in jbi/models.py [0:0]
def append_responses(self, *responses):
"""Shortcut function to add responses to the existing list."""
if not self.current_step:
raise ValueError("`current_step` unset in context.")
copied = copy(self.responses_by_step)
copied[self.current_step].extend(responses)
return self.update(responses_by_step=copied)