ActiveAndroid - Model inheritance

I test ActiveAndroid around and found an issue.

When creating a base super DO class that extends from Model class with some common properties/methods, then create some DOs extending from that base DO.

It turns the extended DOs to miss their properties.

Look into more detail, the problem is from the TableInfo.java

 public TableInfo(Class<? extends Model> type) {  
   mType = type;  
   final Table tableAnnotation = type.getAnnotation(Table.class);  
   if (tableAnnotation != null) {  
     mTableName = tableAnnotation.name();  
   }  
   else {  
     mTableName = type.getSimpleName();  
   }  
   List<Field> fields = new ArrayList<Field>(Arrays.asList(type.getDeclaredFields()));  
   fields.add(getIdField(type));  
   for (Field field : fields) {  
     if (field.isAnnotationPresent(Column.class)) {  
       final Column columnAnnotation = field.getAnnotation(Column.class);  
       mColumnNames.put(field, columnAnnotation.name());  
     }  
   }  
 }  
 private Field getIdField(Class<?> type) {  
   if (type.equals(Model.class)) {  
     try {  
       return type.getDeclaredField("mId");  
     }  
     catch (NoSuchFieldException e) {  
       Log.e("Impossible!", e);  
     }  
   }  
   else if (type.getSuperclass() != null) {  
     return getIdField(type.getSuperclass());  
   }  
   return null;  
 }  

The reason is the above red codes just get its properties but without including its super classes' properties.

So I created a new method getDeclaredFields to replace the getIdField as below:

 /**Get declared fields from the given class & it's ancestors  
  * @param type class  
  * @return  
  */  
 private List<Field> getDeclaredFields(Class<?> type) {  
   List<Field> fields = new ArrayList<Field>();  
   if (type.getSuperclass() != null && type.getSuperclass() != Object.class) {  
     fields.addAll(getDeclaredFields(type.getSuperclass()));  
   }  
   fields.addAll(Arrays.asList(type.getDeclaredFields()));  
   return fields;  
 }  

And replace red lines with:

 List<Field> fields = getDeclaredFields(type);