Merge pull request #10050 from neerajdotname/no-need-of-to_s-before-intern

no need to invoke to_s before applying intern

activerecord/lib/active_record/associations/join_dependency.rb

@@ -108,7 +108,7 @@ def build(associations, parent = nil, join_type = Arel::InnerJoin)
         parent ||= join_parts.last
         case associations
         when Symbol, String
-          reflection = parent.reflections[associations.to_s.intern] or
+          reflection = parent.reflections[associations.intern] or
           raise ConfigurationError, "Association named '#{ associations }' was not found; perhaps you misspelled it?"
           unless join_association = find_join_association(reflection, parent)
             @reflections << reflection