## Rails 5.0.0.beta4 (April 27, 2016) ##
* PostgreSQL: Support Expression Indexes and Operator Classes.
Example:
create_table :users do |t|
t.string :name
t.index 'lower(name) varchar_pattern_ops'
end
Fixes #19090, #21765, #21819, #24359.
*Ryuta Kamizono*
* MySQL: Prepared statements support.
To enable, set `prepared_statements: true` in config/database.yml.
Requires mysql2 0.4.4+.
*Ryuta Kamizono*
* Schema dumper: Indexes are now included in the `create_table` block
instead of listed afterward as separate `add_index` lines.
This tidies up schema.rb and makes it easy to read as a list of tables.
Bonus: Allows databases that support it (MySQL) to perform as single
`CREATE TABLE` query, no additional query per index.
*Ryuta Kamizono*
* SQLite: Fix uniqueness validation when values exceed the column limit.
SQLite doesn't impose length restrictions on strings, BLOBs, or numeric
values. It treats them as helpful metadata. When we truncate strings
before checking uniqueness, we'd miss values that exceed the column limit.
Other databases enforce length limits. A large value will pass uniqueness
validation since the column limit guarantees no value that long exists.
When we insert the row, it'll raise `ActiveRecord::ValueTooLong` as we
expect.
This fixes edge-case incorrect validation failures for values that exceed
the column limit but are identical to an existing value *when truncated*.
Now these will pass validation and raise an exception.
*Ryuta Kamizono*
* Raise `ActiveRecord::ValueTooLong` when column limits are exceeded.
Supported by MySQL and PostgreSQL adapters.
*Ryuta Kamizono*
* Migrations: `#foreign_key` respects `table_name_prefix` and `_suffix`.
*Ryuta Kamizono*
* SQLite: Force NOT NULL primary keys.
From SQLite docs: https://www.sqlite.org/lang_createtable.html
According to the SQL standard, PRIMARY KEY should always imply NOT
NULL. Unfortunately, due to a bug in some early versions, this is not
the case in SQLite. Unless the column is an INTEGER PRIMARY KEY or the
table is a WITHOUT ROWID table or the column is declared NOT NULL,
SQLite allows NULL values in a PRIMARY KEY column. SQLite could be
fixed to conform to the standard, but doing so might break legacy
applications. Hence, it has been decided to merely document the fact
that SQLite allowing NULLs in most PRIMARY KEY columns.
Now we override column options to explicitly set NOT NULL rather than rely
on implicit NOT NULL like MySQL and PostgreSQL adapters.
*Ryuta Kamizono*
* Added notice when a database is successfully created or dropped.
Example:
$ bin/rails db:create
Created database 'blog_development'
Created database 'blog_test'
$ bin/rails db:drop
Dropped database 'blog_development'
Dropped database 'blog_test'
Changed older notices
`blog_development already exists` to `Database 'blog_development' already exists`.
and
`Couldn't drop blog_development` to `Couldn't drop database 'blog_development'`.
*bogdanvlviv*
* Database comments. Annotate database objects (tables, columns, indexes)
with comments stored in database metadata. PostgreSQL & MySQL support.
create_table :pages, force: :cascade, comment: 'CMS content pages' do |t|
t.string :path, comment: 'Path fragment of page URL used for routing'
t.string :locale, comment: 'RFC 3066 locale code of website language section'
t.index [:path, :locale], comment: 'Look up pages by URI'
end
*Andrey Novikov*
* Add `quoted_time` for truncating the date part of a TIME column value.
This fixes queries on TIME column on MariaDB, as it doesn't ignore the
date part of the string when it coerces to time.
*Ryuta Kamizono*
* Properly accept all valid JSON primitives in the JSON data type.
Fixes #24234
*Sean Griffin*
* MariaDB 5.3+ supports microsecond datetime precision.
*Jeremy Daer*
* Delegate `none?` and `one?`. Now they can be invoked as model class methods.
Example:
# When no record is found on the table
Topic.none? # => true
# When only one record is found on the table
Topic.one? # => true
*Kenta Shirai*
* The form builder now properly displays values when passing a proc form
default to the attributes API.
Fixes #24249.
*Sean Griffin*
* The schema cache is now cleared after the `db:migrate` task is run.
Closes #24273.
*Chris Arcand*
* MySQL: strict mode respects other SQL modes rather than overwriting them.
Setting `strict: true` adds `STRICT_ALL_TABLES` to `sql_mode`. Setting
`strict: false` removes `STRICT_TRANS_TABLES`, `STRICT_ALL_TABLES`, and
`TRADITIONAL` from `sql_mode`.
*Ryuta Kamizono*
* Execute default_scope defined by abstract class in the context of subclass.
Fixes #23413.
Fixes #10658.
*Mehmet Emin İNAÇ*
* Fix an issue when preloading associations with extensions.
Previously every association with extension methods was transformed into an
instance dependent scope. This is no longer the case.
Fixes #23934.
*Yves Senn*
* Deprecate `{insert|update|delete}_sql` in `DatabaseStatements`.
Use the `{insert|update|delete}` public methods instead.
*Ryuta Kamizono*
* Added a configuration option to have active record raise an ArgumentError
if the order or limit is ignored in a batch query, rather than logging a
warning message.
*Scott Ringwelski*
* Honour the order of the joining model in a `has_many :through` association when eager loading.
Example:
The below will now follow the order of `by_lines` when eager loading `authors`.
class Article < ActiveRecord::Base
has_many :by_lines, -> { order(:position) }
has_many :authors, through: :by_lines
end
Fixes #17864.
*Yasyf Mohamedali*, *Joel Turkel*
* Ensure that the Suppressor runs before validations.
This moves the suppressor up to be run before validations rather than after
validations. There's no reason to validate a record you aren't planning on saving.
*Eileen M. Uchitelle*
## Rails 5.0.0.beta3 (February 24, 2016) ##
* Save many-to-many objects based on association primary key.
Fixes #20995.
*himesh-r*
* Ensure that mutations of the array returned from `ActiveRecord::Relation#to_a`
do not affect the original relation, by returning a duplicate array each time.
This brings the behavior in line with `CollectionProxy#to_a`, which was
already more careful.
*Matthew Draper*
* Fixed `where` for polymorphic associations when passed an array containing different types.
Fixes #17011.
Example:
PriceEstimate.where(estimate_of: [Treasure.find(1), Car.find(2)])
# => SELECT "price_estimates".* FROM "price_estimates"
WHERE (("price_estimates"."estimate_of_type" = 'Treasure' AND "price_estimates"."estimate_of_id" = 1)
OR ("price_estimates"."estimate_of_type" = 'Car' AND "price_estimates"."estimate_of_id" = 2))
*Philippe Huibonhoa*
* Fix a bug where using `t.foreign_key` twice with the same `to_table` within
the same table definition would only create one foreign key.
