TableMetadata#associated_table look for reflections by table_name

activerecord/lib/active_record/table_metadata.rb

@@ -27,7 +27,7 @@ def associated_with?(table_name)
     end
 
     def associated_table(table_name)
-      reflection = klass._reflect_on_association(table_name) || klass._reflect_on_association(table_name.singularize)
+      reflection = klass._reflect_on_association(table_name) || klass._reflect_on_association(table_name.singularize) || klass.reflections.values.detect { |reflection| reflection.table_name == table_name }
 
       if !reflection && table_name == arel_table.name
         return self