Merge pull request #21550 from didacte/unscope-associations

ActiveRecord: use association's `unscope` when preloading

activerecord/CHANGELOG.md

+*   Correctly apply `unscope` when preloading through associations.
+
+    *Jimmy Bourassa*
+
 *   Fixed taking precision into count when assigning a value to timestamp attribute
 
     Timestamp column can have less precision than ruby timestamp

activerecord/lib/active_record/associations/preloader/association.rb

@@ -154,7 +154,7 @@ def build_scope
             scope.where!(klass.table_name => { reflection.type => model.base_class.sti_name })
           end
 
-          scope.unscope_values = Array(values[:unscope])
+          scope.unscope_values = Array(values[:unscope]) + Array(preload_values[:unscope])
           klass.default_scoped.merge(scope)
         end
       end

activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb

@@ -95,6 +95,15 @@ def category
   has_and_belongs_to_many :projects, extend: NamedExtension
 end
 
+class ProjectUnscopingDavidDefaultScope < ActiveRecord::Base
+  self.table_name = 'projects'
+  has_and_belongs_to_many :developers, -> { unscope(where: 'name') },
+    class_name: "LazyBlockDeveloperCalledDavid",
+    join_table: "developers_projects",
+    foreign_key: "project_id",
+    association_foreign_key: "developer_id"
+end
+
 class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
   fixtures :accounts, :companies, :categories, :posts, :categories_posts, :developers, :projects, :developers_projects,
            :parrots, :pirates, :parrots_pirates, :treasures, :price_estimates, :tags, :taggings, :computers
@@ -936,4 +945,16 @@ def test_alternate_database
     end
     assert_equal 1, professor.courses.count
   end
+
+  def test_habtm_scope_can_unscope
+    project = ProjectUnscopingDavidDefaultScope.new
+    project.save!
+
+    developer = LazyBlockDeveloperCalledDavid.new(name: "Not David")
+    developer.save!
+    project.developers << developer
+
+    projects = ProjectUnscopingDavidDefaultScope.includes(:developers).where(id: project.id)
+    assert_equal 1, projects.first.developers.size
+  end
 end