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60 lines
2.4 KiB
Python
60 lines
2.4 KiB
Python
"""
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Time: 2023/8/6 16:07
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Author: 公众号【布鲁的Python之旅】，【github】https://github.com/taskPyroer， 【gitee】https://gitee.com/hu_yupeng123/projects
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Version: V 0.1
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File:
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Describe: 公共基础model类
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"""
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import secrets
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import time
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from django.db import models
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from application import settings
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table_prefix = "sys_" # 数据库表名前缀
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class SnowflakeIDField(models.BigIntegerField):
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"""
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雪花id-生成16位
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"""
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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def generate_id(self):
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timestamp = int(time.time() * 1000)
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# 将时间戳缩小到合适的位数（例如，取后面的10位）
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timestamp = (timestamp - 1564454400000) % 10000000000
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return (timestamp << 6) # 使用6位表示时间戳，剩余10位可根据需要分配给机器ID和序列号
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def pre_save(self, model_instance, add):
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snowflake_id = self.generate_id()
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setattr(model_instance, self.attname, snowflake_id)
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return snowflake_id
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def generate_id():
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timestamp = int(time.perf_counter_ns()) # 获取纳秒级时间戳
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random_number = secrets.randbelow(10**4) # 生成一个4位随机数
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id = str(timestamp) + str(random_number).zfill(6) # 将时间戳和随机数拼接成ID，随机数左侧填充0
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return id
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class BaseModel(models.Model):
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"""
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基本模型,可直接继承使用，一般不需要使用审计字段的模型可以使用
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覆盖字段时, 字段名称请勿修改
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"""
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# id = models.BigAutoField(primary_key=True, default=generate_id, help_text="Id", verbose_name="Id")
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id = SnowflakeIDField(primary_key=True)
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creator = models.ForeignKey(to=settings.AUTH_USER_MODEL, related_query_name='creator_query', null=True,
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verbose_name='创建人', help_text="创建人", on_delete=models.SET_NULL,
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db_constraint=False)
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modifier = models.CharField(max_length=255, null=True, blank=True, help_text="修改人", verbose_name="修改人")
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update_datetime = models.DateTimeField(auto_now=True, null=True, blank=True, verbose_name='更新时间')
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create_datetime = models.DateTimeField(auto_now_add=True, null=True, blank=True, verbose_name='创建时间')
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class Meta:
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abstract = True # 表示该类是一个抽象类，只用来继承，不参与迁移操作
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verbose_name = '基本模型'
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verbose_name_plural = verbose_name
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