Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]

Answer 1

As of Ruby 2.3 this gets a little easier. Instead of having to nest try statements or define your own method you can now use Hash#dig (documentation).

h = { foo: {bar: {baz: 1}}}

h.dig(:foo, :bar, :baz)           #=> 1
h.dig(:foo, :zot)                 #=> nil

Or in the example above:

session.dig(:comments, @comment.id, "temp_value")

This has the added benefit of being more like try than some of the examples above. If any of the arguments lead to the hash returning nil then it will respond nil.