title: Update ONLY some fields of an object in IndexedDB
body: <p>For example:</p>
  
  <p><code>object1(1) = {
    name: 'Rhodok Sergeant',
    speciality: 'Hand to hand battle'
  }</code></p>
  
  <p>then I want to update only the <strong>speciality</strong> field, into:</p>
  
  <p><code>object1(1) = {
    name: 'Rhodok Sergeant',
    speciality: 'Long range battle'
  }</code></p>
  
  <p>Thank you.</p>