class ActiveRecord::Scoping::ScopeRegistry

def value_for(scope_type, model, skip_inherited_scope = false)
  return scope_type[model.name] if skip_inherited_scope
  klass = model
  base = model.base_class
  while klass != base
    value = scope_type[klass.name]
    return value if value
    klass = klass.superclass
  end
  scope_type[klass.name]
end