pg_search_config.rb

# ===== MULTISEARCH ===== #
include PgSearch::Model
multisearchable against: [:attributes, :you, :want, :to, :index]
def search(query)
  found_ids = PgSearch.multisearch(query).pluck(:searchable_id)
  YourModel.where(id: found_ids)
end
# configure type search options
PgSearch.multisearch_options = {
  using: :tsearch
}
YourModel.search('What ever you want to search')

# ===== SCOPES ===== #
include PgSearch::Model
pg_search_scope :search_scope_name, against: [:attributes, :you, :want, :to, :index]
YourModel.search_scope_name('What ever you want to search')