*George Millo*
* Fix a regression on has many association, where calling a child from parent in child's callback
results in same child records getting added repeatedly to target.
Fixes #13387.
*Bogdan Gusiev*, *Jon Hinson*
* Rework `ActiveRecord::Relation#last`.
1. Never perform additional SQL on loaded relation
2. Use SQL reverse order instead of loading relation if relation doesn't have limit
3. Deprecated relation loading when SQL order can not be automatically reversed
Topic.order("title").load.last(3)
# before: SELECT ...
# after: No SQL
Topic.order("title").last
# before: SELECT * FROM `topics`
# after: SELECT * FROM `topics` ORDER BY `topics`.`title` DESC LIMIT 1
Topic.order("coalesce(author, title)").last
# before: SELECT * FROM `topics`
# after: Deprecation Warning for irreversible order
*Bogdan Gusiev*
* Allow `joins` to be unscoped.
Fixes #13775.
*Takashi Kokubun*
* Add ActiveRecord `#second_to_last` and `#third_to_last` methods.
*Brian Christian*
* Added `numeric` helper into migrations.
Example:
create_table(:numeric_types) do |t|
t.numeric :numeric_type, precision: 10, scale: 2
end
*Mehmet Emin İNAÇ*
* Bumped the minimum supported version of PostgreSQL to >= 9.1.
Both PG 9.0 and 8.4 are past their end of life date:
http://www.postgresql.org/support/versioning/
*Remo Mueller*
## Rails 5.0.0.beta2 (February 01, 2016) ##
* `ActiveRecord::Relation#reverse_order` throws `ActiveRecord::IrreversibleOrderError`
when the order can not be reversed using current trivial algorithm.
Also raises the same error when `#reverse_order` is called on
relation without any order and table has no primary key:
Topic.order("concat(author_name, title)").reverse_order
# Before: SELECT `topics`.* FROM `topics` ORDER BY concat(author_name DESC, title) DESC
# After: raises ActiveRecord::IrreversibleOrderError
Edge.all.reverse_order
# Before: SELECT `edges`.* FROM `edges` ORDER BY `edges`.`` DESC
# After: raises ActiveRecord::IrreversibleOrderError
*Bogdan Gusiev*
* Improve schema_migrations insertion performance by inserting all versions
in one INSERT SQL.
*Akira Matsuda*, *Naoto Koshikawa*
* Using `references` or `belongs_to` in migrations will always add index
for the referenced column by default, without adding `index: true` option
to generated migration file. Users can opt out of this by passing
`index: false`.
Fixes #18146.
*Matthew Draper*, *Prathamesh Sonpatki*
* Run `type` attributes through attributes API type-casting before
instantiating the corresponding subclass. This makes it possible to define
custom STI mappings.
Fixes #21986.
*Yves Senn*
* Don't try to quote functions or expressions passed to `:default` option if
they are passed as procs.
This will generate proper query with the passed function or expression for
the default option, instead of trying to quote it in incorrect fashion.
Example:
create_table :posts do |t|
t.datetime :published_at, default: -> { 'NOW()' }
end
*Ryuta Kamizono*
* Fix regression when loading fixture files with symbol keys.
Fixes #22584.
*Yves Senn*
* Use `version` column as primary key for schema_migrations table because
`schema_migrations` versions are guaranteed to be unique.
This makes it possible to use `update_attributes` on models that do
not have a primary key.
*Richard Schneeman*
* Add short-hand methods for text and blob types in MySQL.
In Pg and Sqlite3, `:text` and `:binary` have variable unlimited length.
But in MySQL, these have limited length for each types (ref #21591, #21619).
This change adds short-hand methods for each text and blob types.
Example:
create_table :foos do |t|
t.tinyblob :tiny_blob
t.mediumblob :medium_blob
t.longblob :long_blob
t.tinytext :tiny_text
t.mediumtext :medium_text
t.longtext :long_text
end
*Ryuta Kamizono*
* Take into account UTC offset when assigning string representation of
timestamp with offset specified to attribute of time type.
*Andrey Novikov*
* When calling `first` with a `limit` argument, return directly from the
`loaded?` records if available.
*Ben Woosley*
* Deprecate sending the `offset` argument to `find_nth`. Please use the
`offset` method on relation instead.
*Ben Woosley*
## Rails 5.0.0.beta1 (December 18, 2015) ##
* Limit record touching to once per transaction.
If you have a parent/grand-parent relation like:
Comment belongs_to :message, touch: true
Message belongs_to :project, touch: true
Project belongs_to :account, touch: true
When the lowest entry(`Comment`) is saved, now, it won't repeat the touch
call multiple times for the parent records.
Related #18606.
*arthurnn*
* Order the result of `find(ids)` to match the passed array, if the relation
has no explicit order defined.
Fixes #20338.
*Miguel Grazziotin*, *Matthew Draper*
* Omit default limit values in dumped schema. It's tidier, and if the defaults
change in the future, we can address that via Migration API Versioning.
*Jean Boussier*
* Support passing the schema name as a prefix to table name in
`ConnectionAdapters::SchemaStatements#indexes`. Previously the prefix would
be considered a full part of the index name, and only the schema in the
current search path would be considered.
*Grey Baker*
* Ignore index name in `index_exists?` and `remove_index` when not passed a
name to check for.
*Grey Baker*
* Extract support for the legacy `mysql` database adapter from core. It will
live on in a separate gem for now, but most users should just use `mysql2`.
*Abdelkader Boudih*
* ApplicationRecord is a new superclass for all app models, analogous to app
controllers subclassing ApplicationController instead of
ActionController::Base. This gives apps a single spot to configure app-wide
model behavior.
Newly generated applications have `app/models/application_record.rb`
present by default.
*Genadi Samokovarov*
* Version the API presented to migration classes, so we can change parameter
defaults without breaking existing migrations, or forcing them to be
rewritten through a deprecation cycle.
New migrations specify the Rails version they were written for:
class AddStatusToOrders < ActiveRecord::Migration[5.0]
def change
# ...
end
end
*Matthew Draper*, *Ravil Bayramgalin*
* Use bind params for `limit` and `offset`. This will generate significantly
fewer prepared statements for common tasks like pagination. To support this
change, passing a string containing a comma to `limit` has been deprecated,
and passing an Arel node to `limit` is no longer supported.
Fixes #22250.
*Sean Griffin*
* Introduce after_{create,update,delete}_commit callbacks.
