Make associative_create_statement protected rather than private, so it can be accessed by subclasses.  This makes it easy for subclasses to add custom fields to the impression.
Make associative_create_statement protected rather than private, so it can be accessed by subclasses.  This makes it easy for subclasses to add custom fields to the impression.

firmanm/impressionist,firmanm/impressionist,firmanm/impressionist,charlotte-ruby/impressionist,samchen2009/impressionist,charlotte-ruby/impressionist,guodongme/impressionist,charlotte-ruby/impressionist,guodongme/impressionist,guodongme/impressionist,samchen2009/impressionist,samchen2009/impressionist