Panic with customizer and embedded structs (#434)

Author: peterbroadhurst

openapi3gen/openapi3gen.go

@@ -103,6 +103,16 @@ func (g *Generator) generateSchemaRefFor(parents []*jsoninfo.TypeInfo, t reflect
 	return ref, err
 }
 
+func getStructField(t reflect.Type, fieldInfo jsoninfo.FieldInfo) reflect.StructField {
+	var ff reflect.StructField
+	// fieldInfo.Index is an array of indexes starting from the root of the type
+	for i := 0; i < len(fieldInfo.Index); i++ {
+		ff = t.Field(fieldInfo.Index[i])
+		t = ff.Type
+	}
+	return ff
+}
+
 func (g *Generator) generateWithoutSaving(parents []*jsoninfo.TypeInfo, t reflect.Type, name string, tag reflect.StructTag) (*openapi3.SchemaRef, error) {
 	typeInfo := jsoninfo.GetTypeInfo(t)
 	for _, parent := range parents {
@@ -266,7 +276,7 @@ func (g *Generator) generateWithoutSaving(parents []*jsoninfo.TypeInfo, t reflec
 							schema.WithPropertyRef(fieldName, ref)
 						}
 					} else {
-						ff := t.Field(fieldInfo.Index[len(fieldInfo.Index)-1])
+						ff := getStructField(t, fieldInfo)
 						if tag, ok := ff.Tag.Lookup("yaml"); ok && tag != "-" {
 							fieldName, fType = tag, ff.Type
 						}
@@ -276,7 +286,7 @@ func (g *Generator) generateWithoutSaving(parents []*jsoninfo.TypeInfo, t reflec
 				// extract the field tag if we have a customizer
 				var fieldTag reflect.StructTag
 				if g.opts.schemaCustomizer != nil {
-					ff := t.Field(fieldInfo.Index[len(fieldInfo.Index)-1])
+					ff := getStructField(t, fieldInfo)
 					fieldTag = ff.Tag
 				}
 

openapi3gen/openapi3gen_test.go

@@ -150,13 +150,23 @@ func TestCyclicReferences(t *testing.T) {
 }
 
 func TestSchemaCustomizer(t *testing.T) {
-	type Bla struct {
+	type NestedInnerBla struct {
+		Enum1Field string `json:"enum1" myenumtag:"a,b"`
+	}
+
+	type InnerBla struct {
 		UntaggedStringField string
 		AnonStruct          struct {
 			InnerFieldWithoutTag int
 			InnerFieldWithTag    int `mymintag:"-1" mymaxtag:"50"`
+			NestedInnerBla
 		}
-		EnumField string `json:"another" myenumtag:"a,b"`
+		Enum2Field string `json:"enum2" myenumtag:"c,d"`
+	}
+
+	type Bla struct {
+		InnerBla
+		EnumField3 string `json:"enum3" myenumtag:"e,f"`
 	}
 
 	schemaRef, _, err := NewSchemaRefForValue(&Bla{}, UseAllExportedFields(), SchemaCustomizer(func(name string, ft reflect.Type, tag reflect.StructTag, schema *openapi3.Schema) error {
@@ -196,17 +206,31 @@ func TestSchemaCustomizer(t *testing.T) {
         },
         "InnerFieldWithoutTag": {
           "type": "integer"
-        }
+        },
+				"enum1": {
+					"enum": [
+						"a",
+						"b"
+					],
+					"type": "string"
+				}
       },
       "type": "object"
     },
     "UntaggedStringField": {
       "type": "string"
     },
-    "another": {
+    "enum2": {
+      "enum": [
+        "c",
+        "d"
+      ],
+      "type": "string"
+    },
+    "enum3": {
       "enum": [
-        "a",
-        "b"
+        "e",
+        "f"
       ],
       "type": "string"
     }