store the serialized column values in the @attributes hash

3 files changed, 16 insertions, 14 deletions

diff --git a/activerecord/lib/active_record/attribute_methods/write.rb b/activerecord/lib/active_record/attribute_methods/write.rb
index 6a593a7e0e..5eba94ec66 100644
--- a/activerecord/lib/active_record/attribute_methods/write.rb
+++ b/activerecord/lib/active_record/attribute_methods/write.rb
@@ -23,7 +23,8 @@ module ActiveRecord
         if (column = column_for_attribute(attr_name)) && column.number?
           @attributes[attr_name] = convert_number_column_value(value)
         else
-          @attributes[attr_name] = value
+          coder = self.class.serialized_attributes[attr_name]
+          @attributes[attr_name] = coder ? coder.dump(value) : value
         end
       end
 
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 5310b55a92..6b82b827b0 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1739,18 +1739,25 @@ MSG
       # Returns a copy of the attributes hash where all the values have been safely quoted for use in
       # an Arel insert/update method.
       def arel_attributes_values(include_primary_key = true, include_readonly_attributes = true, attribute_names = @attributes.keys)
-        attrs = {}
+        attrs      = {}
+        klass      = self.class
+        arel_table = klass.arel_table
+
         attribute_names.each do |name|
           if (column = column_for_attribute(name)) && (include_primary_key || !column.primary)
 
             if include_readonly_attributes || (!include_readonly_attributes && !self.class.readonly_attributes.include?(name))
-              value = read_attribute(name)
 
-              coder = self.class.serialized_attributes[name]
-              if !value.nil? && coder
-                value = coder.dump value
-              end
-              attrs[self.class.arel_table[name]] = value
+              value = if klass.serialized_attributes[name]
+                        @attributes[name]
+                      else
+                        # FIXME: we need @attributes to be used consistently.
+                        # If the values stored in @attributes were already type
+                        # casted, this code could be simplified
+                        read_attribute(name)
+                      end
+
+              attrs[arel_table[name]] = value
             end
           end
         end
diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index a96796f9ff..76110b73e4 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -15,12 +15,6 @@ module ActiveRecord
       def validate_each(record, attribute, value)
         finder_class = find_finder_class_for(record)
 
-        coder = record.class.serialized_attributes[attribute.to_s]
-
-        if value && coder
-          value = coder.dump value
-        end
-
         sql, params = mount_sql_and_params(finder_class, record.class.quoted_table_name, attribute, value)
 
         relation = finder_class.unscoped.where(sql, *params)