def transaction_delete():
id_ = request.form.get('id')
t = Transaction.query_one({'_id': ObjectId(id_)})
# 做一次反向操作
if t.type_ == 'sell':
t.type_ = 'buy'
elif t.type_ == 'buy':
t.type_ = 'sell'
Position.do_op(t, reverse=True)
t.remove()
return jsonify(status=200)
