have the builder create the middle reflection

1 files changed, 13 insertions, 2 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 4b47824148..2f79976594 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
@@ -80,6 +80,19 @@ module ActiveRecord::Associations::Builder
       join_model
     end
 
+    def middle_reflection(join_model)
+      middle_name = [lhs_model.name.downcase.pluralize,
+                     association_name].join('_').gsub(/::/, '_').to_sym
+      middle_options = middle_options join_model
+      hm_builder = HasMany.create_builder(lhs_model,
+                                          middle_name,
+                                          nil,
+                                          middle_options)
+      hm_builder.build lhs_model
+    end
+
+    private
+
     def middle_options(join_model)
       middle_options = {}
       middle_options[:class] = join_model
@@ -90,8 +103,6 @@ module ActiveRecord::Associations::Builder
       middle_options
     end
 
-    private
-
     def belongs_to_options(options)
       rhs_options = {}