Merge branch 'master' into treewip

* master: (27 commits)
  move digest cache on to the DetailsKey object
  remove object `hash` cache
  [ci skip] fix suggested change-replace 'an' with 'the in Rails engine guide'
  Missing documentation about hash algorithm option for MessageVerifier [ci skip]
  set `skip_listen` option to dummy appplication
  Fix the language in engines guide
  Add accidentally removed `#` [ci skip]
  fields_for_style needs to test for AC::Parameters
  Fix indentation for code block in changelog
  Remove accidentally duplicated change log title [ci skip]
  partially revert 69009f4473637a44ade26d954ef5ddea6ff903f2
  Remove needless `case_insensitive_comparison` in mysql2 adapter
  modify to `error` also abort when specify fail fast option
  Implement ActionController::Parameters#inspect
  remove unused method
  Remove unused Journey code
  Add Action Cable CHANGELOG in release notes [ci skip]
  Show proper error message when a non-relation object is passed to AR::Relation#or
  Fix semantics of test names for finish option in batches_test
  Fix typo
  ...

Conflicts:
	actionview/lib/action_view/digestor.rb

1 files changed, 2 insertions, 0 deletions

diff --git a/activerecord/test/models/car.rb b/activerecord/test/models/car.rb
index 778c22b1f6..0f37e9a289 100644
--- a/activerecord/test/models/car.rb
+++ b/activerecord/test/models/car.rb
@@ -12,6 +12,8 @@ class Car < ActiveRecord::Base
   has_many :engines, :dependent => :destroy, inverse_of: :my_car
   has_many :wheels, :as => :wheelable, :dependent => :destroy
 
+  has_many :price_estimates, :as => :estimate_of
+
   scope :incl_tyres, -> { includes(:tyres) }
   scope :incl_engines, -> { includes(:engines) }