lib/ews/soap/ews_soap_free_busy_response.rb
def find_in_hash_list(collection, key)
      result = collection.find { |hsh| hsh.keys.include?(key) }
      result ? result[key] : nil
    end
def find_in_hash_list(collection, key)
      result = collection.find { |hsh| hsh.keys.include?(key) }
      result ? result[key] : nil
    end
Find the first element in a list of hashes or return nil
 Example:
     find_in_hash_list([{:foo => :bar}, {:bar => :baz}], :foo)
     => :bar