Perf: Don't load the association for #delete_all.

Bug #6289

Conflicts:

	activerecord/test/cases/associations/has_many_associations_test.rb

1 files changed, 12 insertions, 0 deletions

diff --git a/activerecord/test/cases/associations/has_many_associations_test.rb b/activerecord/test/cases/associations/has_many_associations_test.rb
index a28b8e6651..c128ede34f 100644
--- a/activerecord/test/cases/associations/has_many_associations_test.rb
+++ b/activerecord/test/cases/associations/has_many_associations_test.rb
@@ -1698,4 +1698,16 @@ class HasManyAssociationsTest < ActiveRecord::TestCase
     assert_equal [bulb1, bulb3], car.bulbs
     assert_equal [bulb1, bulb3], result
   end
+
+  test "delete_all, when not loaded, doesn't load the records" do
+    post = posts(:welcome)
+
+    assert post.taggings_with_delete_all.count > 0
+    assert !post.taggings_with_delete_all.loaded?
+
+    # 2 queries: one DELETE and another to update the counter cache
+    assert_queries(2) do
+      post.taggings_with_delete_all.delete_all
+    end
+  end
 end