From b6264c43f414f323656ed135d46213466cbe00fb Mon Sep 17 00:00:00 2001
From: Eloy Duran <eloy.de.enige@gmail.com>
Date: Sun, 3 Jan 2010 21:45:08 +0100
Subject: Moved the validation logic to the association reflection and
 refactored autosave_association.rb a bit.

---
 .../lib/active_record/autosave_association.rb      | 39 +++++++++-------------
 activerecord/lib/active_record/reflection.rb       | 13 ++++++++
 2 files changed, 29 insertions(+), 23 deletions(-)

(limited to 'activerecord/lib')

diff --git a/activerecord/lib/active_record/autosave_association.rb b/activerecord/lib/active_record/autosave_association.rb
index b3e28b9373..f01d0903cd 100644
--- a/activerecord/lib/active_record/autosave_association.rb
+++ b/activerecord/lib/active_record/autosave_association.rb
@@ -158,46 +158,39 @@ module ActiveRecord
       #
       # For performance reasons, we don't check whether to validate at runtime,
       # but instead only define the method and callback when needed. However,
-      # this can change, for instance, when using nested attributes. Since we
-      # don't want the callbacks to get defined multiple times, there are
-      # guards that check if the save or validation methods have already been
-      # defined before actually defining them.
+      # this can change, for instance, when using nested attributes, which is
+      # called _after_ the association has been defined. Since we don't want
+      # the callbacks to get defined multiple times, there are guards that
+      # check if the save or validation methods have already been defined
+      # before actually defining them.
       def add_autosave_association_callbacks(reflection)
         save_method = :"autosave_associated_records_for_#{reflection.name}"
         validation_method = :"validate_associated_records_for_#{reflection.name}"
-        force_validation = (reflection.options[:validate] == true || reflection.options[:autosave] == true)
+        collection = reflection.collection_association?
 
-        if reflection.collection_association?
-          unless method_defined?(save_method)
+        unless method_defined?(save_method)
+          if collection
             before_save :before_save_collection_association
 
             define_method(save_method) { save_collection_association(reflection) }
             # Doesn't use after_save as that would save associations added in after_create/after_update twice
             after_create save_method
             after_update save_method
-          end
-
-          if !method_defined?(validation_method) &&
-              (force_validation || (reflection.macro == :has_many && reflection.options[:validate] != false))
-            define_method(validation_method) { validate_collection_association(reflection) }
-            validate validation_method
-          end
-        else
-          unless method_defined?(save_method)
-            case reflection.macro
-            when :has_one
+          else
+            if reflection.macro == :has_one
               define_method(save_method) { save_has_one_association(reflection) }
               after_save save_method
-            when :belongs_to
+            else
               define_method(save_method) { save_belongs_to_association(reflection) }
               before_save save_method
             end
           end
+        end
 
-          if !method_defined?(validation_method) && force_validation
-            define_method(validation_method) { validate_single_association(reflection) }
-            validate validation_method
-          end
+        if reflection.validate? && !method_defined?(validation_method)
+          method = (collection ? :validate_collection_association : :validate_single_association)
+          define_method(validation_method) { send(method, reflection) }
+          validate validation_method
         end
       end
     end
diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb
index 96aac96cda..d6fad5cf29 100644
--- a/activerecord/lib/active_record/reflection.rb
+++ b/activerecord/lib/active_record/reflection.rb
@@ -262,6 +262,19 @@ module ActiveRecord
         @collection_association
       end
 
+      # Returns whether or not the association should be validated as part of
+      # the parent's validation.
+      #
+      # Unless you explicitely disable validation with
+      # <tt>:validate => false</tt>, it will take place when:
+      #
+      # * you explicitely enable validation; <tt>:validate => true</tt>
+      # * you use autosave; <tt>:autosave => true</tt>
+      # * the association is a +has_many+ association
+      def validate?
+        !options[:validate].nil? ? options[:validate] : (options[:autosave] == true || macro == :has_many)
+      end
+
       private
         def derive_class_name
           class_name = name.to_s.camelize
-- 
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