include child in all its super types

Author: szakrewsky

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java

@@ -183,13 +183,14 @@ public Map<String, Object> postProcessAllModels(Map<String, Object> objs) {
             // Let parent know about all its children
             for (String name : allModels.keySet()) {
                 CodegenModel cm = allModels.get(name);
-                if (cm.parent == null) continue;
                 CodegenModel parent = allModels.get(cm.parent);
-                if (parent == null) continue;
-                if (parent.children == null) {
-                    parent.children = new ArrayList<CodegenModel>();
+                while (parent != null) {
+                    if (parent.children == null) {
+                        parent.children = new ArrayList<CodegenModel>();
+                    }
+                    parent.children.add(cm);
+                    parent = allModels.get(parent.parent);
                 }
-                parent.children.add(cm);
             }
         }
         return objs;