#NEWLINE# def get_field_relations( self , relation_collection , related_model_class , start_model = None , end_model = None ) : #NEWLINE# #INDENT# '\n        ' #NEWLINE# self . _is_working_on_relations = True #NEWLINE# self . _has_cache = False #NEWLINE# self . _relations_start_model = start_model #NEWLINE# self . _relations_end_model = end_model #NEWLINE# self . _relations_relation_collection = relation_collection #NEWLINE# self . _related_model_class = start_model #NEWLINE# return self