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* fixes bug introduced by #3329. Now, when autosaving associations,
deletions happen before inserts and saves. This prevents a 'duplicate
unique value' database error that would occur if a record being created had
the same value on a unique indexed field as that of a record being destroyed.
*Johnny Holton*
* Handle aliased attributes in ActiveRecord::Relation.
When using symbol keys, ActiveRecord will now translate aliased attribute names to the actual column name used in the database:
With the model
class Topic
alias_attribute :heading, :title
end
The call
Topic.where(heading: 'The First Topic')
should yield the same result as
Topic.where(title: 'The First Topic')
This also applies to ActiveRecord::Relation::Calculations calls such as `Model.sum(:aliased)` and `Model.pluck(:aliased)`.
This will not work with SQL fragment strings like `Model.sum('DISTINCT aliased')`.
*Godfrey Chan*
* Mute `psql` output when running rake db:schema:load.
*Godfrey Chan*
* Trigger a save on `has_one association=(associate)` when the associate contents have changed.
Fix #8856.
*Chris Thompson*
* Abort a rake task when missing db/structure.sql like `db:schema:load` task.
*kennyj*
* rake:db:test:prepare falls back to original environment after execution.
*Slava Markevich*
Please check [4-0-stable](https://github.com/rails/rails/blob/4-0-stable/activerecord/CHANGELOG.md) for previous changes.
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