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* Confirm a record has not already been destroyed before decrementing counter cache.
*Ben Tucker*
* Fixed a bug in `ActiveRecord#sanitize_sql_hash_for_conditions` in which
`self.class` is an argument to `PredicateBuilder#build_from_hash`
causing `PredicateBuilder` to call non-existent method
`Class#reflect_on_association`.
*Zach Ohlgren*
* While removing index if column option is missing then raise IrreversibleMigration exception.
Following code should raise `IrreversibleMigration`. But the code was
failing since options is an array and not a hash.
def change
change_table :users do |t|
t.remove_index [:name, :email]
end
end
Fix was to check if the options is a Hash before operating on it.
Fixes #10419.
*Neeraj Singh*
* Do not overwrite manually built records during one-to-one nested attribute assignment
For one-to-one nested associations, if you build the new (in-memory)
child object yourself before assignment, then the NestedAttributes
module will not overwrite it, e.g.:
class Member < ActiveRecord::Base
has_one :avatar
accepts_nested_attributes_for :avatar
def avatar
super || build_avatar(width: 200)
end
end
member = Member.new
member.avatar_attributes = {icon: 'sad'}
member.avatar.width # => 200
*Olek Janiszewski*
* 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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