Category "nomethoderror"

Options_from_collection_for_select - NoMethodError Or ArgumentError - how add properly argument?

In Rails console when I write Something like: City.human_attribute_name("model") it's work correctly, a return value, but when I try to use it in .haml in Optio

Sinatra NoMethodError at / undefined method `stylesheet_link_tag' for #

I am currently making an app with sinatra and i've been working for hours to try to implement bootstrap in it, and realizing how much easier it is in rails. An