Before:
after_commit :add_to_index_later, on: :create
after_commit :update_in_index_later, on: :update
after_commit :remove_from_index_later, on: :destroy
After:
after_create_commit :add_to_index_later
after_update_commit :update_in_index_later
after_destroy_commit :remove_from_index_later
Fixes #22515.
*Genadi Samokovarov*
* Respect the column default values for `inheritance_column` when
instantiating records through the base class.
Fixes #17121.
Example:
# The schema of BaseModel has `t.string :type, default: 'SubType'`
subtype = BaseModel.new
assert_equals SubType, subtype.class
*Kuldeep Aggarwal*
* Fix `rake db:structure:dump` on Postgres when multiple schemas are used.
Fixes #22346.
*Nick Muerdter*, *ckoenig*
* Add schema dumping support for PostgreSQL geometric data types.
*Ryuta Kamizono*
* Except keys of `build_record`'s argument from `create_scope` in `initialize_attributes`.
Fixes #21893.
*Yuichiro Kaneko*
* Deprecate `connection.tables` on the SQLite3 and MySQL adapters.
Also deprecate passing arguments to `#tables`.
And deprecate `table_exists?`.
The `#tables` method of some adapters (mysql, mysql2, sqlite3) would return
both tables and views while others (postgresql) just return tables. To make
their behavior consistent, `#tables` will return only tables in the future.
The `#table_exists?` method would check both tables and views. To make
their behavior consistent with `#tables`, `#table_exists?` will check only
tables in the future.
*Yuichiro Kaneko*
* Improve support for non Active Record objects on `validates_associated`
Skipping `marked_for_destruction?` when the associated object does not responds
to it make easier to validate virtual associations built on top of Active Model
objects and/or serialized objects that implement a `valid?` instance method.
*Kassio Borges*, *Lucas Mazza*
* Change connection management middleware to return a new response with
a body proxy, rather than mutating the original.
*Kevin Buchanan*
* Make `db:migrate:status` to render `1_some.rb` format migrate files.
These files are in `db/migrate`:
* 1_valid_people_have_last_names.rb
* 20150819202140_irreversible_migration.rb
* 20150823202140_add_admin_flag_to_users.rb
* 20150823202141_migration_tests.rb
* 2_we_need_reminders.rb
* 3_innocent_jointable.rb
Before:
$ bundle exec rake db:migrate:status
...
Status Migration ID Migration Name
--------------------------------------------------
up 001 ********** NO FILE **********
up 002 ********** NO FILE **********
up 003 ********** NO FILE **********
up 20150819202140 Irreversible migration
up 20150823202140 Add admin flag to users
up 20150823202141 Migration tests
After:
$ bundle exec rake db:migrate:status
...
Status Migration ID Migration Name
--------------------------------------------------
up 001 Valid people have last names
up 002 We need reminders
up 003 Innocent jointable
up 20150819202140 Irreversible migration
up 20150823202140 Add admin flag to users
up 20150823202141 Migration tests
*Yuichiro Kaneko*
* Define `ActiveRecord::Sanitization.sanitize_sql_for_order` and use it inside
`preprocess_order_args`.
*Yuichiro Kaneko*
* Allow bigint with default nil for avoiding auto increment primary key.
*Ryuta Kamizono*
* Remove `DEFAULT_CHARSET` and `DEFAULT_COLLATION` in `MySQLDatabaseTasks`.
We should omit the collation entirely rather than providing a default.
Then the choice is the responsibility of the server and MySQL distribution.
*Ryuta Kamizono*
* Alias `ActiveRecord::Relation#left_joins` to
`ActiveRecord::Relation#left_outer_joins`.
*Takashi Kokubun*
* Use advisory locking to raise a `ConcurrentMigrationError` instead of
attempting to migrate when another migration is currently running.
*Sam Davies*
* Added `ActiveRecord::Relation#left_outer_joins`.
Example:
User.left_outer_joins(:posts)
# => SELECT "users".* FROM "users" LEFT OUTER JOIN "posts" ON
"posts"."user_id" = "users"."id"
*Florian Thomas*
* Support passing an array to `order` for SQL parameter sanitization.
*Aaron Suggs*
* Avoid disabling errors on the PostgreSQL connection when enabling the
`standard_conforming_strings` setting. Errors were previously disabled because
the setting wasn't writable in Postgres 8.1 and didn't exist in earlier
versions. Now Rails only supports Postgres 8.2+ we're fine to assume the
setting exists. Disabling errors caused problems when using a connection
pooling tool like PgBouncer because it's not guaranteed to have the same
connection between calls to `execute` and it could leave the connection
with errors disabled.
Fixes #22101.
*Harry Marr*
* Set `scope.reordering_value` to `true` if `:reordering`-values are specified.
Fixes #21886.
*Hiroaki Izu*
* Add support for bidirectional destroy dependencies.
Fixes #13609.
Example:
class Content < ActiveRecord::Base
has_one :position, dependent: :destroy
end
class Position < ActiveRecord::Base
belongs_to :content, dependent: :destroy
end
*Seb Jacobs*
* Includes HABTM returns correct size now. It's caused by the join dependency
only instantiates one HABTM object because the join table hasn't a primary key.
Fixes #16032.
Examples:
before:
Project.first.salaried_developers.size # => 3
Project.includes(:salaried_developers).first.salaried_developers.size # => 1
after:
Project.first.salaried_developers.size # => 3
Project.includes(:salaried_developers).first.salaried_developers.size # => 3
*Bigxiang*
* Add option to index errors in nested attributes
For models which have nested attributes, errors within those models will
now be indexed if `:index_errors` is specified when defining a
has_many relationship, or if its set in the global config.
Example:
class Guitar < ActiveRecord::Base
has_many :tuning_pegs, index_errors: true
accepts_nested_attributes_for :tuning_pegs
end
class TuningPeg < ActiveRecord::Base
belongs_to :guitar
validates_numericality_of :pitch
end
# Old style
guitar.errors["tuning_pegs.pitch"] = ["is not a number"]
# New style (if defined globally, or set in has_many_relationship)
guitar.errors["tuning_pegs[1].pitch"] = ["is not a number"]
*Michael Probber*, *Terence Sun*
* Exit with non-zero status for failed database rake tasks.
*Jay Hayes*
* Queries such as `Computer.joins(:monitor).group(:status).count` will now be
interpreted as `Computer.joins(:monitor).group('computers.status').count`
so that when `Computer` and `Monitor` have both `status` columns we don't
have conflicts in projection.
*Rafael Sales*
* Add ability to default to `uuid` as primary key when generating database migrations.
Example:
config.generators do |g|
g.orm :active_record, primary_key_type: :uuid
end
*Jon McCartie*
* Don't cache arguments in `#find_by` if they are an `ActiveRecord::Relation`.
Fixes #20817.
