This reverts commit 761bc751d31c22e2c2fdae2b4cdd435b68b6d783.
This commit wasn't fixing any issue just using the same table for
different models with different primary keys.
This reverts commit f5654e78b248ecc90e8556366c927e1176c2428f.
Conflicts:
actionmailer/lib/action_mailer/base.rb
Reason: @frodsan asked me to revert since this change is breaking the
documentation in the edge API site
Conflicts:
actionmailer/lib/action_mailer/base.rb
activesupport/lib/active_support/configurable.rb
activesupport/lib/active_support/core_ext/module/deprecation.rb
guides/source/action_controller_overview.md
guides/source/active_support_core_extensions.md
guides/source/ajax_on_rails.textile
guides/source/association_basics.textile
guides/source/upgrading_ruby_on_rails.md
While resolving conflicts, I have chosen to ignore changes done in
docrails at some places - these will be most likely 1.9 hash syntax
changes.
If your database supports setting the isolation level for a transaction,
you can set it like so:
Post.transaction(isolation: :serializable) do
# ...
end
Valid isolation levels are:
* `:read_uncommitted`
* `:read_committed`
* `:repeatable_read`
* `:serializable`
You should consult the documentation for your database to understand the
semantics of these different levels:
* http://www.postgresql.org/docs/9.1/static/transaction-iso.html
* https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html
An `ActiveRecord::TransactionIsolationError` will be raised if:
* The adapter does not support setting the isolation level
* You are joining an existing open transaction
* You are creating a nested (savepoint) transaction
The mysql, mysql2 and postgresql adapters support setting the
transaction isolation level. However, support is disabled for mysql
versions below 5, because they are affected by a bug
(http://bugs.mysql.com/bug.php?id=39170) which means the isolation level
gets persisted outside the transaction.
CHANGELOG edits do not belongs on docrails, so I'll send a pull request
instead. Thanks @rafaelfranca for catching this.
This reverts commit 84c9491eab5b9f7c4250ca4c2ca5d763e8c4ff4d.
