fuzzy_search.rb

#Credits to Carlos Souza
#I've made some changes for search works in strings with special caracters like accents.

#In the model
scope :search, ->(keyword) { where('keywords LIKE ?', "%#{I18n.transliterate(keyword.downcase)}%") if keyword.present? }

before_save :set_keywords
validates :title, :author, :description, presence: true

protected

def set_keywords
  keywords = [title, author, description].map(&:downcase).join(' ')
  self.keywords = I18n.transliterate(keywords)
end

# In controller you will do something like this

def index
  @resources = Resorce.search(params[:keyword])
end

Before all that, I created a migration that add a text field named "keywords" to the table I'm going to perform the search.

title, author and description are examples of fields that I have in the model and the search will perform in those fields. Replace it with any field that you want the search to be performed.