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POHow to bind Double parameter with Play 2.0 routing
 

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  1. POHow to bind Double parameter with Play 2.0 routing
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    <p>I'm learning myself Play 2.0 (Java API used) and would like to have a double/float parameter (for location coordinates), something like <a href="http://myfooapp.com/events/find?latitude=25.123456&amp;longitude=60.251253" rel="noreferrer">http://myfooapp.com/events/find?latitude=25.123456&amp;longitude=60.251253</a>.</p> <p>I can do this by getting the parameters as String and parsing them at controller etc but can I use automatic binding here?</p> <p>Now, I first tried simply having one double value:</p> <pre><code>GET /events/foo controllers.Application.foo(doublevalue: Double) </code></pre> <p>with</p> <pre><code>public static Result foo(Double doublevalue) { return ok(index.render("Foo:" + doublevalue)); } </code></pre> <p>What I got was <em>"No QueryString binder found for type Double. Try to implement an implicit QueryStringBindable for this type."</em></p> <p>Have I missed something already provided or do I have to make a custom QueryStringBindable that parses Double? </p> <p>I found some instructions on making a custom string query string binder with Scala at <a href="http://julien.richard-foy.fr/blog/2012/04/09/how-to-implement-a-custom-pathbindable-with-play-2/" rel="noreferrer">http://julien.richard-foy.fr/blog/2012/04/09/how-to-implement-a-custom-pathbindable-with-play-2/</a></p> <h2>What I tried:</h2> <p>I implemented DoubleBinder at package binders:</p> <pre><code>import java.util.Map; import play.libs.F.Option; import play.mvc.QueryStringBindable; public class DoubleBinder implements QueryStringBindable&lt;Double&gt;{ @Override public Option&lt;Double&gt; bind(String key, Map&lt;String, String[]&gt; data) { String[] value = data.get(key); if(value == null || value.length == 0) { return Option.None(); } else { return Option.Some(Double.parseDouble(value[0])); } } @Override public String javascriptUnbind() { // TODO Auto-generated method stub return null; } @Override public String unbind(String key) { // TODO Auto-generated method stub return null; } } </code></pre> <p>And tried to add it to project/Build.scala's main:</p> <pre><code>routesImport += "binders._" </code></pre> <p>but same result : "No QueryString binder found for type Double...."</p> <ul> <li>I also changed the routing signature to java.lang.Double but that didn't help either</li> <li>I also changed the DoubleBinder to implement play.api.mvc.QueryStringBindable (instead of play.mvc.QueryStringBindable) both with Double &amp; java.lang.Double at the routing signature but no help still</li> </ul>
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    1. COI think that’s a bug in the support of Java `QueryStringBindable`. Please file a ticket in the [tracker](https://play.lighthouseapp.com/projects/82401-play-20/overview). BTW, `Double` and `Float` should be supported out of the box in Play 2.1.
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      1. USJulien Richard-Foy
    2. COThere seems to be a pull request for it on github https://github.com/playframework/Play20/pull/235
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      1. USLeon Radley
    3. COOk, I found the problem source and a solution. See my answer below :)
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