title: Get childobject with child id = x if unknown parents
body: <p>So, consider the following data structure:</p>
  
  <pre><code>{
    "speed" : {
      "scores" : {
        "aHOBsddilrQ2lX3fal8v" : {
          "RrbEpWwfEAeVpnbXabSP" : {
            "event" : 959140,
            "judge" : "Svante",
            "zETdMyzb2OWgrVq9GJwv" : {
              "score" : 65,
              "timestamp" : 1466355355
            },
            "Jd0wtYEs74A2wc47LI7F" : {
              "score" : 75,
              "timestamp" : 1466355465
            }
          }
        }
      }
    }
  } 
  </code></pre>
  
  <p>Is there a way to get the score of the deepest child with the newest timestamp's score if I know <code>authuid</code> and the value of <code>event:</code> but neither of the randomid's (both are unique)</p>
  
  <p>I've tried different approaches with <code>for ()</code> and <code>.orderBy[Child|Key|Value]().equalTo().limitToLast(1);</code> (none of which looks good enough to even bother sharing...) which didn't work. I have one extremely dirty and hacks solution currently that'll break if I add one more value to the second deepest part of the tree (using <code>for</code> and <code>.length - 3</code>) is there a way to do this cleaner? </p>