make non-matching types in arrays type "any"

Author: grische

json-to-go.js

@@ -102,7 +102,16 @@ function jsonToGo(json, typename, flatten = true, example = false, allOmitempty
 								const existingValue = allFields[keyname].value;
 								const currentValue = scope[i][keyname];
 
-								if (compareObjects(existingValue, currentValue)) {
+								if (!areSameType(existingValue, currentValue)) {
+									if(existingValue !== null) {
+										allFields[keyname].value = null // force type "any" if types are not identical
+										console.warn(`Warning: key "${keyname}" uses multiple types. Defaulting to type "any".`)
+									}
+									allFields[keyname].count++
+									continue
+								}
+
+								if (areObjects(existingValue, currentValue)) {
 									const comparisonResult = compareObjectKeys(
 										Object.keys(currentValue),
 										Object.keys(existingValue)
@@ -444,12 +453,19 @@ function jsonToGo(json, typename, flatten = true, example = false, allOmitempty
 		return unique
 	}
 
-	function compareObjects(objectA, objectB) {
+	function areObjects(objectA, objectB) {
 		const object = "[object Object]";
 		return Object.prototype.toString.call(objectA) === object
 			&& Object.prototype.toString.call(objectB) === object;
 	}
 
+	function areSameType(objectA, objectB) {
+		// prototype.toString required to compare Arrays and Objects
+		const typeA =  Object.prototype.toString.call(objectA)
+		const typeB = Object.prototype.toString.call(objectB)
+		return typeA === typeB
+	}
+
 	function compareObjectKeys(itemAKeys, itemBKeys) {
 		const lengthA = itemAKeys.length;
 		const lengthB = itemBKeys.length;

json-to-go.test.js

@@ -162,6 +162,7 @@ function testFiles() {
   const testCases = [
     "duplicate-top-level-structs",
     "double-nested-objects",
+    "array-with-nonmatching-types",
   ];
 
   for (const testCase of testCases) {

tests/array-with-nonmatching-types.go

@@ -0,0 +1,10 @@
+type AutoGenerated struct {
+	Booleanfield bool `json:"booleanfield"`
+	Somearray []Somearray `json:"somearray"`
+	Date string `json:"date"`
+}
+type Somearray struct {
+	ID any `json:"id"`
+	Name string `json:"name"`
+	Features any `json:"features"`
+}

tests/array-with-nonmatching-types.json

@@ -0,0 +1,23 @@
+{
+	"booleanfield": true,
+	"somearray": [
+		{
+			"id": 1,
+			"name": "John Doe",
+			"features": {
+				"age": 49,
+				"height": 175
+			}
+		},
+		{
+			"id": "2",
+			"name": "John Doe",
+			"features": [
+				"2",
+                "3",
+				"4"
+			]
+		}
+	],
+	"date": "2024-07-24"
+}