human
Solve the following python programming problem given the following code:
def get_related_objects(obj, using = DEFAULT_DB_ALIAS) : 
    collector = NestedObjects (using = flatten) 
    collector.collect ([obj]) 
    def flatten(elem) : 
        if isinstance (elem, list) : 
            return itertools.chain.from_iterable (map (flatten, elem)) 
else : 
            if (obj != elem) : 
                return (elem,) 
return () 
return flatten (collector.nested ()) 

    
    

    Fix the buggy line: collector = NestedObjects (using = flatten)
assistant
#Here is Python code to fix the buggy line: collector = NestedObjects (using = flatten)
.

collector = NestedObjects (using = using)