rails--rails/activerecord/CHANGELOG.md

• Add FinderMethods#sole and #find_sole_by to find and assert the presence of exactly one record.

  Used when you need a single row, but also want to assert that there aren't multiple rows matching the condition; especially for when database constraints aren't enough or are impractical.

  Product.where(["price = %?", price]).sole
  # => ActiveRecord::RecordNotFound      (if no Product with given price)
  # => #<Product ...>                    (if one Product with given price)
  # => ActiveRecord::SoleRecordExceeded  (if more than one Product with given price)
  
  user.api_keys.find_sole_by(key: key)
  # as above
  

  Asherah Connor

• Makes ActiveRecord::AttributeMethods::Query respect the getter overrides defined in the model.

  Before:

  class User
    def admin
      false # Overriding the getter to always return false
    end
  end
  
  user = User.first
  user.update(admin: true)
  
  user.admin # false (as expected, due to the getter overwrite)
  user.admin? # true (not expected, returned the DB column value)
  

  After this commit, user.admin? above returns false, as expected.

  Fixes #40771.

  Felipe

• Allow delegated_type to be specified primary_key and foreign_key.

  Since delegated_type assumes that the foreign_key ends with _id, singular_id defined by it does not work when the foreign_key does not end with id. This change fixes it by taking into account primary_key and foreign_key in the options.

  Ryota Egusa

• Expose an invert_where method that will invert all scope conditions.

  class User
    scope :active, -> { where(accepted: true, locked: false) }
  end
  
  User.active
  # ... WHERE `accepted` = 1 AND `locked` = 0
  
  User.active.invert_where
  # ... WHERE NOT (`accepted` = 1 AND `locked` = 0)
  

  Kevin Deisz

• Restore possibility of passing false to :polymorphic option of belongs_to.

  Previously, passing false would trigger the option validation logic to throw an error saying :polymorphic would not be a valid option.

  glaszig

• Remove deprecated database kwarg from connected_to.

  Eileen M. Uchitelle, John Crepezzi

• Allow adding nonnamed expression indexes to be revertible.

  Fixes #40732.

  Previously, the following code would raise an error, when executed while rolling back, and the index name should be specified explicitly. Now, the index name is inferred automatically.

  add_index(:items, "to_tsvector('english', description)")
  

  fatkodima

• Only warn about negative enums if a positive form that would cause conflicts exists.

  Fixes #39065.

  Alex Ghiculescu

• Add option to run default_scope on all queries.

  Previously, a default_scope would only run on select or insert queries. In some cases, like non-Rails tenant sharding solutions, it may be desirable to run default_scope on all queries in order to ensure queries are including a foreign key for the shard (ie blog_id).

  Now applications can add an option to run on all queries including select, insert, delete, and update by adding an all_queries option to the default scope definition.

  class Article < ApplicationRecord
    default_scope -> { where(blog_id: Current.blog.id) }, all_queries: true
  end
  

  Eileen M. Uchitelle

• Add where.associated to check for the presence of an association.

  # Before:
  account.users.joins(:contact).where.not(contact_id: nil)
  
  # After:
  account.users.where.associated(:contact)
  

  Also mirrors where.missing.

  Kasper Timm Hansen

• Allow constructors (build_association and create_association) on has_one :through associations.

  Santiago Perez Perret

Please check 6-1-stable for previous changes.