rails/activerecord/CHANGELOG.md

• Log nil binary column values correctly.

  When an object with a binary column is updated with a nil value in that column, the SQL logger would throw an exception when trying to log that nil value. This only occurs when updating a record that already has a non-nil value in that column since an initial nil value isn't included in the SQL anyway (at least, when dirty checking is enabled.) The column's new value will now be logged as <NULL binary data> to parallel the existing <N bytes of binary data> for non-nil values.

  James Coleman

• Stringify all variable keys of mysql connection configuration.

  When the sql_mode variable for mysql adapters is set in the configuration as a String, it was ignored and overwritten by the strict mode option.

  Fixes #14895.

  Paul Nikitochkin

• Ensure SQLite3 statements are closed on errors.

  Fixes #13631.

  Timur Alperovich

• Give ActiveRecord::PredicateBuilder private methods the privacy they deserve.

  Hector Satre

• When using a custom join_table name on a habtm, rails was not saving it on Reflections. This causes a problem when rails loads fixtures, because it uses the reflections to set database with fixtures.

  Fixes #14845.

  Kassio Borges

• Reset the cache when modifying a Relation with cached Arel. Additionally display a warning message to make the user aware.

  Yves Senn

• PostgreSQL should internally use :datetime consistently for TimeStamp. Assures different spellings of timestamps are treated the same.

  Example:

  mytimestamp.simplified_type('timestamp without time zone')
  # => :datetime
  mytimestamp.simplified_type('timestamp(6) without time zone')
  # => also :datetime (previously would be :timestamp)
  

  See #14513.

  Jefferson Lai

• ActiveRecord::Base.no_touching no longer triggers callbacks or start empty transactions.

  Fixes #14841.

  Lucas Mazza

• Fix name collision with Array#select! with Relation#select!.

  Fixes #14752.

  Earl St Sauver

• Fixed unexpected behavior for has_many :through associations going through a scoped has_many.

  If a has_many association is adjusted using a scope, and another has_many :through uses this association, then the scope adjustment is unexpectedly neglected.

  Fixes #14537.

  Jan Habermann

• @destroyed should always be set to false when an object is duped.

  Kuldeep Aggarwal

• Fixed has_many association to make it support irregular inflections.

  Fixes #8928.

  arthurnn, Javier Goizueta

• Fixed a problem where count used with a grouping was not returning a Hash.

  Fixes #14721.

  Eric Chahin

• sanitize_sql_like helper method to escape a string for safe use in a SQL LIKE statement.

  Example:

  class Article
    def self.search(term)
      where("title LIKE ?", sanitize_sql_like(term))
    end
  end
  
  Article.search("20% _reduction_")
  # => Query looks like "... title LIKE '20\% \_reduction\_' ..."
  

  Rob Gilson, Yves Senn

• Do not quote uuid default value on change_column.

  Fixes #14604.

  Eric Chahin

• The comparison between Relation and CollectionProxy should be consistent.

  Example:

  author.posts == Post.where(author_id: author.id)
  # => true
  Post.where(author_id: author.id) == author.posts
  # => true
  

  Fixes #13506.

  Lauro Caetano

• Calling delete_all on an unloaded CollectionProxy no longer generates a SQL statement containing each id of the collection:

  Before:

  DELETE FROM `model` WHERE `model`.`parent_id` = 1
  AND `model`.`id` IN (1, 2, 3...)
  

  After:

  DELETE FROM `model` WHERE `model`.`parent_id` = 1
  

  Eileen M. Uchitelle, Aaron Patterson

• Fixed error for aggregate methods (empty?, any?, count) with select which created invalid SQL.

  Fixes #13648.

  Simon Woker

• PostgreSQL adapter only warns once for every missing OID per connection.

  Fixes #14275.

  Matthew Draper, Yves Senn

• PostgreSQL adapter automatically reloads it's type map when encountering unknown OIDs.

  Fixes #14678.

  Matthew Draper, Yves Senn

• Fix insertion of records via has_many :through association with scope.

  Fixes #3548.

  Ivan Antropov

• Auto-generate stable fixture UUIDs on PostgreSQL.

  Fixes: #11524

  Roderick van Domburg

• Fixed a problem where an enum would overwrite values of another enum with the same name in an unrelated class.

  Fixes #14607.

  Evan Whalen

• PostgreSQL and SQLite string columns no longer have a default limit of 255.

  Fixes #13435, #9153.

  Vladimir Sazhin, Toms Mikoss, Yves Senn

• Make possible to have an association called records.

  Fixes #11645.

  prathamesh-sonpatki

• to_sql on an association now matches the query that is actually executed, where it could previously have incorrectly accrued additional conditions (e.g. as a result of a previous query). CollectionProxy now always defers to the association scope's arel method so the (incorrect) inherited one should be entirely concealed.

  Fixes #14003.

  Jefferson Lai

• Block a few default Class methods as scope name.

  For instance, this will raise:

  scope :public, -> { where(status: 1) }
  

  arthurnn

• Fixed error when using with_options with lambda.

  Fixes #9805.

  Lauro Caetano

• Switch sqlite3:/// URLs (which were temporarily deprecated in 4.1) from relative to absolute.

  If you still want the previous interpretation, you should replace sqlite3:///my/path with sqlite3:my/path.

