Replace ActiveSupport method

lib/paapi/item.rb

@@ -50,7 +50,7 @@ module Paapi
     end
 
     def contributors_of(kind)
-      contributors&.select { |e| e['Role'] == kind.to_s.titlecase }&.map { |e| Nameable(e['Name'])}
+      contributors&.select { |e| e['Role'] == kind.to_s.gsub(/([[:alpha:]]+)/) { |w| w.capitalize } }&.map { |e| Nameable(e['Name'])}
     end
 
     def actors

lib/paapi/response.rb

@@ -8,9 +8,6 @@ module Paapi
       @http_response = response
       @json = JSON.parse(response.body.to_s)
 
-      @datas = symbolise(JSON.parse(response.body.to_s))
-      @doc  = JSON.parse(@datas.to_json, object_class: OpenStruct)
-
       @items_data = @json.dig('ItemsResult', 'Items')
       @items_data ||= @json.dig('SearchResult', 'Items')
       @items_data ||= []
@@ -23,24 +20,7 @@ module Paapi
       @json.dig('SearchResult', 'TotalResultCount')
     end
 
-    def snake_case(s)
-      return s.downcase if s.match(/\A[A-Z]+\z/)
 
-      s.gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2').
-      gsub(/([a-z])([A-Z])/, '\1_\2').
-      downcase
-    end
-
-    def symbolise(obj)
-      if obj.is_a? Hash
-        return obj.inject({}) do |memo, (k, v)|
-          memo.tap { |m| m[snake_case(k)] = symbolise(v) }
-        end
-      elsif obj.is_a? Array
-        return obj.map { |memo| symbolise(memo) }
-      end
-      obj
-    end
 
   end
 end