add support to convert Map[String, Seq[String]] to data map

Author: tminglei

integrations/playframework/SampleController.scala

@@ -2,12 +2,16 @@ import play.api.mvc._
 import com.github.tminglei.bind.simple._
 
 object SampleController extends Controller with MyFormBindSupport {
+  ///--
+  import scala.collection.convert.WrapAsScala._
+  def parameterMap(request: HttpServletRequest) = request.getParameterMap.map { case (key, values) => (key, values.toSeq) }.toMap
+  ///--
 
   def find() = Action { implicit request =>
     val mappings = tmapping(
       "cond" -> text()
     )
-    binder.bind(mappings, params).fold(
+    binder.bind(mappings, data(parameterMap(request))).fold(
       errors => status(400, errors),
       { case (cond) =>
         ok(repos.features.find(cond))

integrations/scalatra/SampleServlet.scala

@@ -7,7 +7,7 @@ class SampleServlet extends ScalatraServlet with MyFormBindSupport {
     val mappings = tmapping(
       "id" -> long()
     )
-    binder.bind(mappings, params).fold(
+    binder.bind(mappings, data(multiParams)).fold(
       errors => holt(400, errors),
       { case (id) =>
         Ok(toJson(repos.features.get(id)))

src/main/scala/com/github/tminglei/bind/package.scala

@@ -29,5 +29,19 @@ package object bind {
   object simple extends Mappings with Constraints with Processors {
     type FormBinder[R] = com.github.tminglei.bind.FormBinder[R]
     val  FormBinder = com.github.tminglei.bind.FormBinder
+
+    ///--
+    def data(params: Map[String, Seq[String]]): Map[String, String] = {
+      params.map { case (key, values) =>
+        if (values == null || values.length == 0) Nil
+        else if (values.length == 1 && ! key.endsWith("[]")) Seq((key, values(0)))
+        else {
+          for(i <- 0 until values.length) yield {
+            val cleanKey = key.replaceAll("\\[\\]$", "")
+            (s"$cleanKey[$i]", values(i))
+          }
+        }
+      }.flatten.toMap
+    }
   }
 }