rails--rails/activerecord/CHANGELOG.md

• Omit redundant using: :btree for schema dumping.

  Ryuta Kamizono

• Deprecate passing default to index_name_exists?.

  Ryuta Kamizono

• PostgreSQL: schema dumping support for interval and OID columns.

  Ryuta Kamizono

• Deprecate supports_primary_key? on connection adapters since it's been long unused and unsupported.

  Ryuta Kamizono

• Make table_name= reset current statement cache, so queries are not run against the previous table name.

  namusyaka

• Allow ActiveRecord::Base#as_json to be passed a frozen Hash.

  Isaac Betesh

• Fix inspection behavior when the :id column is not primary key.

  namusyaka

• Deprecate locking records with unpersisted changes.

  Marc Schütz

• Remove deprecated behavior that halts callbacks when the return is false.

  Rafael Mendonça França

• Deprecate ColumnDumper#migration_keys.

  Ryuta Kamizono

• Fix association_primary_key_type for reflections with symbol primary key.

  Fixes #27864.

  Daniel Colson

• Virtual/generated column support for MySQL 5.7.5+ and MariaDB 5.2.0+.

  MySQL generated columns: https://dev.mysql.com/doc/refman/5.7/en/create-table-generated-columns.html MariaDB virtual columns: https://mariadb.com/kb/en/mariadb/virtual-computed-columns/

  Declare virtual columns with t.virtual name, type: …, as: "expression". Pass stored: true to persist the generated value (false by default).

  Example:

  create_table :generated_columns do |t|
    t.string  :name
    t.virtual :upper_name,  type: :string,  as: "UPPER(name)"
    t.virtual :name_length, type: :integer, as: "LENGTH(name)", stored: true
    t.index :name_length  # May be indexed, too!
  end
  

  Ryuta Kamizono

• Deprecate initialize_schema_migrations_table and initialize_internal_metadata_table.

  Ryuta Kamizono

• Support foreign key creation for SQLite3.

  Ryuta Kamizono

• Place generated migrations into the path set by config.paths["db/migrate"].

  Kevin Glowacz

• Raise ActiveRecord::InvalidForeignKey when a foreign key constraint fails on SQLite3.

  Ryuta Kamizono

• Add the touch option to ActiveRecord#increment! and decrement!.

  Hiroaki Izu

• Deprecate passing a class to the class_name because it eagerloads more classes than necessary and potentially creates circular dependencies.

  Kir Shatrov

• Raise error when has_many through is defined before through association.

  Fixes #26834.

  Chris Holmes

• Deprecate passing name to indexes.

  Ryuta Kamizono

• Remove deprecated tasks: db:test:clone, db:test:clone_schema, db:test:clone_structure.

  Rafel Mendonça França

• Compare deserialized values for PostgreSQL::OID::Hstore types when calling ActiveRecord::Dirty#changed_in_place?.

  Fixes #27502.

  Jon Moss

• Raise ArgumentError when passing an ActiveRecord::Base instance to .find, .exists? and .update.

  Rafael Mendonça França

• Respect precision option for arrays of timestamps.

  Fixes #27514.

  Sean Griffin

• Optimize slow model instantiation when using STI and store_full_sti_class = false option.

  Konstantin Lazarev

• Add touch option to counter cache modifying methods.

  Works when updating, resetting, incrementing and decrementing counters:

  # Touches `updated_at`/`updated_on`.
  Topic.increment_counter(:messages_count, 1, touch: true)
  Topic.decrement_counter(:messages_count, 1, touch: true)
  
  # Touches `last_discussed_at`.
  Topic.reset_counters(18, :messages, touch: :last_discussed_at)
  
  # Touches `updated_at` and `last_discussed_at`.
  Topic.update_counters(18, messages_count: 5, touch: %i( updated_at last_discussed_at ))
  

  Fixes #26724.

  Jarred Trost

• Remove deprecated #uniq, #uniq!, and #uniq_value.

  Ryuta Kamizono

• Remove deprecated #insert_sql, #update_sql, and #delete_sql.

