public <T extends ParseObject> ParseRelation<T> getRelation(String key) {
ParseRelation<T> relation = new ParseRelation<T>(this, key);
Object value = this.data.get(key);
if (value != null) {
if (value instanceof ParseRelation) {
relation.setTargetClass(((ParseRelation<?>) value).getTargetClass());
}
} else {
this.data.put(key, relation);
}
return relation;
}