*Hiroaki Izu*
* Qualify column name inserted by `group` in calculation.
Giving `group` an unqualified column name now works, even if the relation
has `JOIN` with another table which also has a column of the name.
*Soutaro Matsumoto*
* Don't cache prepared statements containing an IN clause or a SQL literal, as
these queries will change often and are unlikely to have a cache hit.
*Sean Griffin*
* Fix `rewhere` in a `has_many` association.
Fixes #21955.
*Josh Branchaud*, *Kal*
* `where` raises ArgumentError on unsupported types.
Fixes #20473.
*Jake Worth*
* Add an immutable string type to help reduce memory usage for apps which do
not need mutation detection on strings.
*Sean Griffin*
* Give `ActiveRecord::Relation#update` its own deprecation warning when
passed an `ActiveRecord::Base` instance.
Fixes #21945.
*Ted Johansson*
* Make it possible to pass `:to_table` when adding a foreign key through
`add_reference`.
Fixes #21563.
*Yves Senn*
* No longer pass deprecated option `-i` to `pg_dump`.
*Paul Sadauskas*
* Concurrent `AR::Base#increment!` and `#decrement!` on the same record
are all reflected in the database rather than overwriting each other.
*Bogdan Gusiev*
* Avoid leaking the first relation we call `first` on, per model.
Fixes #21921.
*Matthew Draper*, *Jean Boussier*
* Remove unused `pk_and_sequence_for` in `AbstractMysqlAdapter`.
*Ryuta Kamizono*
* Allow fixtures files to set the model class in the YAML file itself.
To load the fixtures file `accounts.yml` as the `User` model, use:
_fixture:
model_class: User
david:
name: David
Fixes #9516.
*Roque Pinel*
* Don't require a database connection to load a class which uses acceptance
validations.
*Sean Griffin*
* Correctly apply `unscope` when preloading through associations.
*Jimmy Bourassa*
* Fixed taking precision into count when assigning a value to timestamp attribute.
Timestamp column can have less precision than ruby timestamp
In result in how big a fraction of a second can be stored in the
database.
m = Model.create!
m.created_at.usec == m.reload.created_at.usec # => false
# due to different precision in Time.now and database column
If the precision is low enough, (mysql default is 0, so it is always low
enough by default) the value changes when model is reloaded from the
database. This patch fixes that issue ensuring that any timestamp
assigned as an attribute is converted to column precision under the
attribute.
*Bogdan Gusiev*
* Introduce `connection.data_sources` and `connection.data_source_exists?`.
These methods determine what relations can be used to back Active Record
models (usually tables and views).
Also deprecate `SchemaCache#tables`, `SchemaCache#table_exists?` and
`SchemaCache#clear_table_cache!` in favor of their new data source
counterparts.
*Yves Senn*, *Matthew Draper*
* Add `ActiveRecord::Base.ignored_columns` to make some columns
invisible from Active Record.
*Jean Boussier*
* `ActiveRecord::Tasks::MySQLDatabaseTasks` fails if shellout to
mysql commands (like `mysqldump`) is not successful.
*Steve Mitchell*
* Ensure `select` quotes aliased attributes, even when using `from`.
Fixes #21488.
*Sean Griffin*, *@johanlunds*
* MySQL: support `unsigned` numeric data types.
Example:
create_table :foos do |t|
t.unsigned_integer :quantity
t.unsigned_bigint :total
t.unsigned_float :percentage
t.unsigned_decimal :price, precision: 10, scale: 2
end
The `unsigned: true` option may be used for the primary key:
create_table :foos, id: :bigint, unsigned: true do |t|
…
end
*Ryuta Kamizono*
* Add `#views` and `#view_exists?` methods on connection adapters.
*Ryuta Kamizono*
* Correctly dump composite primary key.
Example:
create_table :barcodes, primary_key: ["region", "code"] do |t|
t.string :region
t.integer :code
end
*Ryuta Kamizono*
* Lookup the attribute name for `restrict_with_error` messages on the
model class that defines the association.
*kuboon*, *Ronak Jangir*
* Correct query for PostgreSQL 8.2 compatibility.
*Ben Murphy*, *Matthew Draper*
* `bin/rails db:migrate` uses
`ActiveRecord::Tasks::DatabaseTasks.migrations_paths` instead of
`Migrator.migrations_paths`.
*Tobias Bielohlawek*
* Support dropping indexes concurrently in PostgreSQL.
See http://www.postgresql.org/docs/9.4/static/sql-dropindex.html for more
details.
*Grey Baker*
* Deprecate passing conditions to `ActiveRecord::Relation#delete_all`
and `ActiveRecord::Relation#destroy_all`.
*Wojciech Wnętrzak*
* Instantiating an AR model with `ActionController::Parameters` now raises
an `ActiveModel::ForbiddenAttributesError` if the parameters include a
`type` field that has not been explicitly permitted. Previously, the
`type` field was simply ignored in the same situation.
*Prem Sichanugrist*
* PostgreSQL, `create_schema`, `drop_schema` and `rename_table` now quote
schema names.
Fixes #21418.
Example:
create_schema("my.schema")
# CREATE SCHEMA "my.schema";
*Yves Senn*
* PostgreSQL, add `:if_exists` option to `#drop_schema`. This makes it
possible to drop a schema that might exist without raising an exception if
it doesn't.
*Yves Senn*
* Only try to nullify has_one target association if the record is persisted.
Fixes #21223.
*Agis Anastasopoulos*
* Uniqueness validator raises descriptive error when running on a persisted
record without primary key.
Fixes #21304.
*Yves Senn*
* Add a native JSON data type support in MySQL.
Example:
create_table :json_data_type do |t|
t.json :settings
end
*Ryuta Kamizono*
* Descriptive error message when fixtures contain a missing column.
Fixes #21201.
*Yves Senn*
* `ActiveRecord::Tasks::PostgreSQLDatabaseTasks` fail if shellout to
postgresql commands (like `pg_dump`) is not successful.
*Bryan Paxton*, *Nate Berkopec*
* Add `ActiveRecord::Relation#in_batches` to work with records and relations
in batches.
Available options are `of` (batch size), `load`, `start`, and `finish`.
Examples:
Person.in_batches.each_record(&:party_all_night!)
Person.in_batches.update_all(awesome: true)
Person.in_batches.delete_all
Person.in_batches.each do |relation|
relation.delete_all
sleep 10 # Throttles the delete queries
end
Fixes #20933.
*Sina Siadat*
* Added methods for PostgreSQL geometric data types to use in migrations.
Example:
create_table :foo do |t|
t.line :foo_line
t.lseg :foo_lseg
t.box :foo_box
t.path :foo_path
t.polygon :foo_polygon
t.circle :foo_circle
end
*Mehmet Emin İNAÇ*
* Add `cache_key` to ActiveRecord::Relation.