  Ryuta Kamizono

• Remove deprecated #use_transactional_fixtures configuration.

  Rafael Mendonça França

• Remove deprecated #raise_in_transactional_callbacks configuration.

  Rafael Mendonça França

• Remove deprecated #load_schema_for.

  Rafael Mendonça França

• Remove deprecated conditions parameter from #destroy_all and #delete_all.

  Rafael Mendonça França

• Remove deprecated support to passing arguments to #select when a block is provided.

  Rafael Mendonça França

• Remove deprecated support to query using commas on LIMIT.

  Rafael Mendonça França

• Remove deprecated support to passing a class as a value in a query.

  Rafael Mendonça França

• Raise ActiveRecord::IrreversibleOrderError when using last with an irreversible order.

  Rafael Mendonça França

• Raise when a has_many :through association has an ambiguous reflection name.

  Rafael Mendonça França

• Raise when ActiveRecord::Migration is inherited from directly.

  Rafael Mendonça França

• Remove deprecated original_exception argument in ActiveRecord::StatementInvalid#initialize and ActiveRecord::StatementInvalid#original_exception.

  Rafael Mendonça França

• #tables and #table_exists? return only tables and not views.

  All the deprecations on those methods were removed.

  Rafael Mendonça França

• Remove deprecated name argument from #tables.

  Rafael Mendonça França

• Remove deprecated support to passing a column to #quote.

  Rafael Mendonça França

• Set :time as a timezone aware type and remove deprecation when config.active_record.time_zone_aware_types is not explicitly set.

  Rafael Mendonça França

• Remove deprecated force reload argument in singular and collection association readers.

  Rafael Mendonça França

• Remove deprecated activerecord.errors.messages.restrict_dependent_destroy.one and activerecord.errors.messages.restrict_dependent_destroy.many i18n scopes.

  Rafael Mendonça França

• Allow passing extra flags to db:structure:load and db:structure:dump

  Introduces ActiveRecord::Tasks::DatabaseTasks.structure_(load|dump)_flags to customize the eventual commands run against the database, e.g. mysqldump/pg_dump.

  Kir Shatrov

• Notifications see frozen SQL string.

  Fixes #23774.

  Richard Monette

• RuntimeErrors are no longer translated to ActiveRecord::StatementInvalid.

  Richard Monette

• Change the schema cache format to use YAML instead of Marshal.

  Kir Shatrov

• Support index length and order options using both string and symbol column names.

  Fixes #27243.

  Ryuta Kamizono

• Raise ActiveRecord::RangeError when values that executed are out of range.

  Ryuta Kamizono

• Raise ActiveRecord::NotNullViolation when a record cannot be inserted or updated because it would violate a not null constraint.

  Ryuta Kamizono

• Emulate db trigger behaviour for after_commit :destroy, :update.

  Race conditions can occur when an ActiveRecord is destroyed twice or destroyed and updated. The callbacks should only be triggered once, similar to a SQL database trigger.

  Stefan Budeanu

• Moved DecimalWithoutScale, Text, and UnsignedInteger from Active Model to Active Record.

  Iain Beeston

• Fix write_attribute method to check whether an attribute is aliased or not, and use the aliased attribute name if needed.

  Prathamesh Sonpatki

• Fix read_attribute method to check whether an attribute is aliased or not, and use the aliased attribute name if needed.

  Fixes #26417.

  Prathamesh Sonpatki

• PostgreSQL & MySQL: Use big integer as primary key type for new tables.

  Jon McCartie, Pavel Pravosud

• Change the type argument of ActiveRecord::Base#attribute to be optional. The default is now ActiveRecord::Type::Value.new, which provides no type casting behavior.

  Sean Griffin

• Don't treat unsigned integers with zerofill as signed.

  Fixes #27125.

  Ryuta Kamizono

• Fix the uniqueness validation scope with a polymorphic association.

  Sergey Alekseev

• Raise ActiveRecord::RecordNotFound from collection *_ids setters for unknown IDs with a better error message.

