def get_messages():
chat_id = request.form['chat_id']
if not chat_model.can_write(chat_id):
abort(400)
try:
last_msg_id = int(request.form['letter_id'])
except ValueError:
abort(400)
letters = sorted(chat_model.get_messages(chat_id),
key=lambda x: x.create_time)
ans = [{
'id': msg.id,
'text': msg.text,
'is_business': msg.is_business
} for msg in letters if msg.id > last_msg_id]
chat_model.see_all(chat_id,
is_business=(not bool(session.get('id', False))))
return jsonify(new_messages=ans)
