Iterating over hash of arrays

Question

I have the following:

@products = {
  2 => [
    #<Review id: 9, answer01: 3, score: 67, style_id: 2, consumer_id: 2,
    branch_id: 2, business_id: 2>
  ],
  15 => [
    #<Review id: 10, answer01: 3, score: 67, style_id: 2, consumer_id: 2,
    branch_id: 2, business_id: 2>,
    #<Review id: 11, answer01: 3, score: 67, style_id: 2, consumer_id: 2,
    branch_id: 2, business_id: 2>
  ]
}

I want to average the scores for all reviews associated with each product's hash key. How can I do this?

Answer 1

To iterate over a hash:

hash = {}
hash.each_pair do |key,value|
  #code
end

To iterate over an array:

arr=[]
arr.each do |x|
  #code
end

So iterating over a hash of arrays (let's say we're iterating over each array in each point in the hash) would be done like so:

hash = {}
hash.each_pair do |key,val|
  hash[key].each do |x|
    #your code, for example adding into count and total inside program scope
  end
end