Question

I am trying to refactor my code (before it was a bunch of if/else-if statements) using some Ruby magic. However, when I try to use code blocks as my value in a hash, I get the following error:

syntax error, unexpected '}', expecting tASSOC :restaurant => { Cuisine.all },

This same error repeats for the next line and the line after (:hotel and :attraction).

What am I doing incorrectly here?

def moderation_categories(klass) 
  klass_map = {
    :restaurant => { Cuisine.all },
    :hotel      => { Category.where(place_type: "Hotel") },
    :attraction => { Category.where(place_type: "Attraction") }
  }
  list = []
  klass_map[klass.to_sym].call.each { |c| list << c.name }

  list.sort
end

Answer 1

A block does not just stand as a lambda (code block). You must specify it to be a lambda or a Proc.

  klass_map = {
    :restaurant => lambda{ Cuisine.all },
    :hotel      => lambda{ Category.where(place_type: "Hotel") },
    :attraction => lambda{ Category.where(place_type: "Attraction") }
  }