use full match instead of strings.HasPrefix

via: gorilla#178

decoder.go

@@ -252,7 +252,17 @@ func isEmptyFields(fields []fieldWithPrefix, src map[string][]string) bool {
 				return false
 			}
 			for key := range src {
-				if !isEmpty(f.typ, src[key]) && strings.HasPrefix(key, path) {
+				nested := strings.IndexByte(key, '.') != -1
+
+				// for non required nested structs
+				c1 := strings.HasSuffix(f.prefix, ".") && key == path
+
+				// for required nested structs
+				c2 := f.prefix == "" && nested && strings.HasPrefix(key, path)
+
+				// for non nested fields
+				c3 := f.prefix == "" && !nested && key == path
+				if !isEmpty(f.typ, src[key]) && (c1 || c2 || c3) {
 					return false
 				}
 			}

decoder_test.go

@@ -1604,6 +1604,23 @@ func TestRequiredStructFiled(t *testing.T) {
 	}
 }
 
+type Node struct {
+	Value int   `schema:"val,required"`
+	Next  *Node `schema:"next,required"`
+}
+
+func TestRecursiveStruct(t *testing.T) {
+	v := map[string][]string{
+		"val":      {"1"},
+		"next.val": {"2"},
+	}
+	var a Node
+	err := NewDecoder().Decode(&a, v)
+	if err != nil {
+		t.Errorf("error: %v", err)
+	}
+}
+
 func TestRequiredFieldIsMissingCorrectError(t *testing.T) {
 	type RM1S struct {
 		A string `schema:"rm1aa,required"`