5 files changed, 31 insertions, 3 deletions
diff --git a/activerecord/test/models/club.rb b/activerecord/test/models/club.rb
index 13e72e9c50..bb49fb300c 100644
--- a/activerecord/test/models/club.rb
+++ b/activerecord/test/models/club.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class Club < ActiveRecord::Base
-  has_one :membership
+  has_one :membership, touch: true
   has_many :memberships, inverse_of: false
   has_many :members, through: :memberships
   has_one :sponsor
@@ -12,6 +12,8 @@ class Club < ActiveRecord::Base
 
   scope :general, -> { left_joins(:category).where(categories: { name: "General" }).unscope(:limit) }
 
+  accepts_nested_attributes_for :membership
+
   private
 
     def private_method
diff --git a/activerecord/test/models/post.rb b/activerecord/test/models/post.rb
index 61e5f14100..090b576a5d 100644
--- a/activerecord/test/models/post.rb
+++ b/activerecord/test/models/post.rb
@@ -11,6 +11,10 @@ class Post < ActiveRecord::Base
     def author
       "lifo"
     end
+
+    def greeting
+      super + " :)"
+    end
   end
 
   module NamedExtension2
@@ -203,6 +207,10 @@ end
 
 class SubAbstractStiPost < AbstractStiPost; end
 
+class NullPost < Post
+  default_scope { none }
+end
+
 class FirstPost < ActiveRecord::Base
   self.inheritance_column = :disabled
   self.table_name = "posts"
@@ -315,8 +323,8 @@ class FakeKlass
       "posts"
     end
 
-    def attribute_alias?(name)
-      false
+    def attribute_aliases
+      {}
     end
 
     def sanitize_sql(sql)
diff --git a/activerecord/test/models/section.rb b/activerecord/test/models/section.rb
new file mode 100644
index 0000000000..f8b4cc7936
--- /dev/null
+++ b/activerecord/test/models/section.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class Section < ActiveRecord::Base
+  belongs_to :session, inverse_of: :sections, autosave: true
+  belongs_to :seminar, inverse_of: :sections, autosave: true
+end
diff --git a/activerecord/test/models/seminar.rb b/activerecord/test/models/seminar.rb
new file mode 100644
index 0000000000..c18aa86433
--- /dev/null
+++ b/activerecord/test/models/seminar.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class Seminar < ActiveRecord::Base
+  has_many :sections, inverse_of: :seminar, autosave: true, dependent: :destroy
+  has_many :sessions, through: :sections
+end
diff --git a/activerecord/test/models/session.rb b/activerecord/test/models/session.rb
new file mode 100644
index 0000000000..db66b5297e
--- /dev/null
+++ b/activerecord/test/models/session.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class Session < ActiveRecord::Base
+  has_many :sections, inverse_of: :session, autosave: true, dependent: :destroy
+  has_many :seminars, through: :sections
+end