fix(go): reserve JSON union methods (#3508)

Author: schani

packages/quicktype-core/src/language/Golang/GolangRenderer.ts

@@ -58,6 +58,16 @@ export class GoRenderer extends ConvenienceRenderer {
         return namingFunction;
     }
 
+    protected forbiddenForUnionMembers() {
+        return {
+            names:
+                this._options.justTypes || this._options.justTypesAndPackage
+                    ? []
+                    : ["MarshalJSON", "UnmarshalJSON"],
+            includeGlobalForbidden: false,
+        };
+    }
+
     protected makeEnumCaseNamer(): Namer {
         return namingFunction;
     }

test/inputs/json/priority/keywords.json

@@ -187,6 +187,7 @@
       "lock": { "lock": 123 },
       "long": { "long": 123 },
       "map": { "map": 123 },
+      "MarshalJSON": { "MarshalJSON": 123 },
       "MapEntry": { "MapEntry": 123 },
       "metadata_property_handling": { "metadata_property_handling": 123 },
       "module": { "module": 123 },
@@ -329,6 +330,7 @@
       "unchecked": { "unchecked": 123 },
       "undefined": { "undefined": 123 },
       "union": { "union": 123 },
+      "UnmarshalJSON": { "UnmarshalJSON": 123 },
       "UseSerializers": { "UseSerializers": 123 },
       "unowned": { "unowned": 123 },
       "unsafe": { "unsafe": 123 },

test/inputs/schema/keyword-enum.schema

@@ -185,6 +185,7 @@
         "lock",
         "long",
         "map",
+        "MarshalJSON",
         "MapEntry",
         "metadata_property_handling",
         "module",
@@ -321,6 +322,7 @@
         "unchecked",
         "undefined",
         "union",
+        "UnmarshalJSON",
         "UseSerializers",
         "unowned",
         "unsafe",

test/inputs/schema/keyword-unions.schema

@@ -1268,6 +1268,13 @@
             ],
             "title": "union_map"
         },
+        "MarshalJSON": {
+            "oneOf": [
+                { "type": "number" },
+                { "type": "object", "additionalProperties": false, "title": "MarshalJSON" }
+            ],
+            "title": "union_MarshalJSON"
+        },
         "MapEntry": {
             "oneOf": [
                 { "type": "number" },
@@ -2220,6 +2227,13 @@
             ],
             "title": "union_union"
         },
+        "UnmarshalJSON": {
+            "oneOf": [
+                { "type": "number" },
+                { "type": "object", "additionalProperties": false, "title": "UnmarshalJSON" }
+            ],
+            "title": "union_UnmarshalJSON"
+        },
         "UseSerializers": {
             "oneOf": [
                 { "type": "number" },

test/keywords.txt

@@ -179,6 +179,7 @@ Locale
 lock
 long
 map
+MarshalJSON
 MapEntry
 metadata_property_handling
 module
@@ -315,6 +316,7 @@ ulong
 unchecked
 undefined
 union
+UnmarshalJSON
 UseSerializers
 unowned
 unsafe