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  • find_each now returns an Enumerator when called without a block, so that it can be chained with other Enumerable methods.

    Ben Woosley

  • Fixture setup does no longer depend on ActiveRecord::Base.configurations. This is relevant when ENV["DATABASE_URL"] is used in place of a database.yml.

    Yves Senn

  • Fix mysql2 adapter raises the correct exception when executing a query on a closed connection.

    Yves Senn

  • Ambiguous reflections are on :through relationships are no longer supported. For example, you need to change this:

    class Author < ActiveRecord::Base has_many :posts has_many :taggings, :through => :posts end

    class Post < ActiveRecord::Base has_one :tagging has_many :taggings end

    class Tagging < ActiveRecord::Base end

    To this:

    class Author < ActiveRecord::Base has_many :posts has_many :taggings, :through => :posts, :source => :tagging end

    class Post < ActiveRecord::Base has_one :tagging has_many :taggings end

    class Tagging < ActiveRecord::Base end

  • Remove column restrictions for count, let the database raise if the SQL is invalid. The previous behavior was untested and surprising for the user. Fixes #5554.

    Example:"name, username").count
    # Before => SELECT count(*) FROM users
    # After => ActiveRecord::StatementInvalid
    # you can still use `count(:all)` to perform a query unrelated to the
    # selected columns"name, username").count(:all) # => SELECT count(*) FROM users

    Yves Senn

  • 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 usereadonlymethod explicitly to mark records asreadonly. Fixes #10615.


    user = User.joins(:todos).select("users.*, todos.title as todos_title").readonly(true).first
    user.todos_title = 'clean pet'! # will raise error

    Yves Senn

  • Fix the :primary_key option for has_many associations. Fixes #10693.

    Yves Senn

  • Fix bug where tiny types are incorrectly coerced as boolean 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.


  • 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]

    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)
    member =
    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

    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.


  • rake:db:test:prepare falls back to original environment after execution.

    Slava Markevich

Please check 4-0-stable for previous changes.

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