title: EXTJS 5 Load a VERY SIMPLE string array in store
body: <p>I have a back end service that gives me an object which only contains an array of string.
  This is for example what the service gives me:</p>
  
  <pre><code>{  
    "DepartementsResult": [
      "AME-CM",
      "BMAU",
      "BMKR",
      "BNVS"
    ]
  }
  </code></pre>
  
  <p>So to get this data I want to create a nice and simple store, but a first problem appear: what should be the field???</p>
  
  <pre><code>var store = Ext.create('Ext.data.Store', {
      fields: ['data'], // What should be the fields here, I have none ^^"
      pageSize: 0,
      autoLoad: false,
      proxy: {
          type: 'ajax',
          url: 'data.json', // this file contains the data described above
          reader: {
              type: 'json',
              rootProperty: 'DepartementsResult'
          }
      }
  });
  </code></pre>
  
  <p>And then when I want to create a combo using this store I don't know what I should write also:</p>
  
  <pre><code>var combo = Ext.create('Ext.form.field.ComboBox', {
      store: store,
      displayField: 'data', // what field should be displayed ^^" ?
      valueField: 'data', // same here I don't really know what to write
      fieldLabel: 'Departements',
      renderTo: Ext.getBody()
  });
  </code></pre>
  
  <p>Here is the link <a href="https://fiddle.sencha.com/#fiddle/iau" rel="noreferrer">https://fiddle.sencha.com/#fiddle/iau</a> to the sencha fiddle with the code described bellow  ! Thanks a lot !!</p>