Dont check for class equaity when merging relations

2 files changed, 0 insertions, 8 deletions

diff --git a/activerecord/lib/active_record/relation/spawn_methods.rb b/activerecord/lib/active_record/relation/spawn_methods.rb
index 4ac9e50f5a..d5b13c6100 100644
--- a/activerecord/lib/active_record/relation/spawn_methods.rb
+++ b/activerecord/lib/active_record/relation/spawn_methods.rb
@@ -15,10 +15,6 @@ module ActiveRecord
     end
 
     def merge(r)
-      if r.klass != @klass
-        raise ArgumentError, "Cannot merge a #{r.klass.name}(##{r.klass.object_id}) relation with #{@klass.name}(##{@klass.object_id}) relation"
-      end
-
       merged_relation = spawn
       return merged_relation unless r
 
diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index acf247d27b..e31d0ee3e8 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -420,10 +420,6 @@ class RelationTest < ActiveRecord::TestCase
     end
   end
 
-  def test_invalid_merge
-    assert_raises(ArgumentError) { Post.scoped & Developer.scoped }
-  end
-
   def test_count
     posts = Post.scoped