Make HABTM#create behave the same as << with after_add callbacks. Closes

 #11374 [freels]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@9224 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb

@@ -148,15 +148,14 @@ def finding_with_ambiguous_select?(select_clause)
         end
 
       private
-        def create_record(attributes)
+        def create_record(attributes, &block)
           # Can't use Base.create because the foreign key may be a protected attribute.
           ensure_owner_is_not_new
           if attributes.is_a?(Array)
             attributes.collect { |attr| create(attr) }
           else
-            record = build(attributes)
-            yield(record)
-            record
+            load_target
+            build_record(attributes, &block)
           end
         end
     end

activerecord/test/cases/associations/callbacks_test.rb

@@ -94,6 +94,21 @@ def test_has_and_belongs_to_many_add_callback
                   "after_adding#{david.id}"], ar.developers_log
   end
 
+  def test_has_and_belongs_to_many_after_add_called_after_save
+    ar = projects(:active_record)
+    assert ar.developers_log.empty?
+    alice = Developer.new(:name => 'alice')
+    ar.developers_with_callbacks << alice
+    assert_equal"after_adding#{alice.id}", ar.developers_log.last
+
+    bob = ar.developers_with_callbacks.create(:name => 'bob')
+    assert_equal "after_adding#{bob.id}", ar.developers_log.last
+
+    ar.developers_with_callbacks.build(:name => 'charlie')
+    assert_equal "after_adding<new>", ar.developers_log.last
+  end
+
+
   def test_has_and_belongs_to_many_remove_callback
     david = developers(:david)
     jamis = developers(:jamis)