Fix dependence on has_one/belongs_to relationships

When a class has a belongs_to or has_one relationship with dependent: :destroy
option enabled, objects of this class should not be deleted if it's dependents
cannot be deleted.

Example:

    class Parent
      has_one :child, dependent: :destroy
    end

    class Child
      belongs_to :parent, inverse_of: :child
      before_destroy { throw :abort }
    end

    c = Child.create
    p = Parent.create(child: c)

    p.destroy

    p.destroyed? # expected: false; actual: true;

Fixes #32022

2 files changed, 48 insertions, 0 deletions

diff --git a/activerecord/test/cases/associations/belongs_to_associations_test.rb b/activerecord/test/cases/associations/belongs_to_associations_test.rb
index 9e6d94191b..6b4f826766 100644
--- a/activerecord/test/cases/associations/belongs_to_associations_test.rb
+++ b/activerecord/test/cases/associations/belongs_to_associations_test.rb
@@ -931,6 +931,30 @@ class BelongsToAssociationsTest < ActiveRecord::TestCase
     assert_equal error.message, "The :dependent option must be one of [:destroy, :delete], but is :nullify"
   end
 
+  class DestroyableBook < ActiveRecord::Base
+    self.table_name = "books"
+    belongs_to :author, class_name: "UndestroyableAuthor", dependent: :destroy
+  end
+
+  class UndestroyableAuthor < ActiveRecord::Base
+    self.table_name = "authors"
+    has_one :book, class_name: "DestroyableBook", foreign_key: "author_id"
+    before_destroy :dont
+
+    def dont
+      throw(:abort)
+    end
+  end
+
+  def test_dependency_should_halt_parent_destruction
+    author = UndestroyableAuthor.create!(name: "Test")
+    book = DestroyableBook.create!(author: author)
+
+    assert_no_difference ["UndestroyableAuthor.count", "DestroyableBook.count"] do
+      assert_not book.destroy
+    end
+  end
+
   def test_attributes_are_being_set_when_initialized_from_belongs_to_association_with_where_clause
     new_firm = accounts(:signals37).build_firm(name: "Apple")
     assert_equal new_firm.name, "Apple"
diff --git a/activerecord/test/cases/associations/has_one_associations_test.rb b/activerecord/test/cases/associations/has_one_associations_test.rb
index 1a213ef7e4..602fe52701 100644
--- a/activerecord/test/cases/associations/has_one_associations_test.rb
+++ b/activerecord/test/cases/associations/has_one_associations_test.rb
@@ -725,4 +725,28 @@ class HasOneAssociationsTest < ActiveRecord::TestCase
 
     assert_not DestroyByParentBook.exists?(book.id)
   end
+
+  class UndestroyableBook < ActiveRecord::Base
+    self.table_name = "books"
+    belongs_to :author, class_name: "DestroyableAuthor"
+    before_destroy :dont
+
+    def dont
+      throw(:abort)
+    end
+  end
+
+  class DestroyableAuthor < ActiveRecord::Base
+    self.table_name = "authors"
+    has_one :book, class_name: "UndestroyableBook", foreign_key: "author_id", dependent: :destroy
+  end
+
+  def test_dependency_should_halt_parent_destruction
+    author = DestroyableAuthor.create!(name: "Test")
+    UndestroyableBook.create!(author: author)
+
+    assert_no_difference ["DestroyableAuthor.count", "UndestroyableBook.count"] do
+      assert_not author.destroy
+    end
+  end
 end