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POHow to submit a list of Objects in Play Framework
 

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  1. POHow to submit a list of Objects in Play Framework
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    <p>Here my test setup: </p> <p><strong>The Model:</strong></p> <pre><code>package models; import javax.persistence.Entity; import play.db.jpa.Model; @Entity public class Item extends Model { public String propertyA; public String propertyB; public String getFullName() { return this.propertyA + " - " + this.propertyB; } } </code></pre> <p><strong>The Controller:</strong></p> <pre><code>package controllers; import play.*; import play.mvc.*; import java.util.*; import models.*; public class Application extends Controller { public static void index() { List&lt;Item&gt; allItems = Item.findAll(); render(allItems); } public static void save(List&lt;Item&gt; items) { if (items == null) { Logger.info("no items"); } else { for (Item item : items) { Logger.info("item: %s",item); } Logger.info("-------"); } index(); } } </code></pre> <p><strong>The view:</strong></p> <pre><code>#{extends 'main.html' /} #{set title:'Home' /} #{form @Application.save()} Select Items: &lt;div&gt; &lt;select name="items" style="width: 200px;" multiple="multiple" size="10"&gt; #{list items:allItems, as: 'item'} &lt;option value=${item.id} &gt;${item.fullName}&lt;/option&gt; #{/list} &lt;/select&gt; &lt;/div&gt; &lt;input type="submit" value="Save" /&gt; #{/form} </code></pre> <p>When I select two Items in the Select box, I get the following Log output:</p> <pre><code>06:22:20,560 INFO ~ ------- 06:22:26,991 INFO ~ item: null 06:22:26,991 INFO ~ item: null </code></pre> <p>It looks like play maps the selection to a List of <code>null</code> objects. Even when I change the view to:</p> <pre><code>&lt;option value=${item} &gt;${item.fullName}&lt;/option&gt; </code></pre> <p>I get <code>null</code> values.</p> <p>But when I change the controller to:</p> <pre><code>public static void save(List&lt;Long&gt; items) { ... } </code></pre> <p>I at least get a List of correct Ids.</p> <p>How can I change this, so that play creates the correct mapping for my items. I prefer to get <code>List&lt;Item&gt;</code> instead of <code>List&lt;Long&gt;</code> (here I have to perform queries to geht the List of Items).</p> <p>BR, Rene</p> <p><strong>Update:</strong></p> <p>If I run:</p> <pre><code>curl -d "items[0].id=3&amp;items[0].propertyA=bla&amp;items[0].propertyB=blo&amp;items[1].id=4" http://localhost:9000/application/save </code></pre> <p>Wich does a POST with the above parameters, I get:</p> <pre><code>A02:39:53,072 INFO ~ item: bla - blo 02:39:53,072 INFO ~ item: null - null 02:39:53,072 INFO ~ ------- </code></pre> <p>Like this it works, but I do not see how I could change the view, so that it posts the above parameters :-(</p> <p><strong>Update 2:</strong></p> <p>With the help from Felipe I got it to work. This Controller Method has to be added:</p> <pre><code>@Before(only = {"save"}) static void parseParams() { String[] items = params.getAll("items"); params.remove("items"); for (int i = 0; i &lt; items.length; i++) { Item item = Item.findById(Long.parseLong(items[i])); params.put("items[" + i + "].id", items[i]); params.put("items[" + i + "].propertyA", item.propertyA); params.put("items[" + i + "].propertyB", item.propertyB); } } </code></pre>
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