Update the _examples/mvc/login example - add a Path property at mvc.Response and add a context.Proceed helper function

Former-commit-id: b898901fe4a324e888a6e09c93530cf7a551cf2a

mvc/activator/activator.go

@@ -57,6 +57,11 @@ var (
 // which the main request `Controller` will implement automatically.
 // End-User doesn't need to have any knowledge of this if she/he doesn't want to implement
 // a new Controller type.
+// Controller looks the whole flow as one handler, so `ctx.Next`
+// inside `BeginRequest` is not be respected.
+// Alternative way to check if a middleware was procceed succesfully
+// and called its `ctx.Next` is the `ctx.Proceed(handler) bool`.
+// You have to navigate to the `context/context#Proceed` function's documentation.
 type BaseController interface {
 	SetName(name string)
 	BeginRequest(ctx context.Context)

mvc/method_result_response.go

@@ -21,6 +21,13 @@ type Response struct {
 	// "ContentType" if not empty.
 	Object interface{}
 
+	// If Path is not empty then it will redirect
+	// the client to this Path, if Code is >= 300 and < 400
+	// then it will use that Code to do the redirection, otherwise
+	// StatusFound(302) or StatusSeeOther(303) for post methods will be used.
+	// Except when err != nil.
+	Path string
+
 	// if not empty then fire a 400 bad request error
 	// unless the Status is > 200, then fire that error code
 	// with the Err.Error() string as its content.
@@ -29,12 +36,31 @@ type Response struct {
 	// if any otherwise the framework sends the default http error text based on the status.
 	Err error
 	Try func() int
+
+	// if true then it skips everything else and it throws a 404 not found error.
+	// Can be named as Failure but NotFound is more precise name in order
+	// to be visible that it's different than the `Err`
+	// because it throws a 404 not found instead of a 400 bad request.
+	// NotFound bool
+	// let's don't add this yet, it has its dangerous of missuse.
 }
 
 var _ methodfunc.Result = Response{}
 
 // Dispatch writes the response result to the context's response writer.
 func (r Response) Dispatch(ctx context.Context) {
+	if r.Path != "" && r.Err == nil {
+		// it's not a redirect valid status
+		if r.Code < 300 || r.Code >= 400 {
+			if ctx.Method() == "POST" {
+				r.Code = 303 // StatusSeeOther
+			}
+			r.Code = 302 // StatusFound
+		}
+		ctx.Redirect(r.Path, r.Code)
+		return
+	}
+
 	if s := r.Text; s != "" {
 		r.Content = []byte(s)
 	}

mvc/method_result_view.go

@@ -36,9 +36,14 @@ const dotB = byte('.')
 var DefaultViewExt = ".html"
 
 func ensureExt(s string) string {
+	if len(s) == 0 {
+		return "index.html"
+	}
+
 	if strings.IndexByte(s, dotB) < 1 {
 		s += DefaultViewExt
 	}
+
 	return s
 }