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25 lines
589 B
25 lines
589 B
# -*- coding: utf-8 -*-
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#
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from django.db import transaction
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def on_transaction_commit(func):
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"""
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如果不调用on_commit, 对象创建时添加多对多字段值失败
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"""
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def inner(*args, **kwargs):
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transaction.on_commit(lambda: func(*args, **kwargs))
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return inner
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class Singleton(object):
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""" 单例类 """
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def __init__(self, cls):
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self._cls = cls
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self._instance = {}
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def __call__(self):
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if self._cls not in self._instance:
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self._instance[self._cls] = self._cls()
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return self._instance[self._cls]
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