title: SAPUI5: Get row by key from JSON Model
body: <p>I have the following model. 
  Now I want to select one row in a function with a specific condition.</p>
  
  <p>model.json</p>
  
  <pre><code>{
      "collection": [
          {
          "nr": "99990655",
          "machine": "Test A"
          },
          {
          "nr": "123435546",
          "machine": "Test B"
          }
          ]
  }
  </code></pre>
  
  <p>I successfully get the first row with the following command:
  <code>this.getView().getModel("machinemodel").getProperty("/collection/0")</code></p>
  
  <p>Now I want the row where nr is '123435546'.</p>
  
  <p><code>this.getView().getModel("machinemodel").getProperty("/collection(nr='123435546')")</code> is not working.</p>