  Changes the collection *_ids setters to cast provided IDs the data type of the primary key set in the association, not the model primary key.

  Dominic Cleal

• For PostgreSQL >= 9.4 use pgcrypto's gen_random_uuid() instead of uuid-ossp's UUID generation function.

  Yuji Yaginuma, Yaw Boakye

• Introduce Model#reload_<association> to bring back the behavior of Article.category(true) where category is a singular association.

  The force reloading of the association reader was deprecated in #20888. Unfortunately the suggested alternative of article.reload.category does not expose the same behavior.

  This patch adds a reader method with the prefix reload_ for singular associations. This method has the same semantics as passing true to the association reader used to have.

  Yves Senn

• Make sure eager loading ActiveRecord::Associations also loads constants defined in ActiveRecord::Associations::Preloader.

  Yves Senn

• Allow ActionController::Parameters-like objects to be passed as values for Postgres HStore columns.

  Fixes #26904.

  Jon Moss

• Added stat method to ActiveRecord::ConnectionAdapters::ConnectionPool.

  Example:

  ActiveRecord::Base.connection_pool.stat # =>
  { size: 15, connections: 1, busy: 1, dead: 0, idle: 0, waiting: 0, checkout_timeout: 5 }
  

  Pavel Evstigneev

• Avoid unscope(:order) when limit_value is presented for count and exists?.

  If limit_value is presented, records fetching order is very important for performance. We should not unscope the order in the case.

  Ryuta Kamizono

• Fix an Active Record DateTime field NoMethodError caused by incomplete datetime.

  Fixes #24195.

  Sen Zhang

• Allow slice to take an array of methods(without the need for splatting).

  Cohen Carlisle

• Improved partial writes with HABTM and has many through associations to fire database query only if relation has been changed.

  Fixes #19663.

  Mehmet Emin İNAÇ

• Deprecate passing arguments and block at the same time to ActiveRecord::QueryMethods#select.

  Prathamesh Sonpatki

• Optimistic locking: Added ability to update locking_column value. Ignore optimistic locking if trying to update with new locking_column value.

  bogdanvlviv

• Fixed: Optimistic locking does not work well with null in the database.

  Fixes #26024.

  bogdanvlviv

• Fixed support for case insensitive comparisons of text columns in PostgreSQL.

  Edho Arief

• Serialize JSON attribute value nil as SQL NULL, not JSON null.

  Trung Duc Tran

• Return true from update_attribute when the value of the attribute to be updated is unchanged.

  Fixes #26593.

  Prathamesh Sonpatki

• Always store errors details information with symbols.

  When the association is autosaved we were storing the details with string keys. This was creating inconsistency with other details that are added using the Errors#add method. It was also inconsistent with the Errors#messages storage.

  To fix this inconsistency we are always storing with symbols. This will cause a small breaking change because in those cases the details could be accessed as strings keys but now it can not.

  Fix #26499.

  Rafael Mendonça França, Marcus Vieira

• Calling touch on a model using optimistic locking will now leave the model in a non-dirty state with no attribute changes.

  Fixes #26496.

  Jakob Skjerning

• Using a mysql2 connection after it fails to reconnect will now have an error message saying the connection is closed rather than an undefined method error message.

  Dylan Thacker-Smith

• PostgreSQL array columns will now respect the encoding of strings contained in the array.

  Fixes #26326.

  Sean Griffin

• Inverse association instances will now be set before after_find or after_initialize callbacks are run.

  Fixes #26320.

  Sean Griffin

• Remove unnecessarily association load when a belongs_to association has already been loaded then the foreign key is changed directly and the record saved.

  James Coleman

• Remove standardized column types/arguments spaces in schema dump.

  Tim Petricola

• Avoid loading records from database when they are already loaded using the pluck method on a collection.

  Fixes #25921.

  Ryuta Kamizono

• Remove text default treated as an empty string in non-strict mode for consistency with other types.

