net.nz]

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Added OpenBase database adapter that builds on top of the http://www.spice-of-life.net/ruby-openbase/ driver. All functionality except LIMIT/OFFSET is supported (closes #3528) [derrickspell@cdmplus.com]

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Rework table aliasing to account for truncated table aliases.  Add smarter table aliasing when doing eager loading of STI associations. This allows you to use the association name in the order/where clause. [Jonathan Viney / Rick Olson] closes #4108

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Add AbstractAdapter#table_alias_for to create table aliases according to the rules of the current adapter. [Rick]

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Provide access to the underlying database connection with Adapter#raw_connection, allows the use of db-specific methods such as postgresql's lo_* . Closes #2090


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Remove broken attempts at handling columns with a a default of 'now()' in the postgresql adapter. Closes #2257


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Added connection#current_database that'll return of the current database (only works in MySQL, SQL Server, and Oracle so far -- please help implement for the rest of the adapters) (closes #3663) [Tom ward]

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