Example:
@users = User.where("name like ?", "%Alberto%")
@users.cache_key
# => "/users/query-5942b155a43b139f2471b872ac54251f-3-20150714212107656125000"
*Alberto Fernández-Capel*
* Properly allow uniqueness validations on primary keys.
Fixes #20966.
*Sean Griffin*, *presskey*
* Don't raise an error if an association failed to destroy when `destroy` was
called on the parent (as opposed to `destroy!`).
Fixes #20991.
*Sean Griffin*
* `ActiveRecord::RecordNotFound` modified to store model name, primary_key and
id of the caller model. It allows the catcher of this exception to make
a better decision to what to do with it.
Example:
class SomeAbstractController < ActionController::Base
rescue_from ActiveRecord::RecordNotFound, with: :redirect_to_404
private def redirect_to_404(e)
return redirect_to(posts_url) if e.model == 'Post'
raise
end
end
*Sameer Rahmani*
* Deprecate the keys for association `restrict_dependent_destroy` errors in favor
of new key names.
Previously `has_one` and `has_many` associations were using the
`one` and `many` keys respectively. Both of these keys have special
meaning in I18n (they are considered to be pluralizations) so by
renaming them to `has_one` and `has_many` we make the messages more explicit
and most importantly they don't clash with linguistical systems that need to
validate translation keys (and their pluralizations).
The `:'restrict_dependent_destroy.one'` key should be replaced with
`:'restrict_dependent_destroy.has_one'`, and `:'restrict_dependent_destroy.many'`
with `:'restrict_dependent_destroy.has_many'`.
*Roque Pinel*, *Christopher Dell*
* Fix state being carried over from previous transaction.
Considering the following example where `name` is a required attribute.
Before we had `new_record?` returning `true` for a persisted record:
author = Author.create! name: 'foo'
author.name = nil
author.save # => false
author.new_record? # => true
Fixes #20824.
*Roque Pinel*
* Correctly ignore `mark_for_destruction` when `autosave` isn't set to `true`
when validating associations.
Fixes #20882.
*Sean Griffin*
* Fix a bug where counter_cache doesn't always work with polymorphic
relations.
Fixes #16407.
*Stefan Kanev*, *Sean Griffin*
* Ensure that cyclic associations with autosave don't cause duplicate errors
to be added to the parent record.
Fixes #20874.
*Sean Griffin*
* Ensure that `ActionController::Parameters` can still be passed to nested
attributes.
Fixes #20922.
*Sean Griffin*
* Deprecate force association reload by passing a truthy argument to
association method.
For collection association, you can call `#reload` on association proxy to
force a reload:
@user.posts.reload # Instead of @user.posts(true)
For singular association, you can call `#reload` on the parent object to
clear its association cache then call the association method:
@user.reload.profile # Instead of @user.profile(true)
Passing a truthy argument to force association to reload will be removed in
Rails 5.1.
*Prem Sichanugrist*
* Replaced `ActiveSupport::Concurrency::Latch` with `Concurrent::CountDownLatch`
from the concurrent-ruby gem.
*Jerry D'Antonio*
* Fix through associations using scopes having the scope merged multiple
times.
Fixes #20721.
Fixes #20727.
*Sean Griffin*
* `ActiveRecord::Base.dump_schema_after_migration` applies migration tasks
other than `db:migrate`. (eg. `db:rollback`, `db:migrate:dup`, ...)
Fixes #20743.
*Yves Senn*
* Add alternate syntax to make `change_column_default` reversible.
User can pass in `:from` and `:to` to make `change_column_default` command
become reversible.
Example:
change_column_default :posts, :status, from: nil, to: "draft"
change_column_default :users, :authorized, from: true, to: false
*Prem Sichanugrist*
* Prevent error when using `force_reload: true` on an unassigned polymorphic
belongs_to association.
Fixes #20426.
*James Dabbs*
* Correctly raise `ActiveRecord::AssociationTypeMismatch` when assigning
a wrong type to a namespaced association.
Fixes #20545.
*Diego Carrion*
* `validates_absence_of` respects `marked_for_destruction?`.
Fixes #20449.
*Yves Senn*
* Include the `Enumerable` module in `ActiveRecord::Relation`
*Sean Griffin*, *bogdan*
* Use `Enumerable#sum` in `ActiveRecord::Relation` if a block is given.
*Sean Griffin*
* Let `WITH` queries (Common Table Expressions) be explainable.
*Vladimir Kochnev*
* Make `remove_index :table, :column` reversible.
*Yves Senn*
* Fixed an error which would occur in dirty checking when calling
`update_attributes` from a getter.
Fixes #20531.
*Sean Griffin*
* Make `remove_foreign_key` reversible. Any foreign key options must be
specified, similar to `remove_column`.
*Aster Ryan*
* Add `:_prefix` and `:_suffix` options to `enum` definition.
Fixes #17511, #17415.
*Igor Kapkov*
* Correctly handle decimal arrays with defaults in the schema dumper.
Fixes #20515.
*Sean Griffin*, *jmondo*
* Deprecate the PostgreSQL `:point` type in favor of a new one which will return
`Point` objects instead of an `Array`
*Sean Griffin*
* Ensure symbols passed to `ActiveRecord::Relation#select` are always treated
as columns.
Fixes #20360.
*Sean Griffin*
* Do not set `sql_mode` if `strict: :default` is specified.
# config/database.yml
production:
adapter: mysql2
database: foo_prod
user: foo
strict: :default
*Ryuta Kamizono*
* Allow proc defaults to be passed to the attributes API. See documentation
for examples.
*Sean Griffin*, *Kir Shatrov*
* SQLite: `:collation` support for string and text columns.
Example:
create_table :foo do |t|
t.string :string_nocase, collation: 'NOCASE'
t.text :text_rtrim, collation: 'RTRIM'
end
add_column :foo, :title, :string, collation: 'RTRIM'
change_column :foo, :title, :string, collation: 'NOCASE'
*Akshay Vishnoi*
* Allow the use of symbols or strings to specify enum values in test
fixtures:
awdr:
title: "Agile Web Development with Rails"
status: :proposed
*George Claghorn*
* Clear query cache when `ActiveRecord::Base#reload` is called.
*Shane Hender, Pierre Nespo*
* Include stored procedures and function on the MySQL structure dump.
*Jonathan Worek*
* Pass `:extend` option for `has_and_belongs_to_many` associations to the
underlying `has_many :through`.
*Jaehyun Shin*
* Deprecate `Relation#uniq` use `Relation#distinct` instead.
See #9683.
*Yves Senn*
* Allow single table inheritance instantiation to work when storing
demodulized class names.
