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When inserting new records, only the fields which have been changed
from the defaults will actually be included in the INSERT statement.
The other fields will be populated by the database.
This is more efficient, and also means that it will be safe to
remove database columns without getting subsequent errors in running
app processes (so long as the code in those processes doesn't
contain any references to the removed column).
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Use template0 option for creating activerecord test databases in build_database task with postgres
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build_database task
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65843e1acc0c8d285ff79f8c9c49d4d1215440be
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i.e. Oracle database does not support these isolation levels.
`:read_uncommitted` `:repeatable_read`
This commit also works with other databases which do not support
these isolation levels.
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Fix collisions with before and after validation callbacks.
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This commit allows a user to do something like:
before_validation :do_stuff, :on => [ :create, :update ]
after_validation :do_more, :on => [ :create, :update ]
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Related to 761bc751d31c22e2c2fdae2b4cdd435b68b6d783 and
eb876c4d07130f15be2cac7be968cc393f959c62
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This reverts commit 761bc751d31c22e2c2fdae2b4cdd435b68b6d783.
This commit wasn't fixing any issue just using the same table for
different models with different primary keys.
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set utf8_unicode_ci collation on latin1 table.
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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.
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Callbacks may interfere with each other.
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Fixes #3458.
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It's too hard to test this properly, so let's just check that there are
no errors.
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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.
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jcoleman/should-unset-association-when-an-existing-record-is-destroyed
Unset association when existing record is destroyed.
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To avoid foreign key errors (and invalid data) in the database, when a belongs_to association is destroyed, it should also be nil'd out on the parent object.
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Freeze columns before using them as hash keys
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This reduces the number of allocated strings from columns * (rows + 1) to just columns.
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AR::Base#attributes= is just an alias for AR::Base#assign_attributes
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db:structure:load
"
Breaks db:setup because it tries to load the environment before creating the database.
This reverts commit 5ca11fefce6d83f5db399aa4412f1f1a0d42b2e6.
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Closes #6960
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reference to mass_assignment options
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references to mass assignment options
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Integrate strong_parameters in Rails 4
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