module PgSearch::ClassMethods

def multisearchable(options = {})
  include PgSearch::Multisearchable
  class_attribute :pg_search_multisearchable_options
  self.pg_search_multisearchable_options = options
end

def pg_search_scope(name, options)
  options_proc = if options.respond_to?(:call)
                   options
                 else
                   unless options.respond_to?(:merge)
                     raise ArgumentError, "pg_search_scope expects a Hash or Proc"
                   end
                   ->(query) { {:query => query}.merge(options) }
                 end
  define_singleton_method(name) do |*args|
    config = Configuration.new(options_proc.call(*args), self)
    scope_options = ScopeOptions.new(config)
    scope_options.apply(self)
  end
end