  Strict mode controls how MySQL handles invalid or missing values in data-change statements such as INSERT or UPDATE. If strict mode is not in effect, MySQL inserts adjusted values for invalid or missing values and produces warnings.

  def test_mysql_not_null_defaults_non_strict
    using_strict(false) do
      with_mysql_not_null_table do |klass|
        record = klass.new
        assert_nil record.non_null_integer
        assert_nil record.non_null_string
        assert_nil record.non_null_text
        assert_nil record.non_null_blob
  
        record.save!
        record.reload
  
        assert_equal 0,  record.non_null_integer
        assert_equal "", record.non_null_string
        assert_equal "", record.non_null_text
        assert_equal "", record.non_null_blob
      end
    end
  end
  

  https://dev.mysql.com/doc/refman/5.7/en/sql-mode.html#sql-mode-strict

  Ryuta Kamizono

• SQLite3 migrations to add a column to an existing table can now be successfully rolled back when the column was given and invalid column type.

  Fixes #26087.

  Travis O'Neill

• Deprecate sanitize_conditions. Use sanitize_sql instead.

  Ryuta Kamizono

• Doing count on relations that contain LEFT OUTER JOIN Arel node no longer force a DISTINCT. This solves issues when using count after a left_joins.

  Maxime Handfield Lapointe

• RecordNotFound raised by association.find exposes id, primary_key and model methods to be consistent with RecordNotFound raised by Record.find.

  Michel Pigassou

• Hashes can once again be passed to setters of composed_of, if all of the mapping methods are methods implemented on Hash.

  Fixes #25978.

  Sean Griffin

• Fix the SELECT statement in #table_comment for MySQL.

  Takeshi Akima

• Virtual attributes will no longer raise when read on models loaded from the database.

  Sean Griffin

• Support calling the method merge in scope's lambda.

  Yasuhiro Sugino

• Fixes multi-parameter attributes conversion with invalid params.

  Hiroyuki Ishii

• Add newline between each migration in structure.sql.

  Keeps schema migration inserts as a single commit, but allows for easier git diffing.

  Fixes #25504.

  Grey Baker, Norberto Lopes

• The flag error_on_ignored_order_or_limit has been deprecated in favor of the current error_on_ignored_order.

  Xavier Noria

• Batch processing methods support limit:

  Post.limit(10_000).find_each do |post|
    # ...
  end
  

  It also works in find_in_batches and in_batches.

  Xavier Noria

• Using group with an attribute that has a custom type will properly cast the hash keys after calling a calculation method like count.

  Fixes #25595.

  Sean Griffin

• Fix the generated #to_param method to use omission: '' so that the resulting output is actually up to 20 characters, not effectively 17 to leave room for the default "...". Also call #parameterize before #truncate and make the separator: /-/ to maximize the information included in the output.

  Fixes #23635.

  Rob Biedenharn

• Ensure concurrent invocations of the connection reaper cannot allocate the same connection to two threads.

  Fixes #25585.

  Matthew Draper

• Inspecting an object with an associated array of over 10 elements no longer truncates the array, preventing inspect from looping infinitely in some cases.

  Kevin McPhillips

• Removed the unused methods ActiveRecord::Base.connection_id and ActiveRecord::Base.connection_id=.

  Sean Griffin

• Ensure hashes can be assigned to attributes created using composed_of.

  Fixes #25210.

  Sean Griffin

• Fix logging edge case where if an attribute was of the binary type and was provided as a Hash.

  Jon Moss

• Handle JSON deserialization correctly if the column default from database adapter returns '' instead of nil.

  Johannes Opper

• Introduce ActiveRecord::TransactionSerializationError for catching transaction serialization failures or deadlocks.

  Erol Fornoles

• PostgreSQL: Fix db:structure:load silent failure on SQL error.

  The command line flag -v ON_ERROR_STOP=1 should be used when invoking psql to make sure errors are not suppressed.

  Example:

  psql -v ON_ERROR_STOP=1 -q -f awesome-file.sql my-app-db
  

  Fixes #23818.

  Ralin Chimev

Please check 5-0-stable for previous changes.