Ruby 2.3.0 introduced a new method called dig
on both Hash
and Array
that solves this problem entirely.
It returns nil
if an element is missing at any level of nesting.
h1 = {}
h2 = { a: {} }
h3 = { a: { b: 100 } }
h1.dig(:a, :b) # => nil
h2.dig(:a, :b) # => nil
h3.dig(:a, :b) # => 100
Your use case would look like this:
@param_info.dig('drug', 'name')