Remove save_changes

CHANGELOG.md

@@ -20,6 +20,10 @@ recommendations of [keepachangelog.com](http://keepachangelog.com/).
 - Removed `touch_with_version`, was deprecated in 9.0.0
 - [#1121](https://github.com/paper-trail-gem/paper_trail/issues/1121) -
   `touch` now always inserts `null` in `object_changes`.
+- [#1099](https://github.com/paper-trail-gem/paper_trail/issues/1099) -
+  Removed `save_changes`. For those wanting to save space, it's more effective
+  to drop the `object` column. To preserve the old behavior you can add an
+  `object_changes_adapter`.
 
 ### Added
 

README.md

@@ -723,10 +723,6 @@ For diffing two ActiveRecord objects:
 * [activerecord-diff][23]: rather like ActiveRecord::Dirty but also allows you
   to specify which columns to compare.
 
-If you want to selectively record changes for some models but not others you
-can opt out of recording changes by passing `save_changes: false` to your
-`has_paper_trail` method declaration.
-
 ### 3.d. Deleting Old Versions
 
 Over time your `versions` table will grow to an unwieldy size.  Because each

lib/paper_trail/events/base.rb

@@ -249,8 +249,7 @@ def recordable_object_changes(changes)
       #
       # @api private
       def record_object_changes?
-        @record.paper_trail_options[:save_changes] &&
-          @record.class.paper_trail.version_class.column_names.include?("object_changes")
+        @record.class.paper_trail.version_class.column_names.include?("object_changes")
       end
 
       # Returns a boolean indicating whether to store the original object during save.

lib/paper_trail/has_paper_trail.rb

@@ -51,8 +51,6 @@ module ClassMethods
       #   is `:versions`.
       # - :version - The name to use for the method which returns the version
       #   the instance was reified from. Default is `:version`.
-      # - :save_changes - Whether or not to save changes to the object_changes
-      #   column if it exists. Default is true
       # - :join_tables - If the model has a has_and_belongs_to_many relation
       #   with an unpapertrailed model, passing the name of the association to
       #   the join_tables option will paper trail the join table but not save

lib/paper_trail/model_config.rb

@@ -231,9 +231,6 @@ def setup_options(options)
       end
 
       @model_class.paper_trail_options[:meta] ||= {}
-      if @model_class.paper_trail_options[:save_changes].nil?
-        @model_class.paper_trail_options[:save_changes] = true
-      end
     end
   end
 end

spec/dummy_app/app/models/thing.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class Thing < ActiveRecord::Base
-  has_paper_trail save_changes: false
+  has_paper_trail
 
   if ActiveRecord.gem_version >= Gem::Version.new("5.0")
     belongs_to :person, optional: true