def set_content_type_and_size_in_model
      model.content_type = file.content_type if file.content_type
      model.file_size = file.size
    end
def set_content_type_and_size_in_model
      model.content_type = file.content_type if file.content_type
      model.file_size = file.size
    end
Copies the content type and file size to the model where this is mounted.

 Returns nothing.