module PgSearch::Model::ClassMethods

def pg_search_scope(name, options)
  options_proc = if options.respond_to?(:call)
                   options
                 elsif options.respond_to?(:merge)
                   ->(query) { { query: query }.merge(options) }
                 else
                   raise ArgumentError, 'pg_search_scope expects a Hash or Proc'
                 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