Wrap overview documentation for ActiveRecord::Transactions::ClassMethods so that it's easier to read in a text editor with word wrapping enabled.

Add overview description for ActiveRecord::Transactions, telling the reader to look at ClassMethods instead.

Previously this would have committed the transaction but not carried out save or destroy operation.

[#891 state:committed]
Signed-off-by: NMichael Koziarski <michael@koziarski.com>

Move the transaction counter to the connection object rather than maintaining it on the current Thread.
Signed-off-by: NMichael Koziarski <michael@koziarski.com>
[#533 state:resolved]

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

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Removed documentation for the removed rollback! method on transactions and mention ActiveRecord::Rollback [cody]


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Explain semantics of having several different AR instances in a transaction block. Closes #9036 [jacobat, Marcel Molina]

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 * Generate Reader and Writer methods which cache attribute values in hashes.  This is to avoid repeatedly parsing the same date or integer columns.
 * Move the attribute related methods out to attribute_methods.rb to de-clutter base.rb
 * Change exception raised when users use find with :select then try to access a skipped column.  Plugins could override missing_attribute() to lazily load the columns.
 * Move method definition to the class, instead of the instance
 * Always generate the readers, writers and predicate methods.


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Remove deprecated object transactions.  People relying on this functionality should install the object_transactions plugin at http://code.bitsweat.net/svn/object_transactions.  Closes #5637 [Koz, Jeremy Kemper]



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Added database connection as a yield parameter to ActiveRecord::Base.transaction so you can manually rollback [DHH]

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Rollback #new_record? and #id values for created records that rollback in an after_save callback. Closes #6910 [Ben Curren]

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 locking
 r4645@asus:  jeremy | 2006-06-17 12:41:30 -0700
 missing reply fixture
 r4646@asus:  jeremy | 2006-06-19 13:05:23 -0700
 Use a per-thread (rather than global) transaction mutex so you may execute concurrent transactions on separate connections.
 r4647@asus:  jeremy | 2006-06-19 13:07:23 -0700
 PostgreSQL: introduce allow_concurrency option which determines whether to use blocking or asynchronous #execute. Adapters with blocking #execute will deadlock Ruby threads. The default value is ActiveRecord::Base.allow_concurrency.
 r4648@asus:  jeremy | 2006-06-19 13:08:40 -0700
 Pass the default allow_concurrency when instantiating new connections.
 r4649@asus:  jeremy | 2006-06-19 13:11:12 -0700
 Break out concurrent transaction tests and run them for PostgreSQLAdapter only (need to fork or system('some_test_script') for the other adapters)
 r4650@asus:  jeremy | 2006-06-19 13:42:48 -0700
 Row locking. Provide a locking clause with the :lock finder option or true for the default "FOR UPDATE".
 r4661@asus:  jeremy | 2006-06-19 15:36:51 -0700
 excise the junk mutex


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Added AbstractAdapter#select_value and AbstractAdapter#select_values as convenience methods for selecting single values, instead of hashes, of the first column in a SELECT #2283

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Added rollbacks of transactions if they're active as the dispatcher is killed gracefully (TERM signal) #1054 [Leon Bredt]

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Transactions are now actually working on the database level on save, but thread safety is currently out the window. Andreas is working on it

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Fixed that nested transactions now work by letting the outer most transaction have the responsibilty of starting and rolling back the transaction. If any of the inner transactions swallow the exception raised, though, the transaction will not be rolled back. So always let the transaction bubble up even when you've dealt with local issues. Closes #231 and #340.

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