1 files changed, 1 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb b/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
index 0140aa15c8..2072f93194 100644
--- a/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
+++ b/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
@@ -46,7 +46,6 @@ module ActiveRecord::Associations::Builder # :nodoc:
         end
 
         private
-
           def self.suppress_composite_primary_key(pk)
             pk unless pk.is_a?(Array)
           end
@@ -63,7 +62,7 @@ module ActiveRecord::Associations::Builder # :nodoc:
 
     def middle_reflection(join_model)
       middle_name = [lhs_model.name.downcase.pluralize,
-                     association_name].join("_").gsub("::", "_").to_sym
+                     association_name.to_s].sort.join("_").gsub("::", "_").to_sym
       middle_options = middle_options join_model
 
       HasMany.create_reflection(lhs_model,
@@ -73,7 +72,6 @@ module ActiveRecord::Associations::Builder # :nodoc:
     end
 
     private
-
       def middle_options(join_model)
         middle_options = {}
         middle_options[:class_name] = "#{lhs_model.name}::#{join_model.name}"