Update to version 8.5.1. It contains a minor fix. Read HISTORY.md

https://github.com/kataras/iris/blob/master/HISTORY.md#tu-10-october-2017--v851

Former-commit-id: af1424c691613ccde911bef7d1371aa52e6abb79

mvc/method_result_test.go

@@ -222,3 +222,50 @@ func TestControllerMethodResultTypes(t *testing.T) {
 		// it will fire the error's text
 		Body().Equal("omit return of testCustomStruct and fire error")
 }
+
+type testControllerViewResultRespectCtxViewData struct {
+	T *testing.T
+	mvc.C
+}
+
+func (t *testControllerViewResultRespectCtxViewData) BeginRequest(ctx context.Context) {
+	t.C.BeginRequest(ctx)
+	ctx.ViewData("name_begin", "iris_begin")
+}
+
+func (t *testControllerViewResultRespectCtxViewData) EndRequest(ctx context.Context) {
+	t.C.EndRequest(ctx)
+	// check if data is not overriden by return mvc.View {Data: context.Map...}
+
+	dataWritten := ctx.GetViewData()
+	if dataWritten == nil {
+		t.T.Fatalf("view data is nil, both BeginRequest and Get failed to write the data")
+		return
+	}
+
+	if dataWritten["name_begin"] == nil {
+		t.T.Fatalf(`view data[name_begin] is nil, 
+			BeginRequest's ctx.ViewData call have been overriden  by Get's return mvc.View {Data: }.
+			Total view data: %v`, dataWritten)
+	}
+
+	if dataWritten["name"] == nil {
+		t.T.Fatalf("view data[name] is nil, Get's return mvc.View {Data: } didn't work. Total view data: %v", dataWritten)
+	}
+}
+
+func (t *testControllerViewResultRespectCtxViewData) Get() mvc.Result {
+	return mvc.View{
+		Name: "doesnt_exists.html",
+		Data: context.Map{"name": "iris"}, // we care about this only.
+		Code: iris.StatusInternalServerError,
+	}
+}
+
+func TestControllerViewResultRespectCtxViewData(t *testing.T) {
+	app := iris.New()
+	app.Controller("/", new(testControllerViewResultRespectCtxViewData), t)
+	e := httptest.New(t, app)
+
+	e.GET("/").Expect().Status(iris.StatusInternalServerError)
+}