djangoget_or_create非线程安全

• Z时代
• 2024-01-10
• 分类：综合

背景

• get_or_create 存在并发问题,导致出现重复数据

处理方法

• 事务

分析

    def get_or_create(self, defaults=None, **kwargs):
        """
        Look up an object with the given kwargs, creating one if necessary.
        Return a tuple of (object, created), where created is a boolean
        specifying whether an object was created.
        """
        # The get() needs to be targeted at the write database in order
        # to avoid potential transaction consistency problems.
        self._for_write = True
        try:
            return self.get(**kwargs), False	#先查询，找不到则创建，存在并发问题。
        except self.model.DoesNotExist:
            params = self._extract_model_params(defaults, **kwargs)
            return self._create_object_from_params(kwargs, params)

处理方式:

from django.db import transaction
@transaction.atomic
def atomic_get_create_object(data=None):
    """
    :param data:
    :return:
    """
    obj, is_create = RunnerInfo.objects.get_or_create(**data)
    return obj, is_create

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