How to find and return a hash value within an array of hashes, given multiple other values in the hash

Question

I have this array of hashes:

results = [
   {"day"=>"2012-08-15", "name"=>"John", "calls"=>"5"},
   {"day"=>"2012-08-15", "name"=>"Bill", "calls"=>"8"},
   {"day"=>"2012-08-16", "name"=>"Bill", "calls"=>"11"},
]

How can I search the results to find how many calls Bill made on the 15th?

After reading the answers to "Ruby easy search for key-value pair in an array of hashes", I think it might involve expanding upon the following find statement:

results.find { |h| h['day'] == '2012-08-15' }['calls']

Solution 1

You're on the right track!

results.find {|i| i["day"] == "2012-08-15" and i["name"] == "Bill"}["calls"]
# => "8"

Solution 2

results.select { |h| h['day'] == '2012-08-15' && h['name'] == 'Bill' }
  .reduce(0) { |res,h| res += h['calls'].to_i } #=> 8