gistfile1.rb

class Anime
  pg_search_scope :search,
    against: { title: 'A', alt_title: 'A', synopsis: 'C' },
    using: {
      tsearch: {
        prefix: true,
        # Normalize to string length and scale to 0..1
        normalization: 32,
        dictionary: 'english'
      },
      trigram: {
        only: [:title, :alt_title],
      }
    },
    # Combine trigram and tsearch values
    ranked_by: ':trigram + :tsearch'
end