  Matthew Draper

• Treat blank UUID values as nil.

  Example:

  Sample.new(uuid_field: '') #=> <Sample id: nil, uuid_field: nil>
  

  Dmitry Lavrov

• Enable support for materialized views on PostgreSQL >= 9.3.

  Dave Lee

• The PostgreSQL adapter supports custom domains. Fixes #14305.

  Yves Senn

• PostgreSQL Column#type is now determined through the corresponding OID. The column types stay the same except for enum columns. They no longer have nil as type but enum.

  See #7814.

  Yves Senn

• Fixed error when specifying a non-empty default value on a PostgreSQL array column.

  Fixes #10613.

  Luke Steensen

• Make possible to change record_timestamps inside Callbacks.

  Tieg Zaharia

• Fixed error where .persisted? throws SystemStackError for an unsaved model with a custom primary key that didn't save due to validation error.

  Fixes #14393.

  Chris Finne

• Introduce validate as an alias for valid?.

  This is more intuitive when you want to run validations but don't care about the return value.

  Henrik Nyh

• Create indexes inline in CREATE TABLE for MySQL.

  This is important, because adding an index on a temporary table after it has been created would commit the transaction.

  It also allows creating and dropping indexed tables with fewer queries and fewer permissions required.

  Example:

  create_table :temp, temporary: true, as: "SELECT id, name, zip FROM a_really_complicated_query" do |t|
    t.index :zip
  end
  # => CREATE TEMPORARY TABLE temp (INDEX (zip)) AS SELECT id, name, zip FROM a_really_complicated_query
  

  Cody Cutrer, Steve Rice, Rafael Mendonça Franca

• Save has_one association even if the record doesn't changed.

  Fixes #14407.

  Rafael Mendonça França

• Use singular table name in generated migrations when ActiveRecord::Base.pluralize_table_names is false.

  Fixes #13426.

  Kuldeep Aggarwal

• touch accepts many attributes to be touched at once.

  Example:

  # touches :signed_at, :sealed_at, and :updated_at/on attributes.
  Photo.last.touch(:signed_at, :sealed_at)
  

  James Pinto

• rake db:structure:dump only dumps schema information if the schema migration table exists.

  Fixes #14217.

  Yves Senn

• Reap connections that were checked out by now-dead threads, instead of waiting until they disconnect by themselves. Before this change, a suitably constructed series of short-lived threads could starve the connection pool, without ever having more than a couple alive at the same time.

  Matthew Draper

• pk_and_sequence_for now ensures that only the pg_depend entries pointing to pg_class, and thus only sequence objects, are considered.

  Josh Williams

• where.not adds references for includes like normal where calls do.

  Fixes #14406.

  Yves Senn

• Extend fixture $LABEL replacement to allow string interpolation.

  Example:

  martin:
    email: $LABEL@email.com
  
  users(:martin).email # => martin@email.com
  

  Eric Steele

• Add support for Relation be passed as parameter on QueryCache#select_all.

  Fixes #14361.

  arthurnn

• Passing an Active Record object to find is now deprecated. Call .id on the object first.

• Passing an Active Record object to find or exists? is now deprecated. Call .id on the object first.

• Only use BINARY for MySQL case sensitive uniqueness check when column has a case insensitive collation.

  Ryuta Kamizono

• Support for MySQL 5.6 fractional seconds.

  arthurnn, Tatsuhiko Miyagawa

• Support for Postgres citext data type enabling case-insensitive where values without needing to wrap in UPPER/LOWER sql functions.

  Troy Kruthoff, Lachlan Sylvester

• Allow strings to specify the #order value.

  Example:

  Model.order(id: 'asc').to_sql == Model.order(id: :asc).to_sql
  

  Marcelo Casiraghi, Robin Dupret

• Dynamically register PostgreSQL enum OIDs. This prevents "unknown OID" warnings on enum columns.

  Dieter Komendera

• includes is able to detect the right preloading strategy when string joins are involved.

  Fixes #14109.

  Aaron Patterson, Yves Senn

• Fixed error with validation with enum fields for records where the value for any enum attribute is always evaluated as 0 during uniqueness validation.

  Fixes #14172.

  Vilius Luneckas Ahmed AbouElhamayed

• before_add callbacks are fired before the record is saved on has_and_belongs_to_many assocations and on has_many :through associations. Before this change, before_add callbacks would be fired before the record was saved on has_and_belongs_to_many associations, but not on has_many :through associations.

  Fixes #14144.

• Fixed STI classes not defining an attribute method if there is a conflicting private method defined on its ancestors.

  Fixes #11569.

  Godfrey Chan

• Coerce strings when reading attributes. Fixes #10485.

  Example:

  book = Book.new(title: 12345)
  book.save!
  book.title # => "12345"
  

  Yves Senn

• Deprecate half-baked support for PostgreSQL range values with excluding beginnings. We currently map PostgreSQL ranges to Ruby ranges. This conversion is not fully possible because the Ruby range does not support excluded beginnings.

  The current solution of incrementing the beginning is not correct and is now deprecated. For subtypes where we don't know how to increment (e.g. #succ is not defined) it will raise an ArgumentException for ranges with excluding beginnings.

  Yves Senn

• Support for user created range types in PostgreSQL.

  Yves Senn

Please check 4-1-stable for previous changes.