*Alex Robbin*
* Correctly pass MySQL options when using `structure_dump` or
`structure_load`.
Specifically, it fixes an issue when using SSL authentication.
*Alex Coomans*
* Correctly dump `:options` on `create_table` for MySQL.
*Ryuta Kamizono*
* PostgreSQL: `:collation` support for string and text columns.
Example:
create_table :foos do |t|
t.string :string_en, collation: 'en_US.UTF-8'
t.text :text_ja, collation: 'ja_JP.UTF-8'
end
*Ryuta Kamizono*
* Remove `ActiveRecord::Serialization::XmlSerializer` from core.
*Zachary Scott*
* Make `unscope` aware of "less than" and "greater than" conditions.
*TAKAHASHI Kazuaki*
* `find_by` and `find_by!` raise `ArgumentError` when called without
arguments.
*Kohei Suzuki*
* Revert behavior of `db:schema:load` back to loading the full
environment. This ensures that initializers are run.
Fixes #19545.
*Yves Senn*
* Fix missing index when using `timestamps` with the `index` option.
The `index` option used with `timestamps` should be passed to both
`column` definitions for `created_at` and `updated_at` rather than just
the first.
*Paul Mucur*
* Rename `:class` to `:anonymous_class` in association options.
Fixes #19659.
*Andrew White*
* Autosave existing records on a has many through association when the parent
is new.
Fixes #19782.
*Sean Griffin*
* Fixed a bug where uniqueness validations would error on out of range values,
even if an validation should have prevented it from hitting the database.
*Andrey Voronkov*
* MySQL: `:charset` and `:collation` support for string and text columns.
Example:
create_table :foos do |t|
t.string :string_utf8_bin, charset: 'utf8', collation: 'utf8_bin'
t.text :text_ascii, charset: 'ascii'
end
*Ryuta Kamizono*
* Foreign key related methods in the migration DSL respect
`ActiveRecord::Base.pluralize_table_names = false`.
Fixes #19643.
*Mehmet Emin İNAÇ*
* Reduce memory usage from loading types on PostgreSQL.
Fixes #19578.
*Sean Griffin*
* Add `config.active_record.warn_on_records_fetched_greater_than` option.
When set to an integer, a warning will be logged whenever a result set
larger than the specified size is returned by a query.
Fixes #16463.
*Jason Nochlin*
* Ignore `.psqlrc` when loading database structure.
*Jason Weathered*
* Fix referencing wrong table aliases while joining tables of has many through
association (only when calling calculation methods).
Fixes #19276.
*pinglamb*
* Correctly persist a serialized attribute that has been returned to
its default value by an in-place modification.
Fixes #19467.
*Matthew Draper*
* Fix generating the schema file when using PostgreSQL `BigInt[]` data type.
Previously the `limit: 8` was not coming through, and this caused it to
become `Int[]` data type after rebuilding from the schema.
Fixes #19420.
*Jake Waller*
* Reuse the `CollectionAssociation#reader` cache when the foreign key is
available prior to save.
*Ben Woosley*
* Add `config.active_record.dump_schemas` to fix `db:structure:dump`
when using schema_search_path and PostgreSQL extensions.
Fixes #17157.
*Ryan Wallace*
* Renaming `use_transactional_fixtures` to `use_transactional_tests` for clarity.
Fixes #18864.
*Brandon Weiss*
* Increase pg gem version requirement to `~> 0.18`. Earlier versions of the
pg gem are known to have problems with Ruby 2.2.
*Matt Brictson*
* Correctly dump `serial` and `bigserial`.
*Ryuta Kamizono*
* Fix default `format` value in `ActiveRecord::Tasks::DatabaseTasks#schema_file`.
*James Cox*
* Don't enroll records in the transaction if they don't have commit callbacks.
This was causing a memory leak when creating many records inside a transaction.
Fixes #15549.
*Will Bryant*, *Aaron Patterson*
* Correctly create through records when created on a has many through
association when using `where`.
Fixes #19073.
*Sean Griffin*
* Add `SchemaMigration.create_table` support for any unicode charsets with MySQL.
*Ryuta Kamizono*
* PostgreSQL no longer disables user triggers if system triggers can't be
disabled. Disabling user triggers does not fulfill what the method promises.
Rails currently requires superuser privileges for this method.
If you absolutely rely on this behavior, consider patching
`disable_referential_integrity`.
*Yves Senn*
* Restore aborted transaction state when `disable_referential_integrity` fails
due to missing permissions.
*Toby Ovod-Everett*, *Yves Senn*
* In PostgreSQL, print a warning message if `disable_referential_integrity`
fails due to missing permissions.
*Andrey Nering*, *Yves Senn*
* Allow a `:limit` option for MySQL bigint primary key support.
Example:
create_table :foos, id: :primary_key, limit: 8 do |t|
end
# or
create_table :foos, id: false do |t|
t.primary_key :id, limit: 8
end
*Ryuta Kamizono*
* `belongs_to` will now trigger a validation error by default if the association is not present.
You can turn this off on a per-association basis with `optional: true`.
(Note this new default only applies to new Rails apps that will be generated with
`config.active_record.belongs_to_required_by_default = true` in initializer.)
*Josef Šimánek*
* Fixed `ActiveRecord::Relation#becomes!` and `changed_attributes` issues for type
columns.
Fixes #17139.
*Miklos Fazekas*
* Format the time string according to the precision of the time column.
*Ryuta Kamizono*
* Allow a `:precision` option for time type columns.
*Ryuta Kamizono*
* Add `ActiveRecord::Base.suppress` to prevent the receiver from being saved
during the given block.
For example, here's a pattern of creating notifications when new comments
are posted. (The notification may in turn trigger an email, a push
notification, or just appear in the UI somewhere):
class Comment < ActiveRecord::Base
belongs_to :commentable, polymorphic: true
after_create -> { Notification.create! comment: self,
recipients: commentable.recipients }
end
That's what you want the bulk of the time. A new comment creates a new
Notification. There may be edge cases where you don't want that, like
when copying a commentable and its comments, in which case write a
concern with something like this:
module Copyable
def copy_to(destination)
Notification.suppress do
# Copy logic that creates new comments that we do not want triggering
# notifications.
end
end
end
*Michael Ryan*
* `:time` option added for `#touch`.
Fixes #18905.
*Hyonjee Joo*
* Add `foreign_key_exists?` method.
*Tõnis Simo*
* Use SQL COUNT and LIMIT 1 queries for `none?` and `one?` methods
if no block or limit is given, instead of loading the entire
collection into memory. This applies to relations (e.g. `User.all`)
as well as associations (e.g. `account.users`)
# Before:
users.none?
# SELECT "users".* FROM "users"
users.one?
