fix: json template render bad empty array and empty object (#644)

Signed-off-by: James Yean <ywhjames@hotmail.com>
vanus-labs · Nov 5, 2023 · 00d9a94 · 00d9a94
1 parent 3267c49
commit 00d9a94
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Showing 2 changed files with 20 additions and 8 deletions.
diff --git a/pkg/template/json/generator.go b/pkg/template/json/generator.go
@@ -79,15 +79,15 @@ func (g *templateGenerator) generate(root templateNode) []templateSegment {
 }
 
 func (g *templateGenerator) generateObjectNode(node *objectNode, i int) bool {
+	if i == 0 {
+		g.buf.WriteByte('{')
+	}
+
 	if i >= len(node.members) {
 		g.buf.WriteByte('}')
 		return false
 	}
 
-	if i == 0 {
-		g.buf.WriteByte('{')
-	}
-
 	mn := node.members[i]
 	switch n := mn.value.(type) {
 	case *jsonPathNode:
@@ -114,15 +114,15 @@ func (g *templateGenerator) generateObjectNode(node *objectNode, i int) bool {
 }
 
 func (g *templateGenerator) generateArrayNode(node *arrayNode, i int) bool {
+	if i == 0 {
+		g.buf.WriteByte('[')
+	}
+
 	if i >= len(node.elements) {
 		g.buf.WriteByte(']')
 		return false
 	}
 
-	if i == 0 {
-		g.buf.WriteByte('[')
-	}
-
 	en := node.elements[i]
 	switch n := en.(type) {
 	case *jsonPathNode:

diff --git a/pkg/template/json/template_test.go b/pkg/template/json/template_test.go
@@ -27,6 +27,18 @@ import (
 )
 
 func TestTemplate_Execute(t *testing.T) {
+	Convey("empty array and empty object", t, func() {
+		model := map[string]interface{}{}
+		variables := map[string]interface{}{}
+
+		tp, err := Compile(`[{"empty array":[],"empty object":{}}]`)
+		So(err, ShouldBeNil)
+
+		v, err := tp.Execute(model, variables)
+		So(err, ShouldBeNil)
+		So(string(v), ShouldEqual, `[{"empty array":[],"empty object":{}}]`)
+	})
+
 	Convey("refer variables", t, func() {
 		model := map[string]interface{}{}
 		variables := map[string]interface{}{}