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POHow to reference scala Enumeration from other package
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  1. POHow to reference scala Enumeration from other package
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    copied!<p>I'm having trouble understanding why I can't reference a scala enum type.</p> <p>The problem is that sometimes I can reference enums:</p> <pre><code>enum(UserStatus) </code></pre> <p>and sometimes it complains about not being able to find the enum</p> <pre><code>not found: type UserStatus </code></pre> <p>How come I sometimes cannot reference the Enumeration class?</p> <p>The generated source for the enum seems to be ok, and it works great with another enum that I have which lives in the same place, same usage...</p> <p>Any Suggestions?</p> <h1>More info</h1> <p>The generated source for the enum is:</p> <pre><code>public final class models.UserStatus extends java.lang.Object{ public static final scala.Enumeration$Value Busy(); public static final scala.Enumeration$Value Free(); public static final scala.Enumeration$ValueSet$ ValueSet(); public static final scala.Enumeration$Value withName(java.lang.String); public static final scala.Enumeration$Value apply(int); public static final int maxId(); public static final scala.Enumeration$ValueSet values(); public static final java.lang.String toString(); } </code></pre> <p>I'm trying to implement an enum mapper for play framework 2.0</p> <pre><code>def enumFormat[E &lt;: Enumeration](enum: E): Formatter[E#Value] = new Formatter[E#Value] { def bind(key: String, data: Map[String, String]) = { Formats.stringFormat.bind(key, data).right.flatMap { s =&gt; scala.util.control.Exception.allCatch[E#Value] .either(enum.withName(s)) .left.map(e =&gt; Seq(FormError(key, "error.enum", Nil))) } } def unbind(key: String, value: E#Value) = Map(key -&gt; value.toString) } </code></pre> <p>And this method that calls the mapper</p> <pre><code>def enum[E &lt;: Enumeration](enum: E): Mapping[E#Value] = of(enumFormat(enum)) </code></pre> <p>This means that the mapper automatically converts between a enum when using the form binding</p> <p>Pseudo code of usage.</p> <pre><code>package models { object UserStatus extends Enumeration { val Free = Value("free") val Busy = Value("busy") } case class User( status: UserStatus.Value = UserStatus.Free ) } package controllers { imports models._ val userForm = Form( mapping( "status" -&gt; enum(UserStatus) )(User.apply)(User.unapply) ) } </code></pre>
 

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