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  • 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)
      end
    end
    
    member = Member.new
    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
    end
    

    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.

    kennyj

  • 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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