From 2cf2684f695c4d771c778596c1c1f7bb22ef844e Mon Sep 17 00:00:00 2001
From: Kosuke Ohmura <bnpb81@gmail.com>
Date: Wed, 15 Mar 2017 16:56:11 +0900
Subject: [PATCH] Support array-ish query parameter convention

---
 .../APIKit/Serializations/URLEncodedSerialization.swift   | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Sources/APIKit/Serializations/URLEncodedSerialization.swift b/Sources/APIKit/Serializations/URLEncodedSerialization.swift
index cb996b39..786d2dae 100644
--- a/Sources/APIKit/Serializations/URLEncodedSerialization.swift
+++ b/Sources/APIKit/Serializations/URLEncodedSerialization.swift
@@ -93,6 +93,14 @@ public final class URLEncodedSerialization {
             if value is NSNull {
                 return "\(escape(key))"
             }
+            
+            if let valueAsArray = value as? Array<Any> {
+                let escapedKeyForArray = escape(key + "[]")
+                return valueAsArray.map { (element: Any) -> String in
+                    let elementAsString = (element as? String) ?? "\(element)"
+                    return "\(escapedKeyForArray)=\(escape(elementAsString))"
+                    }.joined(separator: "&")
+            }
 
             let valueAsString = (value as? String) ?? "\(value)"
             return "\(escape(key))=\(escape(valueAsString))"