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* Rails now automatically detects inverse associations. If you do not set the
`:inverse_of` option on the association, then Active Record will guess the
inverse association based on heuristics.
Note that automatic inverse detection only works on `has_many`, `has_one`,
and `belongs_to` associations. Extra options on the associations will
also prevent the association's inverse from being found automatically.
The automatic guessing of the inverse association uses a heuristic based
on the name of the class, so it may not work for all associations,
especially the ones with non-standard names.
You can turn off the automatic detection of inverse associations by setting
the `:inverse_of` option to `false` like so:
class Taggable < ActiveRecord::Base
belongs_to :tag, inverse_of: false
end
*John Wang*
* Fix `add_column` with `array` option when using PostgreSQL. Fixes #10432
*Adam Anderson*
* Usage of `implicit_readonly` is being removed`. Please use `readonly` method
explicitly to mark records as `readonly.
Fixes #10615.
Example:
user = User.joins(:todos).select("users.*, todos.title as todos_title").readonly(true).first
user.todos_title = 'clean pet'
user.save! # will raise error
*Yves Senn*
* Fix the `:primary_key` option for `has_many` associations.
Fixes #10693.
*Yves Senn*
* Fix bug where tiny types are incorectly coerced as booleand when the length is more than 1.
Fixes #10620.
*Aaron Peterson*
* Also support extensions in PostgreSQL 9.1. This feature has been supported since 9.1.
*kennyj*
* Deprecate `ConnectionAdapters::SchemaStatements#distinct`,
as it is no longer used by internals.
*Ben Woosley#
* Fix pending migrations error when loading schema and `ActiveRecord::Base.table_name_prefix`
is not blank.
Call `assume_migrated_upto_version` on connection to prevent it from first
being picked up in `method_missing`.
In the base class, `Migration`, `method_missing` expects the argument to be a
table name, and calls `proper_table_name` on the arguments before sending to
`connection`. If `table_name_prefix` or `table_name_suffix` is used, the schema
version changes to `prefix_version_suffix`, breaking `rake test:prepare`.
Fixes #10411.
*Kyle Stevens*
* Method `read_attribute_before_type_cast` should accept input as symbol.
*Neeraj Singh*
* 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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