diff options
Diffstat (limited to 'activerecord/CHANGELOG.md')
| -rw-r--r-- | activerecord/CHANGELOG.md | 54 |
1 files changed, 37 insertions, 17 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md index 756a0d7196..04b67cdf3a 100644 --- a/activerecord/CHANGELOG.md +++ b/activerecord/CHANGELOG.md @@ -1,5 +1,40 @@ ## Rails 4.0.0 (unreleased) ## +* Support for specifying transaction isolation level + + 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. + + *Jon Leighton* + * `ActiveModel::ForbiddenAttributesProtection` is included by default in Active Record models. Check the docs of `ActiveModel::ForbiddenAttributesProtection` for more details. @@ -10,7 +45,7 @@ `ActiveModel::MassAssignmentSecurity`, `protected_attributes` gem should be added to use `attr_accessible`/`attr_protected`. Mass assignment options has been removed from all the AR methods that - used it (ex. AR::Base.new, AR::Base.create, AR::Base#update_attributes, etc) + used it (ex. `AR::Base.new`, `AR::Base.create`, `AR::Base#update_attributes`, etc). *Guillermo Iguaran* @@ -41,21 +76,6 @@ *kennyj* -* Fix `find_in_batches` when primary_key is set other than id. - You can now use this method with the primary key which is not integer-based. - - Example: - - class Post < ActiveRecord::Base - self.primary_key = :title - end - - Post.find_in_batches(start: 'My First Post') do |batch| - batch.each { |post| post.author.greeting } - end - - *Toshiyuki Kawanishi* - * You can now override the generated accessor methods for stored attributes and reuse the original behavior with `read_store_attribute` and `write_store_attribute`, which are counterparts to `read_attribute` and `write_attribute`. @@ -91,7 +111,7 @@ create_table :table_with_arrays do |t| t.integer :int_array, array: true # integer[] - t.integer :int_array, array: true, :length => 2 + t.integer :int_array, array: true, length: 2 # smallint[] t.string :string_array, array: true, length: 30 # char varying(30)[] |