hash_lookup

{
  a: { id: 1, name: 'abc' },
  b: { id: 2, name: 'def' }
}

path_hash = Hash.new { |h,k|
  if k == '*'
    -> matcher {
      if matcher.is_a?(Hash)
        match_key, match_value = matcher.first
        h.select { |_, sub_hash| match_value === sub_hash[match_key] }
      else
        h.select { |_,v| v[k2] }
      end
    }
  else
    h[k] = Hash.new(&h.default_proc)
  end
}

path_hash[:a] = { id: 1, name: 'abc' }
path_hash[:b] = { id: 2, name: 'def' }
path_hash['*'][{name: 'def'}]