diff options
Diffstat (limited to 'guides/source')
| -rw-r--r-- | guides/source/4_0_release_notes.textile | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/guides/source/4_0_release_notes.textile b/guides/source/4_0_release_notes.textile index e1d6b42e6c..8415f6f83a 100644 --- a/guides/source/4_0_release_notes.textile +++ b/guides/source/4_0_release_notes.textile @@ -329,6 +329,20 @@ Moved into a separate gem <tt>sprockets-rails</tt>. h3. Active Record +* Add <tt>add_reference</tt> and <tt>remove_reference</tt> schema statements. Aliases, <tt>add_belongs_to</tt> and <tt>remove_belongs_to</tt> are acceptable. References are reversible. + +<ruby> +# Create a user_id column +add_reference(:products, :user) + +# Create a supplier_id, supplier_type columns and appropriate index +add_reference(:products, :supplier, polymorphic: true, index: true) + +# Remove polymorphic reference +remove_reference(:products, :supplier, polymorphic: true) +</ruby> + + * Add <tt>:default</tt> and <tt>:null</tt> options to <tt>column_exists?</tt>. <ruby> @@ -336,14 +350,17 @@ column_exists?(:testings, :taggable_id, :integer, null: false) column_exists?(:testings, :taggable_type, :string, default: 'Photo') </ruby> -* <tt>ActiveRelation#inspect</tt> no longer calls <tt>#to_a</tt>. This means that in places where <tt>#inspect</tt> is implied (such as in the console), creating a relation will not execute it anymore, you'll have to call <tt>#to_a</tt> when necessary: +* <tt>ActiveRecord::Relation#inspect</tt> now makes it clear that you are dealing with a <tt>Relation</tt> object rather than an array: <ruby> -User.where(:age => 30) # => returns the relation -User.where(:age => 30).to_a # => executes the query and returns the loaded objects, as before +User.where(:age => 30).inspect +# => <ActiveRecord::Relation [#<User ...>, #<User ...>]> + +User.where(:age => 30).to_a.inspect +# => [#<User ...>, #<User ...>] </ruby> -* Add <tt>collation</tt> and <tt>ctype</tt> support to PostgreSQL. These are available for PostgreSQL 8.4 or later. +* Add <tt>:collation</tt> and <tt>:ctype</tt> support to PostgreSQL. These are available for PostgreSQL 8.4 or later. <yaml> development: @@ -506,7 +523,7 @@ Post.find_by! name: 'Spartacus' * Added <tt>ActiveRecord::Base#slice</tt> to return a hash of the given methods with their names as keys and returned values as values. -* Remove IdentityMap - IdentityMap has never graduated to be an "enabled-by-default" feature, due to some inconsistencies with associations, as described in this commit: https://github.com/rails/rails/commit/302c912bf6bcd0fa200d964ec2dc4a44abe328a6. Hence the removal from the codebase, until such issues are fixed. +* Remove IdentityMap - IdentityMap has never graduated to be an "enabled-by-default" feature, due to some inconsistencies with associations, as described in this "commit":https://github.com/rails/rails/commit/302c912bf6bcd0fa200d964ec2dc4a44abe328a6. Hence the removal from the codebase, until such issues are fixed. * Added a feature to dump/load internal state of +SchemaCache+ instance because we want to boot more quickly when we have many models. @@ -708,7 +725,7 @@ h4(#activemodel_deprecations). Deprecations h3. Active Resource -* Active Resource is removed from Rails 4.0 and is now a separate gem. TODO: put a link to the gem here. +* Active Resource is removed from Rails 4.0 and is now a separate "gem":https://github.com/rails/activeresource. h3. Active Support |