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POSencha: Iterating a list store of a custom BaseModel subclass
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  1. POSencha: Iterating a list store of a custom BaseModel subclass
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    copied!<p>I just started playing with Sencha's Ext GWT yesterday and I've hit a wall. I combined methods from their JSON loaded grid and their editable grid. As a test data set I'm using a list of Stargate Atlantis episodes hence the SGAEpisode which is defined as:</p> <pre><code>public class SGAEpisode extends BaseModel { public SGAEpisode() { } public SGAEpisode(String season, String episode) { set("season",season); set("episode",episode); } public void setSeason(String season) { set("season",season); } public String getSeason(){ return get("season"); } public void setEpisode(String name) { set("episode",name); } public String getEpisode() { return get("episode"); } public String toString() { return "Season: " + get("season") + " episode: " + get("episode"); } } </code></pre> <p>the onModuleLoad() starts off with...</p> <pre><code>ModelType type = new ModelType(); type.setRoot("seasons"); type.addField("Season","season"); type.addField("Episode","episode"); String path = GWT.getHostPageBaseURL() + "senchaapp/sgaepisodes"; final RequestBuilder builder = new RequestBuilder(RequestBuilder.GET,path); final MVProxy&lt;String&gt; proxy = new SProxy&lt;String&gt;(builder); JsonLoadResultReader&lt;ListLoadResult&lt;SGAEpisode&gt;&gt; reader = new JsonLoadResultReader&lt;ListLoadResult&lt;SGAEpisode&gt;&gt;(type); final BaseListLoader&lt;ListLoadResult&lt;SGAEpisode&gt;&gt; loader = new BaseListLoader&lt;ListLoadResult&lt;SGAEpisode&gt;&gt;(proxy,reader); final ListStore&lt;SGAEpisode&gt; episodes = new ListStore&lt;SGAEpisode&gt;(loader); </code></pre> <p>so loader.load() works great, populating a grid, I can edit fields, but I don't see commitChanges() doing anything and I can't iterate over the ListStore "episodes" to gather changed or added values. Oh, and SProxy is just a DataProxy subclass to allow me to specify the season's JSON I'm loading into the grid.</p> <p>If I try either </p> <pre><code>for(SGAEpisode episode : episodes) { save(episode); } </code></pre> <p>or </p> <pre><code>for(int i = 0; i &lt; episodes.getCount(); i++) { save(episodes.getAt(i)); } </code></pre> <p>I get an exception with the message "com.extjs.gxt.ui.client.data.BaseModel cannot be cast to com.mvsc.sencha.shared.SGAEpisode" Any idea what I'm doing wrong? Everything up to that point was defined/populated with SGAEpisodes.....</p> <p><em>Addendum</em> Ok, so if I try </p> <pre><code>List&lt;Record&gt; modified = episodes.getModifiedRecords(); for(Record r : modified) { ModelData md = r.getModel(); save(md.get("season"),md.get("episode")); } </code></pre> <p>I can iterate, and get the modified values, but what's the point of having a ModelData subclass if I have to use the base class like this. Which makes me think I don't in fact have to..... little help?</p> <p><em>Addendum 2</em> I tried subclassing BaseModelData instead with no success.</p>
 

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