How can a partial called "cart" be rendered from a controller called "ProductsController", assuming the partial is in a directory called "shared"?

What does the 4xx series of HTTP errors represent?

Which of the following validations in Rails checks for null fields?

Using ERB for views, what filename should be given to a partial called 'login'?

What is output of following statements? 1) '.nil? == '.empty? && '.blank? == '.empty? 2) !'.nil? == '.empty? && '.blank? == '.empty? 3) nil.nil? == nil.empty? && nil.blank? == nil.empty? 4) !'.blank? == '.present? 5) '.any? == !'.empty? 6) '.blank? == '.empty?

For the String class, what's the difference between '#slice' and '#slice!'?

a = (1..3).reduce(-6){ |i,x| x + i } puts a

[1,2,3,5,8,13].include? '8'

The databases supported by ActiveRecord without any other gem are:

What is the purpose of config.ru file?

The best practice says: