From 0c1ebbd786ff97e525025a1aaed59dd4d5b512ca Mon Sep 17 00:00:00 2001
From: Li Haoyi <haoyi.sg@gmail.com>
Date: Thu, 9 Aug 2018 00:39:48 +0800
Subject: Allow for optional query params

---
 cask/src/cask/endpoints/WebEndpoints.scala | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'cask/src')

diff --git a/cask/src/cask/endpoints/WebEndpoints.scala b/cask/src/cask/endpoints/WebEndpoints.scala
index 70d16e0..2125b4d 100644
--- a/cask/src/cask/endpoints/WebEndpoints.scala
+++ b/cask/src/cask/endpoints/WebEndpoints.scala
@@ -58,6 +58,12 @@ object QueryParamReader{
       v.map(x => implicitly[QueryParamReader[T]].read(ctx, label, Seq(x)))
     }
   }
+  implicit def OptionParam[T: QueryParamReader] = new QueryParamReader[Option[T]]{
+    def arity = 1
+    def read(ctx: cask.model.ParamContext, label: String, v: Seq[String]): Option[T] = {
+      v.headOption.map(x => implicitly[QueryParamReader[T]].read(ctx, label, Seq(x)))
+    }
+  }
   implicit def paramReader[T: ParamReader] = new QueryParamReader[T] {
     override def arity = 0
 
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