added the session to the current context and added a Session#GetOnce

method

Author: markbates

default_context.go

@@ -106,6 +106,7 @@ func (d *DefaultContext) Render(status int, rr render.Renderer) error {
 		}
 		data["params"] = pp
 		data["flash"] = d.Flash().data
+		data["session"] = d.Session()
 		bb := &bytes.Buffer{}
 
 		err := rr.Render(bb, data)

session.go

@@ -24,6 +24,15 @@ func (s *Session) Get(name interface{}) interface{} {
 	return s.Session.Values[name]
 }
 
+// GetOnce gets a value from the current session and then deletes it.
+func (s *Session) GetOnce(name interface{}) interface{} {
+	if x, ok := s.Session.Values[name]; ok {
+		s.Delete(name)
+		return x
+	}
+	return nil
+}
+
 // Set a value onto the current session. If a value with that name
 // already exists it will be overridden with the new value.
 func (s *Session) Set(name, value interface{}) {