title: How to POST/PUT on a Map<String,Entity> collection association
body: <p>Maybe a dumb question but how to update the content of a typed Map <code>collection association</code> of an exposed entity with <code>Spring Data Rest</code> using POST/PUT requests ? </p>
  
  <p>I know how to POST/PUT on List or Set associations using <code>Content-Type: text/uri-list</code> but i don't with key/value Map&lt;> </p>
  
  <p><strong>EDIT</strong></p>
  
  <p>I tried to send a ressource URI on the body of a PUT request with <code>Content-Type: text/uri-list</code> on the association endpoint. I gave no error, but it replaced all the previous content of the Map&lt;> by this :</p>
  
  <pre><code>{ 
     self: { ENTITY content} 
  } 
  </code></pre>
  
  <p>So it seems to be supported (a side effect ?). It named the key <code>self</code>. 
  I don't know how to specify the key. </p>