title: Putting many PropertyList's into Google App Engine datastore (in Go) and loading them again with Query.GetAll
body: <p>I am putting entities (as a <code>datastore.PropertyList</code>) into the datastore like this:</p>
  
  <pre><code>// save one
  var plist datastore.PropertyList = make(datastore.PropertyList, 3)
  plist = append(plist, datastore.Property { "name", "Mat", false, false })
  plist = append(plist, datastore.Property { "age", "29", false, false })
  plist = append(plist, datastore.Property { "location", "London", false, false })
  key := datastore.NewIncompleteKey(context, "Record", nil)
  datastore.Put(context, key, &amp;plist)
  
  // save another one
  var plist datastore.PropertyList = make(datastore.PropertyList, 3)
  plist = append(plist, datastore.Property { "name", "Laurie", false, false })
  plist = append(plist, datastore.Property { "age", "27", false, false })
  plist = append(plist, datastore.Property { "location", "London", false, false })
  key := datastore.NewIncompleteKey(context, "Record", nil)
  datastore.Put(context, key, &amp;plist)
  </code></pre>
  
  <p>That all works fine (although the code above is more like pseudo code for now).  I am able to load them individually, and the <code>datastore.PropertyList</code> comes out with each field as its own <code>datastore.Property</code>.</p>
  
  <p>However, when I try to retrieve many of them using a <code>Query</code>, it fails:</p>
  
  <pre><code>query := datastore.NewQuery("Record")
  
  plists := make(datastore.PropertyList, 0, 10)
  keys, err := query.GetAll(context, &amp;plists)
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>datastore: cannot load field "age" into a "datastore.Property": no such struct field
  </code></pre>
  
  <p>It seems that it doesn't complain about <code>Name</code> because that happens to be a valid property of <code>datastore.Property</code>, so how do I get it to load the items as intended, with each item in <code>plists</code> being a <code>datastore.PropertyList</code> instead of <code>datastore.Property</code>?</p>