diff options
| -rw-r--r-- | activerecord/lib/active_record/relation/merger.rb | 3 | ||||
| -rw-r--r-- | activerecord/test/cases/relation/merging_test.rb | 7 |
2 files changed, 10 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/relation/merger.rb b/activerecord/lib/active_record/relation/merger.rb index cb971eb255..396638d74d 100644 --- a/activerecord/lib/active_record/relation/merger.rb +++ b/activerecord/lib/active_record/relation/merger.rb @@ -141,6 +141,9 @@ module ActiveRecord end def merge_single_values + if relation.from_clause.empty? + relation.from_clause = other.from_clause + end relation.lock_value ||= other.lock_value unless other.create_with_value.blank? diff --git a/activerecord/test/cases/relation/merging_test.rb b/activerecord/test/cases/relation/merging_test.rb index 0a2e874e4f..60a806c05a 100644 --- a/activerecord/test/cases/relation/merging_test.rb +++ b/activerecord/test/cases/relation/merging_test.rb @@ -104,6 +104,13 @@ class RelationMergingTest < ActiveRecord::TestCase post = PostThatLoadsCommentsInAnAfterSaveHook.create!(title: "First Post", body: "Blah blah blah.") assert_equal "First comment!", post.comments.where(body: "First comment!").first_or_create.body end + + def test_merging_with_from_clause + relation = Post.all + assert relation.from_clause.empty? + relation = relation.merge(Post.from("posts")) + refute relation.from_clause.empty? + end end class MergingDifferentRelationsTest < ActiveRecord::TestCase |