# SELECT "users".* FROM "users"
# After:
users.none?
# SELECT 1 AS one FROM "users" LIMIT 1
users.one?
# SELECT COUNT(*) FROM "users"
*Eugene Gilburg*
* Have `enum` perform type casting consistently with the rest of Active
Record, such as `where`.
*Sean Griffin*
* `scoping` no longer pollutes the current scope of sibling classes when using
STI.
Fixes #18806.
Example:
StiOne.none.scoping do
StiTwo.all
end
*Sean Griffin*
* `remove_reference` with `foreign_key: true` removes the foreign key before
removing the column. This fixes a bug where it was not possible to remove
the column on MySQL.
Fixes #18664.
*Yves Senn*
* `find_in_batches` now accepts an `:finish` parameter that complements the `:start`
parameter to specify where to stop batch processing.
*Vipul A M*
* Fix a rounding problem for PostgreSQL timestamp columns.
If a timestamp column has a precision specified, it needs to
format according to that.
*Ryuta Kamizono*
* Respect the database default charset for `schema_migrations` table.
The charset of `version` column in `schema_migrations` table depends
on the database default charset and collation rather than the encoding
of the connection.
*Ryuta Kamizono*
* Raise `ArgumentError` when passing `nil` or `false` to `Relation#merge`.
These are not valid values to merge in a relation, so it should warn users
early.
*Rafael Mendonça França*
* Use `SCHEMA` instead of `DB_STRUCTURE` for specifying a structure file.
This makes the `db:structure` tasks consistent with `test:load_structure`.
*Dieter Komendera*
* Respect custom primary keys for associations when calling `Relation#where`
Fixes #18813.
*Sean Griffin*
* Fix several edge cases which could result in a counter cache updating
twice or not updating at all for `has_many` and `has_many :through`.
Fixes #10865.
*Sean Griffin*
* Foreign keys added by migrations were given random, generated names. This
meant a different `structure.sql` would be generated every time a developer
ran migrations on their machine.
The generated part of foreign key names is now a hash of the table name and
column name, which is consistent every time you run the migration.
*Chris Sinjakli*
* Fix n+1 query problem when eager loading nil associations (fixes #18312)
*Sammy Larbi*
* Change the default error message from `can't be blank` to `must exist` for
the presence validator of the `:required` option on `belongs_to`/`has_one`
associations.
*Henrik Nygren*
* Fixed `ActiveRecord::Relation#group` method when an argument is an SQL
reserved keyword:
Example:
SplitTest.group(:key).count
Property.group(:value).count
*Bogdan Gusiev*
* Added the `#or` method on `ActiveRecord::Relation`, allowing use of the OR
operator to combine WHERE or HAVING clauses.
Example:
Post.where('id = 1').or(Post.where('id = 2'))
# => SELECT * FROM posts WHERE (id = 1) OR (id = 2)
*Sean Griffin*, *Matthew Draper*, *Gael Muller*, *Olivier El Mekki*
* Don't define autosave association callbacks twice from
`accepts_nested_attributes_for`.
Fixes #18704.
*Sean Griffin*
* Integer types will no longer raise a `RangeError` when assigning an
attribute, but will instead raise when going to the database.
Fixes several vague issues which were never reported directly. See the
commit message from the commit which added this line for some examples.
*Sean Griffin*
* Values which would error while being sent to the database (such as an
ASCII-8BIT string with invalid UTF-8 bytes on SQLite3), no longer error on
assignment. They will still error when sent to the database, but you are
given the ability to re-assign it to a valid value.
Fixes #18580.
*Sean Griffin*
* Don't remove join dependencies in `Relation#exists?`
Fixes #18632.
*Sean Griffin*
* Invalid values assigned to a JSON column are assumed to be `nil`.
Fixes #18629.
*Sean Griffin*
* Add `ActiveRecord::Base#accessed_fields`, which can be used to quickly
discover which fields were read from a model when you are looking to only
select the data you need from the database.
*Sean Griffin*
* Introduce the `:if_exists` option for `drop_table`.
Example:
drop_table(:posts, if_exists: true)
That would execute:
DROP TABLE IF EXISTS posts
If the table doesn't exist, `if_exists: false` (the default) raises an
exception whereas `if_exists: true` does nothing.
*Cody Cutrer*, *Stefan Kanev*, *Ryuta Kamizono*
* Don't run SQL if attribute value is not changed for update_attribute method.
*Prathamesh Sonpatki*
* `time` columns can now get affected by `time_zone_aware_attributes`. If you have
set `config.time_zone` to a value other than `'UTC'`, they will be treated
as in that time zone by default in Rails 5.1. If this is not the desired
behavior, you can set
ActiveRecord::Base.time_zone_aware_types = [:datetime]
A deprecation warning will be emitted if you have a `:time` column, and have
not explicitly opted out.
Fixes #3145.
*Sean Griffin*
* Tests now run after_commit callbacks. You no longer have to declare
`uses_transaction ‘test name’` to test the results of an after_commit.
after_commit callbacks run after committing a transaction whose parent
is not `joinable?`: un-nested transactions, transactions within test cases,
and transactions in `console --sandbox`.
*arthurnn*, *Ravil Bayramgalin*, *Matthew Draper*
* `nil` as a value for a binary column in a query no longer logs as
"<NULL binary data>", and instead logs as just "nil".
*Sean Griffin*
* `attribute_will_change!` will no longer cause non-persistable attributes to
be sent to the database.
Fixes #18407.
*Sean Griffin*
* Remove support for the `protected_attributes` gem.
*Carlos Antonio da Silva*, *Roberto Miranda*
* Fix accessing of fixtures having non-string labels like Fixnum.
*Prathamesh Sonpatki*
* Remove deprecated support to preload instance-dependent associations.
*Yves Senn*
* Remove deprecated support for PostgreSQL ranges with exclusive lower bounds.
*Yves Senn*
* Remove deprecation when modifying a relation with cached Arel.
This raises an `ImmutableRelation` error instead.
*Yves Senn*
* Added `ActiveRecord::SecureToken` in order to encapsulate generation of
unique tokens for attributes in a model using `SecureRandom`.
*Roberto Miranda*
* Change the behavior of boolean columns to be closer to Ruby's semantics.
Before this change we had a small set of "truthy", and all others are "falsy".
Now, we have a small set of "falsy" values and all others are "truthy" matching
Ruby's semantics.
*Rafael Mendonça França*
* Deprecate `ActiveRecord::Base.errors_in_transactional_callbacks=`.
*Rafael Mendonça França*
* Change transaction callbacks to not swallow errors.
Before this change any errors raised inside a transaction callback
were getting rescued and printed in the logs.
