Question

I have a hash (the real one is much bigger)

parsed = {"follower_count" => 500, "something_else" => "etc", "xyz" => "abc"}

and a class hanging around that looks like this

 class Company
   attr_accessor :followers

   def initialize(thehash)
      @followers = thehash['follower_count']
   end
 end

So lastly there is this code which throws the error before I can worry about anything else going wrong

>> parsed.map {|t| Company.new(t)}
TypeError: can't convert String into Integer
  from (irb):7:in `[]'
  from (irb):7:in `initialize'
  from (irb):12:in `new'
  from (irb):12
  from (irb):12:in `map'
  from (irb):12:in `each'
  from (irb):12:in `map'
  from (irb):12

Answer 1

When you iterate over a Hash, the block gets an array as its argument and that array contains (in order) the key and value for one pair in the Hash. So, in here:

parsed.map { |t| ... }

t is actually a two element array and is usually written:

parsed.map { |k, v| ... }

Then, inside Company#initialize, you’re treating t as a Hash when it is actually a two element Array.

You don’t want to use map on parsed at all, you just want to Company.new(parsed).