In Ruby, ensure clause ensures that the code block is executed when an exception is raised or not.

def foo
  'foo'
ensure
  puts 'ensure'
end

foo # => 'ensure' is output

However, the value in ensure clause is not returned implicitly.

def foo
  'foo'
ensure
  'ensure'
end

foo # => 'foo', not 'ensure'

You need to return value explicitly with return.

def foo
  'foo'
ensure
  return 'ensure'
end

foo # => 'ensure'