How to implement multiselect in select (rails)?

Question

Ruby on Rails

Hello, there is a table with drug prices.
I need to make a selection of several drugs from select, because now I can only select one drug.

<%= f.select( :user_prices, Price.all.map {|c| [c.title]}, {:multiple=>true}) %>

Answer 1

Do this:
<%= f.select( :user_prices, Price.all.map {|c| [c.title, c.id ]}, {} , {:multiple=>true}) %>
`select` method takes 3 parameters + hash.