Fixed issue with size validations and the removal of size column requirements.

lib/paperclip.rb

@@ -181,7 +181,7 @@ module Paperclip
       message = options[:message] || "file size must be between :min and :max bytes."
 
       attachment_definitions[name][:validations][:size] = lambda do |attachment, instance|
-        if attachment.file? && !range.include?(attachment.instance_read(:file_size).to_i)
+        if attachment.file? && !range.include?(attachment.size.to_i)
           message.gsub(/:min/, min.to_s).gsub(/:max/, max.to_s)
         end
       end

lib/paperclip/attachment.rb

@@ -152,6 +152,10 @@ module Paperclip
       instance_read(:file_name)
     end
 
+    def size
+      instance_read(:file_size) || (@queued_for_write[:original] && @queued_for_write[:original].size)
+    end
+
     def content_type
       instance_read(:content_type)
     end

test/attachment_test.rb

@@ -387,6 +387,11 @@ class AttachmentTest < Test::Unit::TestCase
       assert_nil @dummy.avatar.updated_at
     end
 
+    should "return the right value when sent #avatar_file_size" do
+      @dummy.avatar = @file
+      assert_equal @file.size, @dummy.avatar.size
+    end
+
     context "and avatar_updated_at column" do
       setup do
         ActiveRecord::Base.connection.add_column :dummies, :avatar_updated_at, :timestamp
@@ -423,5 +428,28 @@ class AttachmentTest < Test::Unit::TestCase
       end
     end
 
+    context "and avatar_file_size column" do
+      setup do
+        ActiveRecord::Base.connection.add_column :dummies, :avatar_file_size, :integer
+        rebuild_class
+        @dummy = Dummy.new
+      end
+
+      should "not error when assigned an attachment" do
+        assert_nothing_raised { @dummy.avatar = @file }
+      end
+
+      should "return the right value when sent #avatar_file_size" do
+        @dummy.avatar = @file
+        assert_equal @file.size, @dummy.avatar.size
+      end
+
+      should "return the right value when saved, reloaded, and sent #avatar_file_size" do
+        @dummy.avatar = @file
+        @dummy.save
+        @dummy = Dummy.find(@dummy.id)
+        assert_equal @file.size, @dummy.avatar.size
+      end
+    end
   end
 end