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  • 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  • Do not quote uuid default value on change_column.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.

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