title: How to remove values in firebase
body: <p>Just a little question : <br />
  Now i have this structure <br /></p>
  
  <pre><code>images
  ---- uniqueId
  -------- id_logement : 1747657
  -------- image : dataimage
  ---- uniqueId
  -------- id_logement : 1747657
  -------- image : dataimage
  ---- uniqueId
  -------- id_logement : 985445234
  -------- image : dataimage
  </code></pre>
  
  <p>And it's better ! Thank you !! but :<br/>
  How can i remove all the images where id_logement = 1747657 ?<br />
  i tried that </p>
  
  <pre><code>        firebase.database().ref('logements/'+key).remove();
          firebase.database().ref('geofire/'+key).remove();
          firebase.database().ref('images').child('id_logement').equalTo(key).remove();
  </code></pre>
  
  <p>with key = 1747657 but without success for the images ! This UniqueId makes me nervous ! Please can you send me more advices ? thank you very much</p>