nietaki
2014-07-01 23:56:55
你可以按序列(String, JsValue)对的方式访问JSON对象的字段，并且可以对它们进行过滤。你可以过滤掉有值和无值的对象，并使用过滤后的序列构造新JsObject对象。
import play.api.libs.json._
val ls =
("field1", JsString("value1")) ::
("field2", JsString("")) ::
("field3", JsString("value3")) ::
("field4", JsString("")) ::
Nil
val js0 = new JsObject(ls)
def withoutValue(v: JsValue) = v match {
case JsNull => true
case JsString("") => true
case _ => false
}
val js1 = JsObject(js0.fields.filterNot(t => withoutValue(t._2)))
val js2 = JsObject(js0.fields.filter(t => withoutValue(t._2)))
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