Now these errors are not rescued anymore and just bubble up, as the other callbacks.
*Rafael Mendonça França*
* Remove deprecated `sanitize_sql_hash_for_conditions`.
*Rafael Mendonça França*
* Remove deprecated `Reflection#source_macro`.
*Rafael Mendonça França*
* Remove deprecated `symbolized_base_class` and `symbolized_sti_name`.
*Rafael Mendonça França*
* Remove deprecated `ActiveRecord::Base.disable_implicit_join_references=`.
*Rafael Mendonça França*
* Remove deprecated access to connection specification using a string accessor.
Now all strings will be handled as a URL.
*Rafael Mendonça França*
* Change the default `null` value for `timestamps` to `false`.
*Rafael Mendonça França*
* Return an array of pools from `connection_pools`.
*Rafael Mendonça França*
* Return a null column from `column_for_attribute` when no column exists.
*Rafael Mendonça França*
* Remove deprecated `serialized_attributes`.
*Rafael Mendonça França*
* Remove deprecated automatic counter caches on `has_many :through`.
*Rafael Mendonça França*
* Change the way in which callback chains can be halted.
The preferred method to halt a callback chain from now on is to explicitly
`throw(:abort)`.
In the past, returning `false` in an Active Record `before_` callback had the
side effect of halting the callback chain.
This is not recommended anymore and, depending on the value of the
`ActiveSupport.halt_callback_chains_on_return_false` option, will
either not work at all or display a deprecation warning.
*claudiob*
* Clear query cache on rollback.
*Florian Weingarten*
* Fix setting of foreign_key for through associations when building a new record.
Fixes #12698.
*Ivan Antropov*
* Improve dumping of the primary key. If it is not a default primary key,
correctly dump the type and options.
Fixes #14169, #16599.
*Ryuta Kamizono*
* Format the datetime string according to the precision of the datetime field.
Incompatible to rounding behavior between MySQL 5.6 and earlier.
In 5.5, when you insert `2014-08-17 12:30:00.999999` the fractional part
is ignored. In 5.6, it's rounded to `2014-08-17 12:30:01`:
http://bugs.mysql.com/bug.php?id=68760
*Ryuta Kamizono*
* Allow a precision option for MySQL datetimes.
*Ryuta Kamizono*
* Fixed automatic `inverse_of` for models nested in a module.
*Andrew McCloud*
* Change `ActiveRecord::Relation#update` behavior so that it can
be called without passing ids of the records to be updated.
This change allows updating multiple records returned by
`ActiveRecord::Relation` with callbacks and validations.
# Before
# ArgumentError: wrong number of arguments (1 for 2)
Comment.where(group: 'expert').update(body: "Group of Rails Experts")
# After
# Comments with group expert updated with body "Group of Rails Experts"
Comment.where(group: 'expert').update(body: "Group of Rails Experts")
*Prathamesh Sonpatki*
* Fix `reaping_frequency` option when the value is a string.
This usually happens when it is configured using `DATABASE_URL`.
*korbin*
* Fix error message when trying to create an associated record and the foreign
key is missing.
Before this fix the following exception was being raised:
NoMethodError: undefined method `val' for #<Arel::Nodes::BindParam:0x007fc64d19c218>
Now the message is:
ActiveRecord::UnknownAttributeError: unknown attribute 'foreign_key' for Model.
*Rafael Mendonça França*
* Fix change detection problem for PostgreSQL bytea type and
`ArgumentError: string contains null byte` exception with pg-0.18.
Fixes #17680.
*Lars Kanis*
* When a table has a composite primary key, the `primary_key` method for
SQLite3 and PostgreSQL adapters was only returning the first field of the key.
Ensures that it will return nil instead, as Active Record doesn't support
composite primary keys.
Fixes #18070.
*arthurnn*
* `validates_size_of` / `validates_length_of` do not count records
which are `marked_for_destruction?`.
Fixes #7247.
*Yves Senn*
* Ensure `first!` and friends work on loaded associations.
Fixes #18237.
*Sean Griffin*
* `eager_load` preserves readonly flag for associations.
Fixes #15853.
*Takashi Kokubun*
* Provide `:touch` option to `save()` to accommodate saving without updating
timestamps.
Fixes #18202.
*Dan Olson*
* Provide a more helpful error message when an unsupported class is passed to
`serialize`.
Fixes #18224.
*Sean Griffin*
* Add bigint primary key support for MySQL.
Example:
create_table :foos, id: :bigint do |t|
end
*Ryuta Kamizono*
* Support for any type of primary key.
Fixes #14194.
*Ryuta Kamizono*
* Dump the default `nil` for PostgreSQL UUID primary key.
*Ryuta Kamizono*
* Add a `:foreign_key` option to `references` and associated migration
methods. The model and migration generators now use this option, rather than
the `add_foreign_key` form.
*Sean Griffin*
* Don't raise when writing an attribute with an out-of-range datetime passed
by the user.
*Grey Baker*
* Replace deprecated `ActiveRecord::Tasks::DatabaseTasks#load_schema` with
`ActiveRecord::Tasks::DatabaseTasks#load_schema_for`.
*Yves Senn*
* Fix bug with `ActiveRecord::Type::Numeric` that caused negative values to
be marked as having changed when set to the same negative value.
Fixes #18161.
*Daniel Fox*
* Introduce `force: :cascade` option for `create_table`. Using this option
will recreate tables even if they have dependent objects (like foreign keys).
`db/schema.rb` now uses `force: :cascade`. This makes it possible to
reload the schema when foreign keys are in place.
*Matthew Draper*, *Yves Senn*
* `db:schema:load` and `db:structure:load` no longer purge the database
before loading the schema. This is left for the user to do.
`db:test:prepare` will still purge the database.
Fixes #17945.
*Yves Senn*
* Fix undesirable RangeError by `Type::Integer`. Add `Type::UnsignedInteger`.
*Ryuta Kamizono*
* Add `foreign_type` option to `has_one` and `has_many` association macros.
This option enables to define the column name of associated object's type for polymorphic associations.
*Ulisses Almeida*, *Kassio Borges*
* Remove deprecated behavior allowing nested arrays to be passed as query
values.
*Melanie Gilman*
* Deprecate passing a class as a value in a query. Users should pass strings
instead.
*Melanie Gilman*
* `add_timestamps` and `remove_timestamps` now properly reversible with
options.
*Noam Gagliardi-Rabinovich*
* `ActiveRecord::ConnectionAdapters::ColumnDumper#column_spec` and
`ActiveRecord::ConnectionAdapters::ColumnDumper#prepare_column_options` no
longer have a `types` argument. They should access
`connection#native_database_types` directly.
*Yves Senn*
Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/activerecord/CHANGELOG.md) for previous changes.
